Claritin is used to treat hay fever, allergic conjunctivitis (red, itchy eye), eczema and hives. Claritin is also used for reactions to insect bites and stings and for some food allergies.Claritin is an antihistamine medicine that relieves the symptoms of allergies. Claritin contains an active ingredient called Loratadine, which is known as a non-drowsy antihistamine (a second generation antihistamine). Claritin is much less likely to make you feel sleepy than some other antihistamines. Claritin is a histamine receptor blocker, it works by blocking the action of histamine, a substance in the body that causes allergic symptoms. When you come into contact with something you have an allergy to, such as pollen, animal hair or fur, house dust or insect bites, your body produces a chemical called histamine. Histamine is a chemical that’s released by Mast cells in your body when an allergen is encountered that can produce symptoms of sneezing, hives, itching, watery eyes, and runny nose, also known as hypersensitivity reactions. You can buy Claritin online and no prescription needed to buy this in the USA.