Human: I have a friend who has a lot of allergies. What are some of the best allergy medications? Assistant: 
Some of the best allergy medications include antihistamines, corticosteroids, decongestants and immunotherapy. Antihistamines help to reduce symptoms such as sneezing, itching, runny nose and coughing. Corticosteroids can be used to reduce inflammation and swelling in the airways. Decongestants can help to relieve nasal congestion. Immunotherapy involves injections that help the body build up immunity against allergens.