Benadryl AH/Benadryl Special Precautions

Patients with the following conditions should be advised to consult a physician before using diphenhydramine: A respiratory condition such as emphysema (adult products), chronic bronchitis, or acute or chronic bronchial asthma; glaucoma, prostate hyperplasia with urinary retention.
Do not use with any other product containing diphenhydramine, even one used on skin.
May cause drowsiness.
Diphenhydramine may enhance the sedative effects of central nervous system, depressants including alcohol, sedatives, and tranquilizers. While taking this product, avoid alcoholic beverages and consult a healthcare professional prior to taking with central nervous system depressants.
Specific for antitussive indication: Patients should not use this product for persistent or chronic cough, such as those occurring with asthma, or where cough is accompanied by excessive secretions, unless directed by a physician.
If symptoms persist or get worse, or if new symptoms occur, patients should stop use and consult a physician.
Effects on Ability to Drive or Use Machines: Use caution when driving a motor vehicle or operating machinery.
When using to reduce difficulty in falling asleep, do not drive a motor vehicle or operate machinery.