Click on this side: https://mayomeds.com/adhd/modafinil/ Modafinil is a medication that treats excessive tiredness caused by certain sleep conditions like narcolepsy, sleep apnea, and shift work sleep disorder. Take this medication by mouth with water. Take it as directed on the prescription label at the same time every day. You can take it with or without food. If it upsets your stomach, take it with food. Side effects that you should report to your care team as soon as possible: Allergic reactions or angioedema, skin rash, itching or hives, swelling of the face, eyes, lips, tongue, arms, or legs, trouble swallowing or breathing, Increase in blood pressure.