Adults and children 3 years and older: Put 1 drop in the affected eye(s) twice daily, every 8-12 hours, no more than twice per day.
Children under 3 years of age: Consult a doctor.
Sources:
2009 Gallup Study of Allergies (N=608 allergy medication users).
Torkildsen GL, Abelson MB, Gomes PJ. Bioequivalence of Two Formulations of Ketotifen Fumarate Opthalmic Solution: A Single-Center, Randomized, Double-Masked Conjunctival Allergen Challenge investigation in Allergic Conjunctivitis. Clin Ther. 2008;30(7):1272-1282.
M Kidd, S H McKenzie, I Steven, C Cooper, R Lanz, and the Australian Ketotifen Study Group. Efficacy and safety of ketotifen eye drops in the treatment of seasonal allergic conjunctivitis. Br J Ophthalmal 2003;87:1206-1211.
Grant SM, Goa KL, Fitton A, Sorkin EM. Ketotifen, A review of its pharmacodynamic and pharmacokinetic properties, and therapeutic use in asthma and allergic disorders. Drugs. 1990;40(3):412-48.
*In a 108-patient randomized, double-masked, active and placebo-controlled study (P=0.001 for onset of action and < 0.001 for duration of activity).
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