What is the primary purpose of antihistamines?

The primary purpose of antihistamines is to manage allergies. These medications work by blocking the action of histamine, a substance produced by the body during an allergic reaction. When histamine binds to its receptors, it can cause symptoms such as itching, sneezing, runny nose, and hives. Antihistamines effectively alleviate these symptoms by preventing histamine from exerting its effects.

While some antihistamines may have sedative effects and can promote sleep, this is not their main indication. Their primary role is to treat allergic reactions and relieve various allergic symptoms. The other options, such as enhancing mood or increasing alertness, are not associated with the function of antihistamines and do not reflect their intended use within the realm of allergy management.