You should not use this medication if you are allergic to modafinil or armodafanil (Nuvigil).
Before using modafinil, tell your doctor if you have angina (chest pain), liver or kidney disease, a heart problem, a history of drug addiction, if you take blood pressure medication, or if you have recently had a heart attack.
Modafinil affects the central nervous system. This can cause effects that may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be alert. Avoid other dangerous activity until you know how this medication will affect your level of wakefulness.
Stop taking modafinil and call your doctor if you have a skin rash, no matter how mild. A medicine similar to modafinil has caused severe skin reactions serious enough to require hospitalization. Other signs of a severe reaction include fever, sore throat, headache, and vomiting with a severe blistering, peeling, and red skin rash.
There may be other drugs that can interact with modafinil. Tell your doctor about all your prescription and over-the-counter medications, vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start a new medication without telling your doctor.