Murine hayfever eye drops contains the active ingredient sodium cromoglicate of which belongs to a group of medicine called antiallergies. Sodium cromoglicate is used for the relief and treatment of the eye symptoms caused by hay fever. Murine hayfever eye drops works by reducing the bodys response to the allergy when used regularly.hay fever symptoms normally happen in late spring or early summer when pollen from grass and trees comes into contact with people. If you suffer from hay fever you may also wish to try to avoid exposure to pollen by keeping indoors, avoiding grassy areas and keeping windows and doors closed.adults and children over 6 years squeeze 1 or 2 drops into each eye, 4 times a day.the active ingredient in this medicine is sodium cromoglicate 2 wv.the other ingredients are disodium edetate, benzalkonium chloride and water. Keep out of the reach and sight of children. Do not exceed the stated dose. Do not use whilst wearing soft contact lenses.