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