Opcet

Adults and children (age 2 years and above): The recommended dosage is to instill one drop in the affected eye(s) twice daily (approximately 8 hours apart).

The most common adverse reactions are ocular hyperemia, instillation site pain and visual acuity reduction.

Cetirizine 0.24% ophthalmic solution is indicated for the treatment of ocular itching associated with allergic conjunctivitis.

Cetirizine, an antihistamine, is a histamine-1 (H1) receptor antagonist. Its effects are mediated via selective inhibition of H1 histamine receptors. The antihistaminic activity of cetirizine has been documented in a variety of animal and human models. In vivo and ex vivo animal models have shown negligible anticholinergic and antiserotonergic activity. In vitro receptor binding studies have shown no measurable affinity for other than H1 receptors.

In healthy subjects, bilateral topical ocular dosing of one drop of cetirizine ophthalmic solution 0.24% resulted in a mean cetirizine plasma Cmax of 1.7 ng/mL following a single dose and 3.1 ng/mL after twice-daily dosing for one week. The observed mean terminal half-life of cetirizine was 8.6 hours following a single dose and 8.2 hours after twice-daily dosing of Cetirizine for one week.

Care should be taken not to touch the eyelids or surrounding areas with the dropper tip of the bottle to prevent contaminating the tip and solution. Keep the bottle closed when not in use. Patients should be advised not to wear a contact lens if their eye is red. Remove contact lenses prior to instillation of the drug. Lenses may be reinserted after 10 minutes following the drug administration.

Ophthalmic Anti-allergic preparations