You should talk with your healthcare provider prior to taking this medication if you have:
- Liver disease, such as liver failure, cirrhosis, or hepatitis
- Kidney disease, including kidney failure (renal failure)
- Any heart condition or problem
- High blood pressure (hypertension)
- Any allergies, including allergies to food, dyes, or preservatives.
Also, let your healthcare provider know if you are:
- Pregnant or thinking of becoming pregnant (see Provigil and Pregnancy)
- Breastfeeding (see Provigil and Breastfeeding).
Make sure to tell your healthcare provider about all other medicines you are taking, including prescription and non-prescription medicines, vitamins, and herbal supplements.
(Click Precautions and Warnings With Modafinil to learn more, including information on who should not take the drug.)
At this time, it is not known exactly how modafinil works to promote wakefulness. It does not work like other stimulants. Modafinil is known to affect certain brain chemicals, but this does not seem to be the way that the drug works, since blocking modafinil's effect on such chemicals does not stop it from working.
When and How Do I Take It?General considerations for when and how to take modafinil include the following:
- The medication comes in tablet form. It is usually taken by mouth once a day.
- You can take it with or without food. If the medicine seems to bother your stomach, try taking it with food.
- For the medication to work properly, it must be taken as prescribed. Modafinil will not work if you stop taking it.