Lomide eye drops contain the active ingredient lodoxamide tromethamine, which is used to treat eye allergy symptoms such as itching, redness, and swelling. The drops work by preventing the release of histamine and other substances in the body that cause allergic reactions. Lomide eye drops are available in a 0.1% strength and are usually applied to the affected eye(s) twice a day or as directed by a healthcare professional. As with any medication, it's important to follow the instructions of your healthcare provider and to use the drops only as prescribed.