Ramelteon may cause a severe allergic reaction. Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; nausea and vomiting; swelling of your face, lips, tongue, or throat.
Some people using this medicine have engaged in activity while not fully awake and later had no memory of it. This may include walking, driving, eating, having sex, or making phone calls. If this happens to you, call your doctor right away.
Call your doctor at once if you have:
unusual thoughts or behavior, hallucinations, worsening depression, thoughts about hurting yourself;
a missed menstrual period;
nipple discharge; or
loss of interest in sex.
Common side effects may include:
drowsiness, tired feeling;
dizziness;
nausea; or
worsening sleep problems.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
 Ramelteon side effects (more detail)
