Hi, I did some research in MICROMEDEX, a drug reference.

• This preparation may contain one or more substances that are restricted in certain sports; competitors should check with the appropriate sports authorities.

• Improves daytime wakefulness in people with uncontrollable sleepiness caused by narcolepsy or sleep apnea. Also used in people who are sleep deprived from working odd hours such as a night shift.

Brand Name(s):Provigil
There may be other brand names for this medicine.

When This Medicine Should Not Be Used:
You should not use this medicine if you have had an allergic reaction to modafinil.

Make sure your doctor knows if you are also using dextroamphetamine (Adderall®, Dexedrine®), itraconazole (Sporanox®), ketoconazole (Nizoral®), methylphenidate (Ritalin®), or rifampin (Rifadin®, Rimactane®). Tell your doctor if you are using blood thinners such as warfarin (Coumadin®), or an MAO inhibitor such as Marplan®, Parnate®, Nardil®, or Eldepryl®.
Your doctor should know if you are also using medicine for depression such as clomipramine or desipramine, or medicine for seizures such as carbamazepine, phenobarbital, or Tegretol®.
Talk to your doctor if you are also using cyclosporine (Neoral®, Sandimmune®), diazepam (Valium®), phenytoin (Dilantin®), propranolol (Inderal®), or triazolam (Halcion®). Your dosages of these medicines may need to be adjusted if you use them together with modafinil.
Birth control pills, implants, shots, or an IUD may not work while you are using modafinil. To keep from getting pregnant, use another form of birth control while you are using this medicine and for one month after your last dose. Other forms of birth control include condoms, a diaphragm, or contraceptive foam or jelly.
Do not drink alcohol while you are using this medicine.
Warnings While Using This Medicine:

Make sure your doctor knows if you are pregnant or breast feeding, or if you are planning to become pregnant.
Tell your doctor if you have high blood pressure, kidney disease, or liver disease. Tell your doctor if you have a history of mental illness or drug abuse.
Make sure your doctor knows if you have heart rhythm problems, mitral valve prolapse, or have recently had chest pain or a heart attack.
Until you know how this medicine affects you, avoid driving, using machines, or doing anything else that requires you to be alert.
This medicine is not for use with occasional sleepiness that has not been diagnosed as caused by narcolepsy, sleep apnea, or shift-work sleep disturbance.
Your doctor will need to check your progress at regular visits while you are using this medicine. Be sure to keep all appointments.
This medicine may be habit-forming. If you feel that the medicine is not working as well, do not use more than your prescribed dose. Call your doctor for instructions.
Possible Side Effects While Using This Medicine:
Call your doctor right away if you notice any of these side effects:

Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing.
Chest pain.
Fast, slow, pounding, or irregular heartbeat.
Feeling unusually agitated, aggressive, confused, or excited.
Numbness, tingling, or burning pain in your hands, arms, legs, or feet.
Severe nausea, vomiting, or diarrhea.
Tremors or shaking.
Unusual bleeding, bruising, or weakness.
Unusual thoughts or behavior.
If you notice these less serious side effects, talk with your doctor:

Anxiety, nervousness, trouble sleeping.
Back pain.
Headache.
Nausea, diarrhea, upset stomach, loss of appetite.
Runny or stuffy nose, dry mouth, sore throat.