Brimonidine (eye): uses, side effects & brands

Written & medically reviewed by Dr. Sanjay Anbu, MBBS · Last reviewed 5 November 2026

Brimonidine eye drops reduce eye pressure in glaucoma. It belongs to the Eye (ophthalmic) medicine group. Eye drops and ointments treat glaucoma, infections, allergy, inflammation or dryness of the eyes.

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Drug type — dosing is set by your doctor

Measure	Range
Drug class	Eye (ophthalmic) medicine
Type	Prescription
Dose	Individual — ask your doctor or pharmacist

What it is used for

Open-angle glaucoma
Raised eye pressure (ocular hypertension)
Combined with other drops when one is not enough

Common brand names

India: Alphagan, Iobrim
Worldwide: Alphagan

Common side effects

Eye redness or itching
Dry mouth
Tiredness or drowsiness
Red, itchy, swollen eyelids (allergy can appear after months)

Before taking it — precautions

Not for babies and young children — it can cause serious drowsiness and slow breathing
Do not use with MAOI antidepressants; tell your doctor about all medicines
Tell your doctor about heart disease, low blood pressure or depression

When to see a doctor urgently

A child exposed to the drops who is very sleepy or breathing slowly (urgent)
Swollen, very itchy eyelids or allergic reaction
Fainting or severe dizziness

Not a prescription — no dose shown. The right dose of brimonidine depends on age, weight, kidney/liver function and the condition, so MedDroid does not show a dose here. Always get your dose from a doctor or pharmacist and the leaflet inside the pack. General educational information only.

Frequently asked questions

Why do I feel sleepy?

Some brimonidine is absorbed and can cause tiredness. Take care driving until you know how it affects you.

Can children use it?

It is not used in young children because it can dangerously slow breathing. Keep it out of their reach.

My eyes became red and itchy after months — why?

This can be a delayed allergy to brimonidine. See your eye doctor, who may change the drop.

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Sources & further reading

Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.