Experience temporary relief from corneal edema with Rugby's Sodium Chloride Hypertonicity Ophthalmic Ointment 5%. Our formula is made with 50 mg of Sodium Chloride and is free from alcohol, gluten, latex, peanuts, soy, and sugar. To use, pull down the lower lid of the affected eye(s) and apply a small amount (about 0.25 inch) of the ointment to the inside of the eyelid. Apply every 3 to 4 hours