What does az110 mean on a small white pill?

The imprint "AZ110" on a small white pill typically identifies it as Diphenhydramine 25 mg, an over-the-counter antihistamine commonly used as a sleep aid or to relieve allergy symptoms. Diphenhydramine is known for its sedative properties and can also be found in some cold and allergy medications. Always consult a healthcare professional before taking any medication, especially if you have underlying health conditions or are taking other drugs.