What is a tan pill marked g 4910?

A tan pill marked "G 4910" is identified as Diphenhydramine Hydrochloride 25 mg, which is an over-the-counter antihistamine commonly used to relieve symptoms of allergy, hay fever, and the common cold. It can help alleviate symptoms such as runny nose, sneezing, and itching. Additionally, it is often used as a sleep aid due to its sedative properties. Always consult a healthcare professional before using any medication.