Tasimelteon Side Effects
What should I watch for?
Because of individual differences in circadian rhythms, daily use for several weeks or months may be needed before the benefit of this medicine occurs.
You may get drowsy or dizzy. Do not do anything that requires mental alertness after taking your dose. Limit your activities to preparing for bed after taking this medicine. Do not stand or sit up quickly, especially if you are an older patient. This reduces the risk of dizzy or fainting spells. Alcohol may interfere with the effect of this medicine. Avoid alcoholic drinks.
If you smoke, tell your doctor if you notice this medicine is not working well for you. Talk to your doctor if you are a smoker or if you decide to stop smoking.
Side Effects to watch for
Side effects that you should report to your doctor or health care professional as soon as possible:
- allergic reactions like skin rash, itching or hives, swelling of the face, lips, or tongue
- breathing problems
- dark urine
- fever or chills
- general ill feeling or flu-like symptoms
- light-colored stools
- loss of appetite, nausea
- pain when urinating
- right upper belly pain
- trouble passing urine or change in the amount of urine
- unusually weak or tired
- yellowing of the eyes or skin
Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):
- unusual dreams or nightmares