Do not drive or use machinery for 5 hours after taking melatonin. Consult a health care practitioner if sleeplessness persists for more than 4 weeks (chronic insomnia). Consult a health care practitioner if symptoms persist or worsen. Avoid taking with alcohol or products that cause drowsiness. Consult a health care practitioner prior to use if you are taking steroids or blood thinners, medications for seizure or blood pressure, or medications to suppress the immune system, to affect mental state, or to increase sedation. Consult a health care practitioner prior to use if you have cardiovascular, immune, liver, or chronic kidney disease, hormonal or seizure disorders, asthma, depression, diabetes, low blood sugar, or migraine. Stop use if allergy occurs or if you experience headache, confusion, or nausea. Consult a health care professional before use if you are pregnant or breastfeeding, are taking medication, or have a medical condition. For occasional and/or intermittent use only. Keep out of the reach of children.