What is a green capsule with EP 112 on it?

A green capsule marked with "EP 112" is identified as Diphenhydramine Hydrochloride 25 mg, an over-the-counter antihistamine. It is commonly used to relieve symptoms of Allergies, hay fever, and the common cold, such as sneezing, runny nose, and itching. It can also be used as a short-term sleep aid due to its sedative properties. Always consult a healthcare professional before using any medication.