Provigil (Modafinil) is a medication used to treat excessive sleepiness caused by certain sleep disorders. These sleep disorders are narcolepsy, obstructive sleep apnea/hypopnea syndrome and shift work sleep disorders. Provigil has severalconcerning side effects such as chest pain, dizziness, difficulty breathing, heart palpitations, irregular and/or fast heartbeat, increased blood pressure, tremors or shaking movements, anxiety, nervousness, rapidly changing mood, problems with memory, blurred vision or other vision changes to name a few. Many drugs interact with Provigil which include over-the-counter medications, prescription medications, nutritional supplements, herbal products, alcohol containing beverages and caffeine. The use of Provigil needs careful supervision. Provigil may affect concentration, function or may hide signs that an individual is tired. It is recommended that until an individual knows how Provigil affects him/her, they may not drive, use machinery or do any activity that requires mental alertness.