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Alphagan/Brimonidine

Alphagan (Brimonidine) are eye drops for the eyes that are used to reduce pressure inside the eyes in people with open-angle glaucoma or ocular hypertension (high pressure inside the eye) Ocular hypertension is the main risk factor involved in glaucoma, a disease that, if left untreated, can lead to severe and irreversible loss of visual capacity. The Alphagan brand of this medicine is only available with a prescription. Alphagan is for use in adults and children over 2 years of age.

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Please note that whilst you are able to request the medicine strength and size required,
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Starts at £36.00
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Pack Price (£)
- 0.2% 5ml x 1 Pack 36.00
- 0.2% 5ml x 2 Packs 65.00
- 0.2% 5ml x 3 Packs 94.00

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Alphagan / Brimonidine Eye Drops for Glaucoma Treatment and Eye Pressure Control

When you're living with glaucoma or raised eye pressure, it's not something you can feel day to day, but over time, it can quietly affect your vision. That's why managing it early and consistently matters.

Alphagan drops (brimonidine eye drops) are widely used in the UK as a trusted glaucoma treatment. These prescription eye drops are designed to reduce eye pressure inside the eye, lowering the risk of long-term damage. Whether you've been diagnosed with open-angle glaucoma or ocular hypertension, Alphagan offers a targeted and clinically proven way to manage your condition.

What Are Alphagan / Brimonidine Eye Drops Used For?

Alphagan eye drops are used to lower intraocular pressure (IOP) in people with glaucoma or ocular hypertension. Raised pressure inside the eye can damage the optic nerve over time, which may lead to vision loss if not controlled. Brimonidine eye drops are prescribed to bring that pressure down and keep it stable.

These drops are typically used for open-angle glaucoma, ocular hypertension treatment, and patients needing additional IOP lowering drops alongside other treatments. They may be used alone or alongside other glaucoma medication, depending on how your eye pressure responds.

How Alphagan / Brimonidine Eye Drops Work

Alphagan P and other brimonidine eye drops work by reducing fluid production in the eye and improving fluid drainage. The active ingredient, brimonidine tartrate, belongs to a group called alpha-agonist drops. These act on specific receptors in the eye to decrease the amount of fluid (aqueous humour) produced and increase the outflow of fluid from the eye.

This dual action leads to a noticeable reduction in intraocular pressure, which is essential for protecting your vision over time.

How to Use Alphagan / Brimonidine Eye Drops

Alphagan eye drops are usually applied three times daily, spaced evenly throughout the day, as advised by your prescriber during your consultation with Pharmacy Planet.

  • Wash your hands before use.
  • Tilt your head back slightly.
  • Apply one drop into the affected eye.
  • Close your eyes gently for a few seconds.

Use the drops approximately every 8 hours. If using other eye drops, wait at least 5 minutes between applications. Avoid touching the tip of the bottle to your eye or skin. If you wear contact lenses, wait at least 15 minutes before reinserting them. Using the drops consistently is key to maintaining stable eye pressure.

Who Can Use Alphagan / Brimonidine Eye Drops?

Alphagan eye drops are suitable for adults with glaucoma or raised eye pressure, following a prescription assessment. They are commonly recommended for adults diagnosed with open-angle glaucoma, individuals with consistently high eye pressure, and patients who need an alternative or additional glaucoma treatment.

You should not use Alphagan if you are allergic to brimonidine or any ingredient in the drops, are under 2 years of age, or have previously had a reaction to similar prescription eye drops. Caution may also be needed if you have cardiovascular issues, low blood pressure, circulation-related conditions, or depression or neurological conditions.

Possible Side Effects of Alphagan / Brimonidine Eye Drops

Like all glaucoma medications, Alphagan may cause side effects in some people.

Common Side Effects (usually mild and may settle as your body adjusts):

  • Red or irritated eyes
  • Dry mouth
  • Slight burning or stinging after use
  • Blurred vision
  • Feeling tired or drowsy

Serious Side Effects — Seek medical attention if you notice:

  • Severe eye pain or swelling
  • Allergic reactions such as rash or itching
  • Changes in heart rate or blood pressure
  • Dizziness or fainting

Alphagan eye drops can interact with blood pressure medications or cardiac treatments, antidepressants such as tricyclic antidepressants, MAO inhibitors, and sedatives, alcohol, or strong pain relief medicines. Always disclose your current medication during your consultation.

Why Do People Choose Alphagan / Brimonidine Eye Drops?

Alphagan drops are chosen for their targeted action and reliable pressure-lowering effect in glaucoma care. People often prefer this treatment because it directly targets intraocular pressure, works through a dual mechanism for more effective pressure control, can be combined with other IOP lowering drops if needed, is widely recognised as a trusted prescription eye-drop option in the UK, and offers a non-invasive way to manage glaucoma daily. For many, brimonidine eye drops become an important part of long-term eye care and vision protection.

How Does the Ordering Process Work at Pharmacy Planet?

Getting Alphagan drop online is simple and safe with Pharmacy Planet.

  1. Complete a short medical questionnaire and share details about your eye condition and current treatment.
  2. A UK-registered prescriber assesses your suitability.
  3. If approved, your glaucoma medication is dispensed and delivered to your door.
Alphagan / Brimonidine Eye Drops

Alphagan (brimonidine) is a widely used UK glaucoma treatment that reduces intraocular pressure to protect vision. A trusted alpha-agonist prescription eye drop for open-angle glaucoma and ocular hypertension.

Used for open-angle glaucoma, ocular hypertension, and patients needing additional IOP lowering alongside other treatments — alone or combined with other glaucoma medication.

Brimonidine tartrate is an alpha-agonist that decreases aqueous humour production and increases fluid outflow. This dual action reduces intraocular pressure and helps protect vision over time.

Three times daily, approximately every 8 hours. Wash hands, tilt head, apply one drop, close eyes gently. Wait 5+ minutes between different eye drops; remove contacts before use and reinsert after 15 minutes. Consistent use is key to stable eye pressure.

Suitable for adults with open-angle glaucoma, high eye pressure, or needing an alternative/additional glaucoma treatment.

Not suitable for allergy to brimonidine, under age 2, or previous reaction to similar drops. Caution for cardiovascular issues, low blood pressure, circulation problems, or depression/neurological conditions.

Common (usually mild and settling): Red/irritated eyes, dry mouth, burning/stinging, blurred vision, tiredness/drowsiness

Serious: Seek medical attention for severe eye pain/swelling, allergic reactions (rash/itching), heart rate/blood pressure changes, or dizziness/fainting

Targeted dual-action IOP reduction, combinable with other glaucoma treatments, widely trusted in the UK, and offers a non-invasive daily approach to long-term glaucoma and vision protection.

Getting Alphagan drop online is simple and safe with Pharmacy Planet.

  1. Complete a short medical questionnaire and share details about your eye condition and current treatment.
  2. A UK-registered prescriber assesses your suitability.
  3. If approved, your glaucoma medication is dispensed and delivered to your door.
Frequently Asked Questions

Alphagan drops usually start lowering eye pressure within a few hours. The full effect builds over several days with regular use, so consistent daily application is important.

Yes, Alphagan is often used alongside other glaucoma medications. If using multiple eye drops, leave at least 5 minutes between each to ensure proper absorption.

Yes, Alphagan drops are commonly prescribed for both glaucoma and ocular hypertension. They reduce intraocular pressure, which is the main goal in both conditions.

Mild stinging or redness is a common side effect when starting Alphagan. This usually settles with continued use, but persistent irritation should be checked.

Yes, but remove your contact lenses before applying the drops. Wait at least 15 minutes before putting them back in to avoid irritation or absorption issues.

If you miss a dose, apply the next one at your usual time. Do not double the dose, as this will not improve results and may increase side effects.

In some people, the pressure-lowering effect may reduce over time. Regular eye check-ups are important so your treatment can be adjusted if needed.

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Review By

GURDEV SEHMI

Last Updated On : Mar 13 2026

BSc Pharm, MRPharmS, Independent Prescriber, Superintendent Pharmacist, Clinical Lead

GPhC Number: 2050925

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Authored By

GURDEV SEHMI

Last Reviewed On : Mar 23 2026

BSc Pharm, MRPharmS, Independent Prescriber, Superintendent Pharmacist, Clinical Lead

GPhC Number: 2050925