Otrivine Anistin belongs to the group of medicines known as anti-inflammatory eye preparations. These eye drops are used to relieve the eye symptoms of hayfever. Exposure to irritants such as plant pollens, pet fur or pollution can cause the body to produce a chemical called histamine. The release of histamine can cause allergic symptoms such as red, itchy, sticky and watery eyes, often referred to as hayfever. These eye drops relieve the eye symptoms of hayfever by blocking the action of histamine in the body.