Your doctor should check your progress at regular visits to make sure that this medicine is working properly. Your blood pressure may need to be checked more often while taking this medicine.
It is important to tell your doctor if you become pregnant. Your doctor may want you to join a pregnancy registry for patients taking this medicine.
Serious skin reactions can occur with this medicine. Stop using this medicine and check with your doctor right away if you have blistering, peeling, or loosening of the skin; red skin lesions; severe acne or skin rash; sores or ulcers on the skin; or fever or chills while you are using this medicine.
This medicine may cause you to have a serious type of allergic reaction called anaphylaxis. Anaphylaxis can be life-threatening and requires immediate medical attention. Stop taking this medicine and call your doctor right away if you have a skin rash; itching; hives; hoarseness; trouble breathing; trouble swallowing; or any swelling of your hands, face, or mouth while you are using this medicine.
This medicine may cause serious allergic reactions affecting multiple body organs (e.g., heart, liver, or blood cells). Stop using this medicine and check with your doctor right away if you have the following symptoms: chest pain or discomfort, fever and chills, dark urine, headache, rash, stomach pain, unusual tiredness, unusual bleeding or bruising, or yellow eyes or skin.
If you think modafinil is not working properly after you have taken it for a few weeks, do not increase the dose. Instead, check with your doctor.
If you are using a medicine for birth control (such as birth control pills, implants, shots, patches, vaginal rings, or an IUD), it may not work properly while you are taking 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, diaphragms, or contraceptive foams or jellies.
Modafinil may cause some people to feel dizzy, drowsy, have trouble thinking or controlling movements, or trouble seeing clearly. Make sure you know how you react to this medicine before you drive, use machines, or do other jobs that require you to be alert, well-coordinated, or able to think or see well.
Stop using this medicine and check with your doctor right away if you have the following symptoms while taking the medicine: aggressive behavior, anxiety, depression, hallucinations, mania, thoughts of suicide, or other mental problems.
If you have been taking this medicine for a long time or in large doses and you think you may have become mentally or physically dependent on it, check with your doctor. Some signs of dependence on modafinil are:
a strong desire or need to continue taking the medicine.
a need to increase the dose to receive the effects of the medicine.
withdrawal side effects when you stop taking the medicine.
While you are taking this medicine, be careful to limit the amount of alcohol that you drink.
If you have been taking this medicine in large doses or for a long time, do not stop taking it without first checking with your doctor. Your doctor may want you to gradually reduce the amount you are taking before stopping it completely.
Do not take other medicines unless they have been discussed with your doctor. This includes prescription or nonprescription (over-the-counter [OTC]) medicines and herbal or vitamin supplements.