DEPARTMENT OF HEALTH AND HUMAN SERVICES
FOOD AND DRUG ADMINISTRATION
CENTER FOR DRUG EVALUATION AND RESEARCH
PEDIATRIC ADVISORY SUBCOMMITTEE
OF THE ANTI-INFECTIVE DRUGS ADVISORY
COMMITTEE
SECTION 17, BEST PHARMACEUTICALS FOR CHILDREN ACT
ADVERSE EVENT REPORTING
Thursday, June 12, 2003
3:45 p.m.
Holiday Inn Gaithersburg
The Ballrooms
2 Montgomery Village Avenue
Gaithersburg, Maryland
PARTICIPANTS
Joan P. Chesney, M.D., Chair
Thomas H. Perez, R.Ph., M.P.H, Executive Secretary
VOTING CONSULTANTS
David Danford, M.D.
Susan Fuchs, M.D.
Richard Gorman,
M.D., FAAP
Stanley Ip, M.D.
Naomi Luban, M.D.
Judith O'Fallon,
Ph.D.
Don Mattison, M.D.
Robert Nelson,
M.D., Ph.D.
Thomas B,Newman,
M.D., M.P.H.
FDA
Diane Murphy, M.D.
Paul Andreason,
M.D.
Min Chen, M.S.
Mark Hirsch, M.D.
Solomon Iyasu, M.D.
Mary Parks, M.D.
Robert M. Stasko,
M.D.
C O N T E N T S
Call to Order:
Joan P. Chesney,
M.D. 4
Meeting Statement:
Thomas H. Perez,
R.Ph., M.P.H. 6
Adverse Event Reports, as per Section 17,
Best Pharmaceuticals for Children Act
Solon Iyasu, M.D. 7
Open Public Hearing
Sheila McDonald 33
Chair, Committee Final Comments 35
P R O C E E D
I N G S
Call to Order, Introductions
DR.
CHESNEY: We would like to start with
introductions because there are some new people at the table. It looks like the left side of the table is
depleted, so we will start at the right.
Dr.
Murphy, I don't know if you and Dr. Cummins need to introduce yourselves or we
can move on.
DR.
MURPHY: I think you can move on.
Solomon,
you need to introduce yourself.
DR.
IYASU: Good afternoon, My name is Solomon Iyasu. I am a team leader with the Division of
Pediatric Drug Development, pediatrician, epidemiology. I will be talking about adverse events today.
DR.
CHESNEY: Thank you. Continuing around the table?
DR.
CHEN: Hello. My name is Min Chen. I am Associate Director of the Office of Drug
Safety, CDER.
DR.
HIRSCH: I am Mark Hirsch. I am the medical team leader in urology.
DR.
PARKS: I am Mary Parks. I am the Deputy Director, Division of
Metabolic and Endocrine Drug Products.
DR.
FUCHS: Susan Fuchs, Pediatric Emergency
Medicine Physician, Children's Memorial Hospital, Chicago, a member of the
committee.
DR.
O'FALLON: Judith O'Fallon, statistician,
Mayo Clinic Cancer Center, Rochester, Minnesota.
DR.
LUBAN: Naomi Luban, pediatric
hematologist-oncologist, Director of Transfusion Medicine and Laboratories,
Children's Hospital and George Washington University School of Medicine, member
of the committee.
DR.
DANFORD: David Danford, Department of
Pediatrics, Joint Section of Pediatric Cardiology, University of Nebraska
Medical Center and Creighton University in Omaha.
DR.
NELSON: Robert Nelson, pediatric critical-care
medicine at Children's Hospital, Philadelphia.
DR.
CHESNEY: Joan Chesney, Division of
Pediatric Infectious Diseases at the University of Tennessee, Memphis Health Science Center.
MR.
PEREZ: Tom Perez, Executive Secretary to
this Committee.
DR.
GORMAN: Rich Gorman, pediatrician in
private practice in Ellicott City, Maryland.
DR.
MATTISON: Don Mattison, NICHD.
DR.
IP: Stanley Ip, Department of
Pediatrics, New England Medical Center.
DR.
ANDREASON: Paul Andreason, psychopharm
leader, Division of Neuropharmacological Drug Products, FDA.
DR.
STASKO: Robert Stasko, medical officer,
Division of Neuropharmacology.
DR.
NEWMAN: Tom Newman, Departments of
Epidemiology and Biostatistics and Pediatrics at UCSF.
DR.
CHESNEY: Thank you.
Mr.
Perez is going to read the conflict-of-interest statement for this meeting.
Meeting Statement
MR.
PEREZ: Thank you. The following announcement addresses the
issue of conflict of interest with respect to this meeting and is made part of
the record to preclude even the appearance of such at this meeting. All participants have been screened for
interests related to the product to be discussed, their sponsors' competing
products and their sponsors.
In
accordance with 18 U.S.C. 208(b)(3), the following participants have been
granted waivers that permit them to participate in the discussions; Dr. Joan
Chesney for owing stock in the sponsor of Zoloft and Lipitor, value between
$52,000 and $100,000 and for owing stock in a firm that makes a competing
product to Zoloft. The stock is valued
from $5,001 to $25,000.
Dr.
Richard Gorman for owing stock in the parent company of the sponsor of
Ditropan. The stock is valued between
$50,000 and $1.00 to $100,000.
In
the event that the discussions involve any other products or firms not already
on the agenda for which an FDA participant has a financial interest, the
participants are aware of the need to exclude themselves from such involvement
and their exclusion will be noted for the record.
With
respect to all other participants, we ask, in the interest of fairness, that
they address any current or previous financial involvement with any firm or
product they may wish to comment upon.
Thank
you.
DR.
CHESNEY: Thank you.
Our
main speaker for this afternoon is Dr. Solomon Iyasu. He is going to discuss the adverse-event
reports for four drugs, I understand.
Adverse Event Reports
DR.
IYASU: Good afternoon.
[Slide.]
I
know this is very late in the day. I
will try to make it as painless as possible.
In the next hour and a half, I will be presenting to you the one-year
post-exclusivity adverse-event review for four drugs.
As
you recall, I presented preliminary data for Zoloft in the last meeting. Today, I will present the review of full year
adverse-event reports of Zoloft and Ditropan and preliminary results for Zocor
and Lipitor.
[Slide.]
As
you well know, reviewing and reporting the reports for the Pediatric Advisory
Subcommittee is mandated by Section 17 of the BPCA. We discussed this during our last meeting.
[Slide.]
Sertraline,
or Zoloft, was granted exclusivity on February 1, 2002. It is a selective serotonin-reactive
inhibitor. In adults, it is indicated
for the treatment of major depressive disorder or CV panic disorder,
post-traumatic disorder, premenstrual disorder, social anxiety disorder. In children, it is indicated for the
treatment of obsessive-compulsive disorder in age six years and older.
[Slide.]
How
frequently is this drug being used? To
answer this question, I will present data from two data sources; the IMS Health
or National Prescription Audit Plus which provides data on projected frequency
of dispensed prescriptions by retail pharmacies. Data is gathered from a sample of 22,000
randomly selected pharmacies in the U.S.
The pharmacies in the sample represent about 40 percent of the pharmacy
stores and approximately 45 percent of prescription coverage.
The
second database is National Disease and Therapeutic Index which provides
projected frequency of total mentions or appearances during patient visits to
the office-based practice. The data are
gathered from a panel of 2,000 to 3,000 office-based physicians in the
Continental U.S.
A
drug mention can result from a prescription written, a refill authorized, a
sample given, the drug administered in the office and so on or any combination
of these.
[Slide.]
Data
from the NPA Plus indicates that total dispensed prescriptions for all ages
increased from 21 million in 1998 to 31 million in 2002. Family medicine, internal medicine and
psychiatry were the top three specialties prescribing Zoloft in and accounted
for most of the increase during this time period.
The
pediatric specialty were responsible for close to 400 dispensed prescriptions
during 2002. Frequency of Zoloft
mentions during patient visits to office-based practice increased slightly
between 2000 and 2002 in children zero to sixteen years of age.
Two
thirds of the mentions were in adults and children. Zoloft was used more in male children than
females while the opposite is true in the adult population. In 2002, there were close to 700,000 drug
mentions in all pediatric-aged children representing about 8 percent of total
Zoloft mentions or appearances.
[Slide.]
There
are very important limitations of drug-use databases. NPA Plus did not provide, for example,
demographic information and NDTI projections can be unstable due to small
sample size when use of a drug is less prevalent.
[Slide.]
Before
I go into the actual review of the adverse events reported for this product, I
would like to dwell a little bit on the adverse events limitations and the
limitations of the database that we have at FDA.
Oh;
I think have a different slide here.
This is the labeling information which you have. Do you have it in the packet? I understand that the labels are in the
package so this is a summary of what the label says regarding pediatric
information. Adverse events are
generally similar to those seen in adults and the other adverse events in
pediatric patients included hyperkinesia, twitching, fever and so on as
indicated on this slide.
In
the precaution section of the label, there is mania, hypomania, weight loss,
risk of seizure and suicide mentioned as precautions in the Precaution
Section. In the Pediatric Section, there
is information about decreased appetite and weight loss from studies that were
done in the pediatric population and
recommendations to do regular monitoring
of weight and growth for children who are taking this medication.
[Slide.]
Let
me dwell, then, on the adverse-event reporting system and its important
limitations before I go into the actual review.
AERS is a spontaneous and voluntary system as opposed to an active
surveillance system. Therefore,
underreporting adverse events is an important limitation. The
extent of underreporting may vary by drug and length of time a drug has been in
the market. Another limitation is
reporting bias. There tend to be more
reports, for example, for new drug entities which have just come into the
market. Often the quality of the reports
is poor and in conflict which makes is very difficult to adequately assess the
relationship between the event and the suspect drug.
There
are no real numerators or denominators and, therefore, it is not possible to
estimate the true incidence rate of events or exposure or risk. Numerators are ascertained. Denominators can only be projected for many
of these drugs. Unlike in clinical
trials, they are one kind of reliably estimated risk because there are no
control groups to compare to.
It
may be a good signal generator or detector for rare unlabeled serious adverse
events. However, it is poor at detecting
the depth and strength of the signal especially when the background rate of an
event is high or unknown. The veracity
of a causal attribution based on the AERS data is often questionable. It is soft data at best, but often that is
all we have.
So,
with that introduction to the AERS database, let me go to the actual report.
[Slide.]
Let
me turn to this report, the one-year report, that is on the table here. When looking at this table, the numbers are
not going to add up for two reasons.
First, the totals in the first row include reports with unknown age. Second, these counts may include duplicate
reports. Fortunately, duplicates are
easy to sort out by a careful review.
The numbers in parentheses on this table are adverse-event reports from
the U.S. alone.
Therefore,
the AERS search for the one year after granting exclusivity generated a total
of 1,249 reports worldwide of which 847 were from the U.S. alone. Among pediatric-age patients, there were 51
adverse-event reports of which 40 were serious and five were reports of
death. While the pediatric deaths is a
duplicate report upon hand review, minor review; that is, having four
unduplicated pediatric deaths in the final analysis
[Slide.]
Adverse-event
reports are categorized according to preferred terms. This slide presents the top ten most
frequently reported adult and pediatric adverse events in decreasing frequency
of occurrence. Note that adverse events
not previously described or not on the label are marked by an asterisk. This includes, for the pediatric patients,
maternal drugs affecting the fetus, complication of maternal exposure and
memory impairment.
[Slide.]
I
would like to turn my attention to the demographics of the 49 unduplicated
pediatric adverse-event reports for the one-year after exclusivity. Looking at the age distribution, there were
nine reports among infants less than one month old. All the reports under one month old can
loosely fall under the category of maternal exposures of the fetus. A little less than half of the reports were
in children older than twelve years. 21
were in females and 27 in males.
[Slide.]
Based
on the predominant adverse events reported in each case, the 49 pediatric cases
could generally be summarized in the following five categories. However, it must be emphasized that most
reports involved more than one drug and possible confounding by underlying
medical disorders.
There
were thirteen patients with psychiatric events most commonly characterized by
aggression, hostility or hallucinations.
Ten patients had neurologic events.
Most of the events, however, were extrapyramidal movement
disorders. There were 13 cases with
congenital events in the context of exposure by maternal use. These included congenital malformations and
neonatal withdrawal syndromes.
[Slide.]
There
were nine patients whose adverse events were due to either an overdose or
accident or intentional medication error or suicide. Five nonfatal overdoses, of which three cases
were accidental ingestions, two were intentional overdoses in adults and
children. Of the three fatal cases, two
completed suicides and one case was an accidental toxicity.
There
were four other cases that cannot fit into any category. So this is, in general, putting them into
different adverse-event profiles.
[Slide.]
An
examination of outcomes revealed, as I said before, four unduplicated pediatric
deaths. There were nineteen
hospitalizations and 26 that were life-threatening or required interventions or
medically important events.
Just
a reminder, there is a regulatory definition for what a serious adverse event
is. It is defined as any adverse drug
experience occurring at any dose that results that in any of the following
outcomes; a death, a life-threatening adverse drug experience, an in-patient
hospitalization or prolongation of existing hospitalization, a persistent or
significant disability, incapacity or a congenital anomaly or birth defect.
[Slide.]
Let's
turn to the diagnosis or indication for use recorded in the adverse-event case
reports. The commonest indication for
use is depression in sixteen patients.
You will recall that Zoloft is not approved for depression. It is approved for OCD.
Although
few, it appears that it was also used for ADHD, OCD, vocal-cord disorder,
stress emotional disorder, anxiety and adjustment disorder. There were a large number of in utero
exposures. We also had several for which
indication for use was either accidental or unknown.
[Slide.]
Let
me discuss the cases that led to the four deaths. A premature baby born to an HIV-positive
mother who was using Zoloft and multiple other meds during pregnancy. The baby died after developing pneumothorax
and septic shock. The death was probably
unrelated to Zoloft in this case. I am
just presenting the summary.
[Slide.]
Patient
No. 2, an adolescent child committed suicide following a one-week trial of
sertraline for depression. The patient
remained significantly depressed during therapy. This report is an update provided during 2002
to an initial report that was provided to FDA in 1997. Two
days ago, the sponsor provided us additional information regarding this patient
which became available as a result of litigation. The information suggests the patient
exhibited serious behavioral and emotional problems including anger,
aggression, social withdrawal, suicide ideation for the six months prior to
initiation of therapy or also to the event.
As
a known suicide risk in major depressive disorder is labeled and there is a
Precautions Section of the drug label.
The information to date, including what we got recently, is suggestive
of the event being related to the underlying condition of depression. The role of sertraline, if any, is unclear in
this case.
[Slide.]
This
report is from a relative of the deceased.
An adolescent child committed suicide after using Zoloft without
prescription about six times during the ten-year period. The intention was to get high. He was introduced to Zoloft by a student ten
days prior to the event. There was no
prior history of depression. However,
the patient reportedly had hallucinations the night before and, on the morning
of the event, it is also reported that the patient stayed home due to fever
that morning. This is probably a
drug-abuse situation with a possible overdose although there was no information
in the case report about dose.
So
it is unclear if sertraline is causally related to this death or not.
[Slide.]
I
just want to bring to your attention, which is on the label, Zoloft label and
suicide risk Precaution Section, the possibility of a suicide attempt is
inherent in the major depressive disorder and may persist on until significant remission occurs. Close supervision of high-risk patients
should accompany the initial therapy.
Prescriptions for Zoloft should be written for the smallest quantity of
tablets consistent with good patient management in order to reduce the risk of
overdose.
[Slide.]
In
summary, most of the pediatric events involve multiple drug exposures, had
confounding medical disorders, generally were similar to adult events and most
were labeled or previously described events except maternal drugs affected the
fetus, complications of maternal exposure and memory impairment. Even memory impairment can probably be the
same as concentration impairment.
There
were two suicides in adolescents, one with a history of depression and the
other without a history of depression.
The causal relationship between these two events is unclear.
[Slide.]
So
the question that we would like to pose to the committee is any feedback on
this report because, although there were 49 unduplicated reports, there was
little to suggest that this was causally related to the drug. So I invite any comments and questions or
clarifications on this product and this report.
[Slide.]
I
would like to acknowledge Carol Pamer, Laura Governale for their contributions
because they did most of the safety review.
DR.
CHESNEY: Dr. Nelson?
DR.
NELSON: The 392,000 prescriptions in the
past year, I assume, is just the number of prescriptions. I guess two questions; A, what is the capture
of that particular database relative to national usage and, B, can one take
that and at least divide by 30, since most plans only give you 30 pills per
prescription, at least to get a relative number, at least a low number, of the
number of actual people behind those prescriptions as opposed to number of
prescriptions?
DR.
IYASU: They used data that I mentioned
comes from the pharmacy data which is really dispensed prescriptions. It doesn't necessary apply to use. It covers only about 40 percent of the
pharmacies in the country and 45 percent, I think, of the prescriptions. So, if you were to try to calculate how many
tablets, it would be difficult, probably, from this database.
DR.
NELSON: But, at least from that, you
could at least double it to get an idea of national usage, at least roughly.
DR.
IYASU: I am not sure that you can do
that. I don't know what the accuracy or
validity of doing that would be because I haven't really calculated. We don't have a national database that
covers--so there really is a comparison that we do. But you can have a rough calculation and put
some confidence limits around that and see how good the estimates are.
I
haven't done it so I can't give you a straightforward answer.
DR.
CHEN: I think Dr. Nelson's question was
about person-year calculation to get an estimate of the exposure. The data we have, the prescription data, is
already in a projection so we can get that rough estimate again as far as
person-year exposure data to be used as a denominator if we want to calculate
anything. Right?
DR.
NELSON: I guess that is a more
sophisticated way of stating my question.
DR.
CHEN: Maybe Laura would like to add a
little bit more about drug use data specifics.
DR.
GOVERNALE: As Dr. Iyasu stated
previously, what we are getting from the National Prescription Audit is the
number of prescriptions from the pharmacy databases. This number is projected to the national
level so the numbers that were quoted are the nationally projected estimates of
prescription volume.
DR.
CHESNEY: Dr. Danford, you were next.
DR.
DANFORD: I am interested in the thirteen
either birth defects or fetal problems that came to light. Was there a particular pattern among those
that you could recognize as a specific problem with the drug?
DR.
IYASU: Among the four cases of
malformations which were all related to maternal exposure, we could not
establish any causal relationship. But
there were two cardiac defects, one limb reduction and then there was another
face anomaly.
Given
that we have some information about the effect of this drug on birth defects,
there are no human studies to suggest that there is an effect of that kind,
unexpected. But, again, the AERS
database is not the best place to try to establish some causal
relationship. But, from the human
studies, there is no signal that suggests that there are birth-defect effects
from the drug.
DR.
CHESNEY: Dr. Luban?
DR.
LUBAN: I presume that the drug is
contraindicated in pregnant women?
DR.
IYASU: Right. It is contraindicated and that risk and
benefit has to be weighed before this drug is given to pregnant women but it
has not been studied in pregnant women.
DR.
CHESNEY: Dr. Gorman.
DR.
GORMAN: We have approved many drugs, or
BPCA has approved many drugs. How were
these four drugs selected for our review today?
DR.
IYASU: The law states that we have to
provide a review of all the drugs that have gotten exclusivity. The selection in based on the dates on which
these drugs have gotten their exclusivity determination done. If they were given on a certain date, then
they are put on the list. So, on the
anniversary of that granting of the exclusivity, then we are obliged to provide
that review within three months or so, depending on how extensive the review is
So
that is how they come into the picture.
Two of these drugs, for example, were approved in February and the
statins were approved on February 22, two of them. So all four of them have completed their one
year plus the time that we need to review the data. That is how they got selected into the
presentations this time.
DR.
CHESNEY: I don't see any other
questions. Should we go ahead,
then?
DR.
MURPHY: Our neuropharm representatives
are leaving so this is your last chance, ladies and gentlemen, before they
depart, if you have any more questions about Zoloft. I just wanted to point that out. Okay.
Sorry,
guys. I just wanted to make sure they
understood that you would not be staying around.
DR.
GORMAN: One more question. Is this pattern of neonatal withdrawal
syndrome seen with the other agents that we are not getting reported on today,
and the same thing with the facial abnormalities and limb-length
discrepancies. Is that when you look at
all the selective serotonin reuptake inhibitors, that looks more convincing
than just with Zoloft alone?
DR.
ANDREASON: If I heard you correctly, you
said the withdrawal syndromes or the discontinuation?
DR.
GORMAN: The neonatal discontinuation.
DR.
ANDREASON: The neonatal
discontinuation. Pretty much with the
neonatal discontinuation syndromes, they seen to be fairly constant across the
group with some hint that the longer half-life SSRIs are not showing as many
cases. But, again, it is hard to tell
because this is an AERS database. There
are cases reported kind of across the board.
Whether these represent discontinuation or toxicity followed by
discontinuation is, at this point, difficult to say because sometimes symptoms
are showing directly after birth which would not give an adequate amount of
time for the drug to wash out and have that be a withdrawal or a
discontinuation syndrome.
As
far as the cranial-facial abnormalities, I am not sure on that one. I would assume that they are. Is Andy here?
Andy, could you speak to the cranial-facial abnormalities?
DR.
ANDREASON: This is Andy Mosholder who
reviewed many of these drugs. He is with
the Office of Drug Safety now.
DR.
MOSHOLDER: Off the top of my head, I am
not sure I can contribute anything about cranial-facial anomalies with
SSRIs. I think fluoxetine has been the
best studied in the literature and there hasn't been any association
established in terms of congenital anomalies to date that I am aware of. But I am not sure of the others in the class
have been studied to the same extent at this point in time.
DR.
IYASU: Thank you.
[Slide.]
My
second talk is a review of the adverse-event reports involving oxybutynin or
Ditropan.
[Slide.]
Ditropan
was granted exclusivity on February 3, 2002 and is an antispasmodic and
anticholinergic agent. In adults, it is
indicated for the treatment of bladder irritability associated with voiding in
patients with an inhibited neurogenic bladder.
In children, Ditropan is indicated for the treatment of detrusor muscle
overactivity in association with a neurogenic condition such as spina bifida.
The
tablet in syrup are approved in children five years or older and the
extended-release form is for ages 6 and older.
[Slide.]
Drug-use
data for 1998 to 2002 shows that total dispensed prescriptions increased from
3.5 million in '98 to 6.5 million in 2002 in all ages. The oral form was the predominant form
dispensed. Urology and internal medicine
were the two top specialists responsible for most prescriptions.
The
pediatric specialty accounted for about 82,000 dispensed prescriptions during
2002.
[Slide.]
The
frequency of drug mentions or appearances during pediatric patient visits in
office-based practice decreased to 82,000 down from 138 in 2002 and 105 in
2000. Children between the ages of two
and eleven represented over 70 percent of the use. Overall, the use was much higher in females
than males in pediatric and adult patients.
However, there were gender and age differences in the leading
indications for use.
In
males age two to eleven years, the leading indications were frequency of
urination and polyuria. In age twelve to
sixteen, it was for incontinence of urine.
In females age two to sixteen years, the leading indications were other
bladder dysfunction such as hyperactive bladder, paralysis of bladder or
neurogenic bladder.
[Slide.]
In
the office-based setting, the top three physician specialties prescribing
Ditropan were urology, pediatrics and nephrology.
[Slide.]
During
the year following exclusivity, there were a total of 40 adverse-event reports,
five of which were in pediatric patients.
All the pediatric events had serious outcomes. There were no pediatric deaths.
[Slide.]
This
slide shows the ten most frequent adverse-event reports listed in decreasing
order of frequency. Adverse events not
previously described or not on the label are marked by an asterisk. In adults, the drug being ineffective was the
most common reported events. This is
unlabeled. In pediatric patients,
although several reported events are not labeled such as depression,
hallucinations, panic reaction, abnormal behavior, anger, anxiety,
aggression. However, the number of
events are just too few and uninterpretable.
[Slide.]
However,
when we looked at the reports from the drug-approval date which was 1975 to
March 19, 2003, there were 745 adults and 74 pediatric reports. This slide shows the unlabeled events only. In adults, the most common, again, was drug
ineffective. Other events were pruritus
and the condition aggravated.
There
were also unlabeled events in pediatric patients, several of which are
psychiatric events such as personality disorder, thinking abnormal, agitation
and so on. But, again, the numbers were
not that great. We did not do a detailed
analysis in review of the case reports since '75.
[Slide.]
The
five reports for the post-exclusivity period were in patients between the ages
of two and eleven years of age. Two were
female and three were male. The
administered doses ranged from 5 to 37.5 milligrams per day.
[Slide.]
This
slide shows the diagnosis for which Ditropan was used as recorded in the case
reports, one each for enuresis, nocturnal enuresis, neurogenic bladder and
detrusor muscle spasms. There was no
information for one patient.
[Slide.]
I
will briefly discuss each of the five pediatric reports. A school-age child in Ditropan and
Desmopressin, which is a synthetic antidiuretic hormone agonist, was used in
the treatment of primary nocturnal enuresis.
The patient was hospitalized with low osmolality, hyponatremia, weight
gain which mostly may have been the effects of the Desmopressin.
There
were three medically significant events.
A school-age child on Ditropan had a seizure after taking Benadryl. The patient was treated in the ER and
Ditropan was resumed. The patient is
seizure free.
Next
was a fragile preschool-age child with a history of tracheostomy,
ventricle-peritoneal shunt on Ditropan syrup via G tube. The patient became unconscious and Ditropan
was discontinued. The only other
information we have is the catheterization increased from four to six times a
day during therapy.
[Slide.]
The
next case is a preschool child born with brain damage who developed behavioral
and psychiatric events after six to twelve months of treatment with Ditropan
for bed wetting. After Paxil was added,
the patient became violent and a danger to one's self and others and developed
personality changes. Paxil was
discontinued and resumed at half dose after the patient became depressed and
suicidal. The symptoms improved but the
bed wetting persisted.
The
patient was put on Detrol and Paxil following which Ditropan was discontinued
and eventually bed wetting improved as the patient matured.
[Slide.]
The
next case is an anxious school-age child put on Ditropan for nocturnal enuresis
but developed several psychiatric symptoms.
The patient was put on Atarax and Ditropan was discontinued after a
month.
[Slide.]
In
summary, all the five pediatric reports had serious outcomes. However, several adverse-event terms were
unlabeled as indicated before. Most of
the psychiatric events primarily were reported from the two patients with
possible underlying psychiatric conditions.
The pediatric events cannot be solely attributed to Ditropan use because
of concomitant drug use, possible overdosing or confounding medical conditions.
Once
again, the limitations of the AERS data makes attribution of causality very
difficult when one is considering the clinical question of did the suspect drug
cause the event. From an epidemiologic
standpoint, causality is a public-health question that requires a
population-based approach to adequately answer the question.
Postmarketing reports are limited in this aspect unless you have a large
number of signals.
[Slide.]
The
question, then, to the committee is, because of the small number of reports
that we have for the one year, should we consider an additional one year of
AERS follow up.
DR.
MURPHY: This applies to both products,
we are asking this.
DR.
CHESNEY: Would anyone feel strongly that
we should not ask for an additional year of follow up? In other words, we would ask for another year
of follow up. I think everybody agrees
that we would like an additional year of follow up for both drugs.
DR.
IYASU: Okay. Thank you.
Any comments or questions? Let
me go to the next one.
[Slide.]
My
last presentation is a review of adverse events of simvastatin or Zocor, events
that were reported to the FDA during the one year after pediatric exclusivity
was granted.
Exclusivity
for this drug was granted on February 22, 2002. Simvastatin is a lipid-lowering agent. In adults, it is approved for use in coronary
heart disease with hypercholesteremia.
In children, it is indicated for the treatment of heterozygous familiar
hypercholesterolemia as an adjunct to diet to reduce total cholesterol,
low-density lipoproteins and Apo B levels in boys and postmenarchal girls age
ten to seventeen years.
This
condition occurs at the prevalence rate of 1 in 500 and is associated with an
increased risk of premature coronary heart disease in adulthood. Adjunct therapy is used if, after the adequate
trial of dietary therapy, LDC-C remains equal to or more than 190 milligrams
per deciliter or it is equal to more than 160 milligrams per deciliter and a
family history of premature heart disease or two or more CVD risk factors are
present.
[Slide.]
Based
on data from NPA Plus, total dispensed prescriptions for Zocor have increased
from 18.5 million in 1998 to 28.8 million in 2002 for all ages.
[Slide.]
In
2002, there were a projected 4,000 drug mentions or appearances in office-based
practice for the pediatric age group zero to sixteen years of age. There were no mentions of this drug during
2000 and 2001. Hyperlipidemia was the
lead indication in this setting.
[Slide.]
Now,
counts of adverse events during the year after exclusivity shows that there
were a total of 1,309 reports in all ages including domestic and foreign
sources. Most were in adults. There were eight reports in the pediatric age
groups. However, a careful of review of
the case reports revealed four of the age reports were in adults. That is leaving four pediatric reports for
review. One of the four was a pediatric
death.
[Slide.]
Today,
I will only present a summary preliminary review of the pediatric cases. This is really a preliminary report. There were four unlabeled and unduplicated
events with serious outcomes including one death. However, the number of reports are too few
again for a meaningful interpretation.
All the pediatric events reported to FDA were from foreign sources.
Preliminary
review indicates that the events cannot be solely attributed to Zocor use. Two cases were exposed in utero. Both were delivered by C-section because of
fetal distress. The first case was
exposed to Zocor in the first trimester only.
There were no other concomitant maternal medications. The baby is a healthy, normal weight term
baby.
The
second in utero exposure involved multiple concomitant maternal medications,
prematurity and resulted in postnatal death from complications of
prematurity. The rest of the pediatric
reports had concomitant medications and confounding medical conditions. As I stated earlier, the reports are too few
and the causal link to Zocor cannot be made from the available information for
any of the events I discussed above.
[Slide.]
The
question for the committee, again, is because of the small number of reports
and relatively low pediatric use, should we consider then an additional year of
AERS follow up.
DR.
CHESNEY: Can I speak for the rest of the
committee and say we would appreciate another year of follow up.
DR.
IYASU: Thank you.
Let
me go to the last report
[Slide.]
The
next drug is Lipitor. It was granted
exclusivity on February 22, 2002, the same day as Zocor. I will get you out of here in five
minutes. The label for the drug is in
your package. The approved indications
in adults and children are summarized on this slide and they are similar to
what it is for Zocor.
[Slide.]
The
next two slides are the use data for Lipitor.
The total dispensed prescriptions for Lipitor are increasing, 24.8
million in '98 to 65.7 million in 2002.
[Slide.]
Frequency
of drug mentions for pediatric patients in office-based settings are also
increasing from 9,000 in 2000 to 14,000 in 2002. Pediatric use represents less than 1 percent
of all Zoloft mentions during the year.
The most common indication, again, is hypercholesterolemia.
[Slide.]
During
the one year after exclusivity was granted, there were a total of 966
adverse-event reports. However, there
were no pediatric reports during the year so I have nothing to report.
[Slide.]
I
would ask the same question now as for the other drug.
DR.
CHESNEY: We would like more information.
DR.
IYASU: Thank you.
DR.
CHESNEY: Thank you very much. This brings us to the open public hearing.
Open Public Hearing
DR.
CHESNEY: I understand that nobody has
signed up for the open public hearing.
Is there anybody from the public who would like to speak? Yes? I
think the time is generally about three to five minutes.
MS.
McDONALD: My name is Sheila McDonald. I am a Member of the Board of Directors of
the Child and Adolescent Bipolar Foundation.
Ms. Judith Cornelius is also a member of the Board of Directors of the
Child and Adolescent Bipolar Foundation which is a national organization of
12,000 families raising children with bipolar disorder.
As
you can imagine, our mission is to educate families, professionals and the
public about early-onset bipolar disorder and to advocate for increased
research on the nature, causes and treatment of bipolar disorders in children.
Parents
report that before diagnosis, serious adverse drug reactions have
occurred. These parents report to us on
our website constantly and they have reported that, as a result of single
drug-therapy treatment with SSRIs alone, there have been adverse events. Whenever there are adverse events reported to
us, we ask that they send it to the formal system.
However,
many families report that, as an adjunct to appropriate treatment with new
stabilization therapy, SSRIs can be an important tool in helping to improve the
quality of our children's lives. So we
feel, importantly, that clinicians and families need this important safety data
to help guide appropriate use of these and other medications and we urge
increased attention to safety studies in children and to improve the adverse
drug-event reporting system. We are
hopeful that the SSRIs will be continued to be looked at as an adjunct to
appropriate treatment.
Thank
you.
DR.
CHESNEY: Thank you. Would anybody from the agency like to
respond?
DR.
MURPHY: No, except to say that we will
continue to be looking at the SSRIs.
Chair/Committee Final Comments
DR.
CHESNEY: I think that brings our
afternoon open session to a close. Is
that correct? Would you all like to make
final remarks? I would like to thank Dr.
Iyasu and your colleagues for doing all this follow-up information for us. I think, even though we are not represented
by very many here, it is very, very important information. So we really appreciate all the effort you
all have put into it.
DR.
MURPHY: I think any feedback from the
group--I think one of the things we are going to have to do is not have it at
the very last, which we tend to. I think
that is probably one of the things I would begin to suggest we change a little
bit. Any suggestions from the committee
on how to make it more useful to them, again, in the context that we have
limited resources. You saw our one
safety person is dedicated totally to peds, so we have many people who have
also assisted and cooperated, and help us.
Office of Drug Safety has committed significant time and effort to this.
Knowing,
within that context, we just don't have unlimited resources. If there is any other way that we can make
this more useful, we would like to hear from you.
DR.
CHESNEY: I think, in a very pragmatic
sense, it would be nice to get this information before we come and particularly
to have the pediatric adverse effects that have been reported, everything about
the pediatric use in the drug insert highlighted. It took me a while to find the Zoloft
information. If that was highlighted and
if it were possible to get the report you just gave us beforehand, so we could
be formulating questions and absorbing it better than at the end of the day.
I
would agree with you, Diane, maybe it would be possible to do it early in the
session or in the middle of a session or take time out to do it because I do
feel badly that there are not more people here to hear it. But I am also glad that there is nothing that
we--it sounds like there is nothing we need to be particularly alarmed about
this time.
DR.
MURPHY: We, again, would like to say
thank you very much to everybody, and particularly to you guys and ladies that
hung in here to the very end.
DR.
CHESNEY: We understood there was a
limousine to take us if we stayed later.
Thank you all, very much, for all the work that you did as background
information. We just have a very, very
easy job compared to what you do and so thank you very much for all you do.
[Whereupon,
at 4:39 p.m., the meeting was adjourned.]