There are many brands and forms of diphenhydramine available. Read the dosing instructions carefully for each product because the amount of diphenhydramine may be different between products.

One ingredient in this product is acetaminophen. Taking too much acetaminophen may cause serious (possibly fatal) liver disease. Adults should not take more than 4000 milligrams (4 grams) of ...

An elderly man presented with the history of diphenhydramine hydrochloride overdose as a suicidal attempt. At presentation, he was in an acute confusional state with several anticholinergic features ...

In the parenteral form, diphenhydramine hydrochloride is supplied at a concentration of 50 mg/mL and a pH of 4.0 to 6.5 that is adjusted with either sodium hydroxide or hydrochloric acid. It is ...