Antihistamines and decongestants are the top-selling types of allergy medicines. They typically come in pill, capsule, or tablet form and help to alleviate sinus congestion or irritation by reducing swelling of the mucous membranes. Nasal sprays are another common allergy medication. You simply insert the application tip into your nose and gently spray the solution into your nasal passages to reduce inflammation and congestion. Eye drops can also help alleviate allergy symptoms. The solution treats itchy and watery eyes, and some brands contain antihistamines to fend off pollen and other common allergens. Corticosteroid cream is a topical allergy treatment for rashes and skin irritations. It is applied directly to the site to relieve itching and swelling.