Warnings: Do not use: to make a child sleepy; with any other product containing diphenhydramine, even one used on skin. Ask a doctor before use if you have: a breathing problem such as emphysema or chronic bronchitis ; glaucoma; trouble urinating due to an enlarged prostate gland. Ask a doctor or pharmacist before use if you are taking sedatives or tranquilizers. When using this product: marked drowsiness may occur; avoid alcoholic drinks; alcohol, sedatives, and tranquilizers may increase drowsiness; be careful when driving a motor vehicle or operating machinery; excitability may occur, especially in children. If pregnant or breast-feeding, ask a health professional before use. Keep out of reach of children. In case of overdose, get medical help or contact a Poison Control Centre (1-800-222-1222) right away.