How It Works: Visine-A contains two active ingredients, naphazoline and pheniramine. The redness associated with allergic conjunctivitis is due to inflammation or dilation of the blood vessels in the eye. Naphazoline is a vasoconstrictor, so it causes the blood vessels to shrink and clears the redness from the eye. Pheniramine is an anti-histamine, so it blocks the function of histamine in the eye.
Common Side Effects: Visine-A is relatively safe. You may experience a tingling sensation. It bypasses systemic side effects.
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