All uses other than jet lag: Consult a health care provider if symptoms persist for more than 4 weeks (chronic insomnia).
All uses: Consult a health care practitioner prior to use if you have asthma, cardiovascular disease, chronic kidney disease, depression, diabetes or hypoglycemia, hormonal disorders, immune system disease, liver disease, migraine headaches or seizure disorders.
Consult a health care practitioner prior to use if taking anticoagulants, anticonvulsants, blood pressure medication, immunosuppressants, sedatives, hypnotics, psychotropic drugs or steroids.
Contraindicated during pregnancy or breast-feeding.
Do not drive or operate machinery for 5 hours after taking melatonin. Melatonin should not be taken with alcohol or other drugs or natural health products with sedative properties.
Mild gastrointestinal symptoms (nausea, vomiting or cramps) may occur; in such cases, discontinue use. Allergic reactions may occur in rare cases; if this happens, discontinue use.