What is yellow and blue capsule with 224 over 3850?

The yellow and blue capsule imprinted with "224" over "3850" is identified as Diphenhydramine Hydrochloride 25 mg, an over-the-counter antihistamine used to relieve symptoms of allergy, hay fever, and the common cold. It can help with symptoms such as runny nose, sneezing, and itchy/watery eyes. Additionally, it is often used as a nighttime sleep aid due to its sedative effects. Always consult a healthcare professional before using any medication.