MedlinePlus Medical Encyclopedia: Overdose

Skip navigation


Medical Encyclopedia
Other encyclopedia topics:	A-Ag Ah-Ap Aq-Az B-Bk Bl-Bz C-Cg Ch-Co Cp-Cz D-Di Dj-Dz E-Ep Eq-Ez F G H-Hf Hg-Hz I-In Io-Iz J K L-Ln Lo-Lz M-Mf Mg-Mz N O P-Pl Pm-Pz Q R S-Sh Si-Sp Sq-Sz T-Tn To-Tz U V W X Y Z 0-9

Overdose

Contents of this page:
Definition Information	References

Definition

An overdose is when you take more than the normal or recommended amount of something, usually a drug. An overdose may result in serious, harmful symptoms or death.

If you take too much of something on purpose, it is called an intentional or deliberate overdose.

If the overdose happens by mistake, it is called an accidental overdose. For example, a young child may accidentally take an adult's heart medication.

Your doctor may refer to an overdose as an ingestion. Ingestion means you swallowed something.

An overdose is not the same as a poisoning. Poisoning occurs when someone or something (such as the environment) exposes you to dangerous chemicals, plants, or other harmful substance without your knowledge.

Information

An overdose may be mild, moderate, or serious. Symptoms, treatment, and recovery depend on the specific drug involved. For more information see:

The National Poison Control Center (1-800-222-1222) can be called from anywhere in the United States. It is a free and confidential service. You should call if you have any questions about an overdose, poisoning, or poison prevention. It does NOT need to be an emergency. You can call for any reason, 24 hours a day, 7 days a week.

See: Poison control center - emergency number

References

Ford MD. Clinical Toxicology. 1st ed. Philadelphia, Pa: WB Saunders; 2001.

Marx J. Rosen’s Emergency Medicine: Concepts and Clinical Practice. 6th ed. St. Louis, Mo: Mosby; 2006.

Update Date: 5/16/2007

Updated by: Eric Perez, MD, Department of Emergency Medicine, St. Luke's-Roosevelt Hospital Center, New York, NY. Review provided by VeriMed Healthcare Network.

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. Copyright 1997-2008, A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.