Tetrahydrozoline is a decongestant used in eye drops. It narrows the small blood vessels in the white of the eye, reducing redness and swelling. It is often combined with steroids, antibiotics or anti-allergy agents.

What Tetrahydrozoline Is Used For

Red, irritated eyes
Allergic conjunctivitis, in combination drops
Eye inflammation, in steroid combinations prescribed by an eye doctor
Minor eye irritation from dust or smoke

Common Side Effects

Stinging or burning on application
Enlarged pupils
Rebound redness with frequent use

Precautions

Do not use decongestant eye drops for more than a few days without advice. Avoid them if you have narrow-angle glaucoma. Steroid-containing combinations should only be used under an eye doctor's supervision, because long use can raise eye pressure.

This page is general information only. It is not a substitute for advice from your doctor or pharmacist, and it does not include dosage. Always follow the directions given to you and read the leaflet inside the pack.