Carteolol (Eye Drop)

Carteolol is an eye drop medicine used to treat high pressure inside the eye, a condition often associated with glaucoma.

Drug class	Beta Blocker
Type	Single
Forms	Eye Drop
Common strength	1% – 2%
Common Indian brands	Carteol (abroad)
Prescription status	Prescription

What Carteolol is used for

Carteolol eye drops are prescribed by ophthalmologists to help manage conditions where the pressure inside your eye is too high. This high pressure, if left untreated, can damage the optic nerve and lead to vision loss. Specifically, Carteolol is used for:

• Open-angle glaucoma: This is the most common type of glaucoma, where the drainage angle of the eye is open, but fluid still doesn’t drain properly.
• Ocular hypertension: This means you have high pressure inside your eye, but you don’t yet show signs of optic nerve damage or vision loss. Treating ocular hypertension can help prevent it from progressing to glaucoma.

By reducing the pressure in your eyes, Carteolol helps protect your vision from further damage.

How it works

Carteolol belongs to a class of medicines called beta-blockers. When you use Carteolol eye drops, the active ingredient works by reducing the production of fluid inside your eye. This fluid, called aqueous humour, is constantly produced and drained from the eye. If too much fluid is produced or if it doesn’t drain properly, the pressure inside the eye increases. By lowering the rate at which this fluid is made, Carteolol helps to decrease the intraocular pressure (IOP) to a healthier level. This particular beta-blocker is noted for having ‘intrinsic sympathomimetic activity’, which might mean it has a slightly different effect profile compared to some other beta-blockers, potentially being milder on certain body systems like lipids.

How it’s used

Carteolol eye drops are for external use only, specifically in the eyes. Always follow your doctor’s instructions precisely when using this medicine. The typical dosing for Carteolol is:

• One drop in the affected eye(s) twice a day.

It is important to maintain a consistent schedule for your eye drops to ensure they work effectively. If you are using other eye drops, wait at least 5-10 minutes between different medications to prevent one drop from washing out the other. After instilling the drop, gently press on the inner corner of your eye (near your nose) for 1-2 minutes. This simple step helps to reduce the amount of medicine that gets absorbed into your bloodstream, which can minimise potential side effects elsewhere in your body.

Do not stop using Carteolol suddenly without consulting your doctor, as this could lead to a sudden increase in your eye pressure. If you miss a dose, apply it as soon as you remember, unless it’s almost time for your next dose. In that case, skip the missed dose and continue with your regular schedule. Do not double the dose to make up for a missed one.

Always follow your ophthalmologist’s exact instructions.

Brands available in India

• Carteol (abroad)

Brand availability and pricing vary; confirm with your pharmacist.

Precautions & side effects

While Carteolol is an effective medicine for managing eye pressure, it is crucial to be aware of certain precautions because it contains a beta-blocker that can be absorbed into the body. This means it can affect other parts of your body, not just your eyes. Always discuss your full medical history with your ophthalmologist before starting Carteolol.

• Respiratory Conditions: If you have a history of asthma, chronic obstructive pulmonary disease (COPD), or any other breathing difficulties, it is very important to inform your doctor. Beta-blockers can sometimes worsen these conditions.
• Heart Conditions: Tell your doctor if you have a slow heart rate, heart failure, or any other heart disease. Beta-blockers can affect heart rhythm and function.
• Sudden Stoppage: Do not stop using Carteolol suddenly without your doctor’s advice. Abruptly stopping beta-blocker eye drops can lead to a rebound increase in eye pressure, which can be harmful.
• Systemic Absorption: To minimise the amount of medicine absorbed into your bloodstream, gently press the inner corner of your eye (near your nose) for 1-2 minutes immediately after instilling the drop.
• Pregnancy and Breastfeeding: If you are pregnant, planning to become pregnant, or breastfeeding, discuss this with your doctor. They will weigh the benefits and risks before prescribing.
• Other Medications: Inform your doctor about all other medicines you are taking, including over-the-counter drugs, supplements, and herbal remedies, as they may interact with Carteolol.
• Allergies: If you have had an allergic reaction to any eye drops or other medicines in the past, inform your doctor.

It is important to note that Carteolol is not currently approved or routinely available in India. It is included here for reference. Please discuss with your ophthalmologist about approved and available alternatives that are suitable for your condition.

Understanding Glaucoma and Ocular Hypertension

Glaucoma is a group of eye conditions that damage the optic nerve, the nerve that connects your eye to your brain. This damage is often caused by abnormally high pressure inside your eye. If left untreated, glaucoma can lead to irreversible vision loss and even blindness. The most common type, open-angle glaucoma, often has no symptoms in its early stages, which is why regular eye check-ups are so important, especially if you are over 40 or have a family history of the condition.

Ocular hypertension, on the other hand, means you have higher-than-normal pressure inside your eye, but your optic nerve has not yet shown signs of damage. While it’s not glaucoma, ocular hypertension increases your risk of developing it. Your doctor might prescribe eye drops like Carteolol to lower this pressure and help prevent the progression to glaucoma. Early detection and consistent treatment are key to preserving your vision with both conditions.

Correctly Using Eye Drops for Best Results

Using eye drops correctly is vital for them to work effectively and to minimise potential side effects. Here’s a step-by-step guide:

1. Wash Your Hands: Always start by thoroughly washing your hands with soap and water to prevent introducing germs into your eye.
2. Prepare the Bottle: If the bottle has a cap, remove it and place it on a clean surface, making sure the tip doesn’t touch anything.
3. Tilt Your Head: Gently tilt your head back or lie down.
4. Create a Pouch: Use one hand to gently pull down your lower eyelid, creating a small pouch.
5. Instil the Drop: Hold the dropper bottle upside down with the other hand, directly over your eye. Look up and squeeze the bottle gently to release one drop into the pouch you created. Be careful not to touch your eye or eyelid with the tip of the dropper.
6. Close Your Eye: Gently close your eye for a minute or two. Do not blink excessively or squeeze your eye shut tightly, as this can push the medicine out.
7. Apply Pressure: Immediately after instilling the drop, gently press your finger on the inner corner of your eye (near your nose) for 1-2 minutes. This helps prevent the medicine from draining into your tear duct and being absorbed into your bloodstream, reducing systemic side effects.
8. Wipe Excess: Use a clean tissue to gently blot any excess liquid around your eye.
9. Replace Cap: Put the cap back on the bottle tightly.
10. Wash Hands Again: Wash your hands again to remove any medicine.

If you are using more than one type of eye drop, wait at least 5-10 minutes between each medication to ensure each drop has time to work and isn’t washed away by the next.

General Hygiene, Storage, and When to Seek Help

Maintaining good hygiene is crucial when using eye drops to prevent infections. Never share your eye drops with anyone else, even if they have the same condition. Always check the expiry date on the bottle and discard the medicine after the recommended period, usually 28 days after opening, even if there’s still some liquid left. This is because once opened, the sterility of the drops cannot be guaranteed indefinitely. Store your eye drops as instructed on the packaging, typically at room temperature, away from direct sunlight and heat, and out of reach of children.

It’s important to know when to contact your doctor. If you experience any new or worsening eye pain, redness, swelling, discharge, sudden changes in vision, or if you suspect an allergic reaction (like severe itching or swelling around the eye), contact your ophthalmologist immediately. Also, if your symptoms do not improve or worsen despite using the drops as prescribed, or if you have any concerns about your treatment, do not hesitate to reach out to your healthcare provider. Regular follow-up appointments with your ophthalmologist are essential to monitor your eye pressure and the effectiveness of your treatment.

Frequently asked questions

What is Carteolol used for?

Carteolol eye drops are used to treat conditions like open-angle glaucoma and ocular hypertension, which involve high pressure inside the eye. It helps lower this pressure to protect your vision.

How does Carteolol work?

Carteolol is a beta-blocker that works by reducing the production of fluid inside your eye. This helps to lower the pressure within the eye, which is beneficial for managing glaucoma and ocular hypertension.

What are the common brands of Carteolol available in India?

Carteolol is not currently approved or routinely available in India. The brand 'Carteol' is available abroad. Please consult your ophthalmologist about approved alternatives available in India.

How should I use Carteolol eye drops?

Typically, you should instil one drop in the affected eye(s) twice a day, or as directed by your doctor. After applying the drop, gently press the inner corner of your eye for 1-2 minutes to reduce absorption into the body.

Do I need a prescription for Carteolol?

Yes, Carteolol is a prescription-only medicine. You will need a valid prescription from an ophthalmologist to obtain it.

What important precautions should I take while using Carteolol?

It's crucial to tell your doctor if you have asthma, COPD, a slow heart rate, or heart disease, as Carteolol contains a beta-blocker that can be absorbed into the body. Do not stop using it suddenly without medical advice. Remember to gently press the inner corner of your eye after instilling to reduce systemic absorption.

References

1. Glaucoma – National Eye Institute
2. What Is Glaucoma? – American Academy of Ophthalmology
3. Glaucoma – MedlinePlus
4. Blindness and vision impairment – World Health Organization
5. StatPearls – NCBI Bookshelf

---

Medically reviewed by Dr. C Jagadesh Reddy, Chief Surgeon: Cornea, Cataract and Refractive Surgery — last reviewed 2026-07-28.

This page is for general education only and is not a substitute for professional medical advice, diagnosis or treatment. Never self-medicate or reuse an old prescription. Always consult a qualified ophthalmologist before starting, changing or stopping any eye medicine.