Final answer:
Allegra, Claritin, and Benadryl are types of antihistamines, which are over-the-counter medications used to treat symptoms of hay fever and other allergies.
Step-by-step explanation:
Allegra, Claritin, and Benadryl are types of antihistamines. These medications are commonly used to treat symptoms associated with hay fever and other allergies. People typically use antihistamines to find relief from nasal congestion, sneezing, or hives caused by allergens like pollen, dust mites, or pet dander. It's important to note that antihistamines are generally intended for short-term treatment. For long-term management of chronic allergies, which may increase the risk of health problems such as asthma, sinusitis, and lower respiratory tract infection, consulting a medical professional is advised.