Medscape – Hypersensitivity reactions, insomnia, antihistamine-specific dosing for Benadryl, Nytol (diphenhydramine), frequency-based adverse effects, … Benadryl is an OTC antihistamine used to treat a number of conditions. Taking too much can pose severe health risks, including overdose. Learn more here. The standard adult Benadryl dose is 25-50 mg every 4-6 hours, max 300 mg in 24 hours. Learn safe limits, sleep-aid doses, and when to skip … Detailed dosage guidelines and administration information for Benadryl Injection (diphenhydramine hydrochloride). Includes dose adjustments … Benadryl overdose signs include strong drowsiness, confusion or hallucinations, extreme dryness, and fast or irregular heartbeat. What to do in … Find BENADRYL® dosage information for adults, children, and toddlers and learn how much you and your family should take with our allergy medicine … Concomitant use can increase the risk of hypotension, respiratory depression, profound sedation, coma, and death as well as urinary retention and/or severe … … 400 mg per day. For typical allergy symptoms, the standard adult dose is 25-50 mg every 4-6 hours, not to exceed 300 mg in 24 hours ((Kaplan, 2017)). 2025