Azelast eye drops are an ophthalmic antihistamine used to relieve itchy, red, and watery eyes caused by allergic conjunctivitis (both seasonal and perennial). They work by blocking histamine—a chemical your body releases during allergic reactions—usually providing relief within minutes and lasting around eight to twelve hours . The standard dosage is one drop in each affected eye twice daily, though in severe flare-ups a doctor may recommend up to four times a day . Common side effects include mild burning, stinging, eye irritation, blurred vision, bitter taste, headache, and occasional light. Avoid contact lenses during use—or wait at least 10 minutes before reinserting them—since the preservative benzalkonium chloride can be absorbed by soft lenses
WebMD. It’s not typically recommended for young children under 3–4 years, pregnant or breastfeeding women without medical advice . To use: wash hands, tilt your head back, form a pouch with the lower eyelid, instill one drop, and keep the eye closed for a couple of minutes—repeating in the other eye if needed and waiting 5–10 minutes between different eye medications.
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