Numark Hayfever Relief 2% Eye Drops 10ml Numark Hayfever Relief 2% Eye Drops 10ml Numark Hayfever Relief 2% Eye Drops 10ml are used to relieve and treat the eye symptoms of hayfever, including itchy, red, watery, and irritated eyes. The active ingredient, sodium cromoglicate 2% w/v, helps reduce allergic reactions in the eyes and can be used during periods of exposure to pollen and other allergens.