Consult a health care practitioner if insomnia persists beyond 3 weeks (chronic insomnia) or worsens, if there is liver trouble, inflammation, or gastric ulcer. May cause drowsiness, exercise caution when operating heavy machinery, motor vehicles or activities that require alertness. Do not use during pregnancy or breastfeeding, with other sedatives or alcoholic beverages. Discontinue use if hypersensitivity occurs.