Used primarily as an antihistamine in the treatment of allergic conditions such as hay fever, conjunctivitis, and chronic urticaria. It works by blocking histamine H1 receptors, reducing symptoms like sneezing, itching, and runny nose. Acrivastine is known for its rapid onset of action, often providing relief within 15 to 30 minutes after oral administration. Due to its short duration of effect, it is typically taken multiple times a day. It is often combined with pseudoephedrine to enhance symptom relief, particularly for nasal congestion. Acrivastine is considered non-sedating or minimally sedating compared to older antihistamines, making it suitable for daytime use.