What is the pill 396 with a 54?

The pill imprinted with "396" on one side and "54" on the other is identified as Diphenhydramine Hydrochloride 25 mg, which is an over-the-counter antihistamine. It is commonly used to relieve symptoms of allergy, hay fever, and the common cold, such as runny nose, sneezing, and itching. Additionally, it is often used as a nighttime sleep aid due to its sedative properties. Always consult with a healthcare provider before using any medication.