Uses of Melatonin - Treatment of sleep disorders e.g. insomnia - Prevention and treatment of jet lag. - Relieves headache, migraines and cluster headaches. - Delays decline in status in Alzheimer’s disease. - Improves tinnitus. Side effects of Melatonin - Persistent and frequent headaches - Nausea and vomiting - Drowsiness - Dizziness Interactions of Melatonin - Drugs for hypertension - Blood-thinning drugs - Immune suppressing drugs - Opioids - Alcohol - Medicines that cause drowsiness Suggested dosage of melatonin is 0.5-12 mg for sleep disorders, 10 mg for endometriosis, 2-3 mg for high blood pressure and 3-4 mg for migraine. Consult your doctor for exact dosage which is according to age, gender, medical history and condition.