What milligram is a round white pill 54411?

The round white pill imprinted with "54411" is identified as Diphenhydramine Hydrochloride 25 mg, which is an antihistamine commonly used to relieve symptoms of allergy, hay fever, and the common cold, such as rash, itching, watery eyes, itchy eyes/nose/throat, cough, runny nose, and sneezing. It is also used as a nighttime sleep aid.