Widely used in over-the-counter cold and allergy medications due to its antihistamine properties. Effectively relieves symptoms such as sneezing, runny nose, itching, and watery eyes caused by allergies, hay fever, and the common cold. Often combined with decongestants, cough suppressants, or pain relievers in multi-symptom formulations. Also found in some sleep aids because of its sedative effect, which can help with occasional sleeplessness related to minor allergic conditions. Commonly administered in tablet, liquid, or dissolving strip forms for oral use.