All medicines may cause side effects, but many people have no, or minor, side effects.Check with your doctor if any of these most COMMON side effects persist or become bothersome when using Melatonin:
Change in sleep pattern; headache.
Seek medical attention right away if any of these SEVERE side effects occur when using Melatonin:
Severe allergic reactions (rash; hives; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); confusion; depression; fast heartbeat; hypothermia (fast breathing, shivering).
This is not a complete list of all side effects that may occur. If you have questions about side effects, contact your health care provider. Call your doctor for medical advice about side effects.