Pemirolast Potassium (Eye Drop)

Pemirolast Potassium is an anti-allergy eye drop used to treat seasonal allergic conjunctivitis by stabilising mast cells.

Drug class	Mast Cell Stabiliser
Type	Single
Forms	Eye Drop
Common strength	0.1%
Common Indian brands	Pemirol (abroad)
Prescription status	Prescription

What Pemirolast Potassium is used for

Pemirolast Potassium eye drops are prescribed to help manage and relieve symptoms of certain eye conditions. Specifically, it is used for:

• Seasonal Allergic Conjunctivitis: This is a common eye allergy that occurs during specific seasons, often triggered by pollen or other allergens. It can cause symptoms like itching, redness, watering, and a gritty feeling in the eyes.

As a preventive agent, Pemirolast Potassium works best when started before the allergy season begins or at the first sign of symptoms, to help prevent the full allergic reaction from developing.

How it works

Pemirolast Potassium belongs to a category of medicines known as ‘Mast Cell Stabilisers’. To understand how it works, let’s first look at what happens during an allergic reaction in your eyes.

When your eyes come into contact with an allergen (like pollen, dust mites, or pet dander), your immune system reacts. A key player in this reaction is a type of cell called a ‘mast cell’. These mast cells are found in various tissues, including the conjunctiva (the clear membrane covering the white part of your eye and lining the inside of your eyelids).

Upon exposure to an allergen, mast cells release powerful chemicals, including histamine. It is these chemicals that cause the familiar symptoms of eye allergies: itching, redness, swelling, and watering.

Pemirolast Potassium works by stabilising these mast cells. This means it prevents the mast cells from releasing those allergy-causing chemicals when they encounter an allergen. By stopping the release of histamine and other inflammatory substances, Pemirolast Potassium helps to prevent or reduce the allergic reaction, thereby alleviating the symptoms of seasonal allergic conjunctivitis.

Because it works by preventing the release of these chemicals, it is often most effective when used regularly as a preventive measure, rather than just as a treatment for acute symptoms.

How it’s used

Pemirolast Potassium is an eye drop and should be used exactly as directed by your ophthalmologist. Following their instructions carefully is crucial for the medicine to be effective and safe.

The typical dosing for Pemirolast Potassium eye drops is:

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

It is important to maintain a consistent schedule for applying the drops. 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.

Remember, this is a preventive agent, meaning it works best when used regularly, often starting before the expected allergy season begins, or at the very first signs of symptoms, to prevent the full allergic reaction from developing.

Always follow your ophthalmologist’s exact instructions.

Brands available in India

• Pemirol (abroad)

Brand availability and pricing vary; confirm with your pharmacist.

Precautions & side effects

When using Pemirolast Potassium eye drops, it’s important to be aware of certain precautions to ensure safe and effective treatment:

• Prescription Medicine: Pemirolast Potassium is a prescription eye medicine. It should only be used as directed by a qualified ophthalmologist. Never self-medicate or use an old prescription without consulting your doctor.
• Preventive Agent: This medicine is primarily a preventive agent. For best results, it should be used regularly as prescribed, especially if you know you are prone to seasonal allergic conjunctivitis. It may take some time to see the full benefits as it works by preventing allergic reactions.
• Not Routinely Available in India: Please note that Pemirolast Potassium is not currently approved or routinely available in India. This information is provided for general reference. Your ophthalmologist can discuss approved and available alternatives that are suitable for your condition.
• General Eye Drop Precautions: Always wash your hands thoroughly before and after applying eye drops. Avoid touching the tip of the dropper to your eye or any other surface to prevent contamination. If you wear contact lenses, your doctor will advise you on when to remove them before applying the drops and when you can reinsert them.
• Storage: Store the eye drops as instructed by your pharmacist or doctor, usually in a cool, dry place, away from direct sunlight and out of reach of children. Discard the bottle after the recommended period, even if some medicine remains, to avoid infection.
• Side Effects: While generally well-tolerated, like all medicines, Pemirolast Potassium can have side effects. If you experience any unusual or severe eye irritation, redness, pain, or changes in vision, stop using the drops and contact your ophthalmologist immediately.
• Other Medicines: Always inform your ophthalmologist about all other medicines you are taking, including over-the-counter drugs, supplements, and herbal remedies, to avoid potential interactions.

This page is for general education and is not a substitute for professional medical advice, diagnosis, or a prescription. Always consult your ophthalmologist for personalised advice regarding your eye health.

Understanding Seasonal Allergic Conjunctivitis

Seasonal allergic conjunctivitis is a very common eye condition that affects many people, especially during certain times of the year. It’s essentially an allergic reaction that occurs in your eyes when they come into contact with allergens like pollen from trees, grasses, or weeds, or sometimes even mould spores. When these tiny particles enter your eyes, your immune system overreacts, leading to a cascade of symptoms.

The symptoms can be quite bothersome and include:

• Itching: This is often the most prominent and irritating symptom.
• Redness: Your eyes may appear bloodshot due to dilated blood vessels.
• Watering: Excessive tear production is common as your eyes try to flush out the allergens.
• Swelling: The eyelids and the conjunctiva (the clear membrane covering the white part of your eye) can become puffy.
• Gritty or burning sensation: You might feel like there’s something in your eye.
• Sensitivity to light (photophobia): Bright lights can be uncomfortable.

While these symptoms are usually not serious, they can significantly impact your daily life, making it difficult to concentrate, read, or even enjoy outdoor activities. Identifying your triggers and taking preventive measures, along as prescribed medication, can help manage this condition effectively. Your ophthalmologist will help you understand your specific condition and recommend the best course of action.

Correct Way to Use Eye Drops

Using eye drops correctly is vital for them to work effectively and to prevent contamination. Here’s a step-by-step guide:

1. Wash Your Hands: Always start by washing your hands thoroughly with soap and water. This prevents germs from entering your eyes.
2. Prepare the Bottle: If the bottle has a cap, twist it off carefully. Do not touch the dropper tip with your fingers or let it touch any surface.
3. Position Yourself: You can either lie down or tilt your head back while sitting. Gently pull down your lower eyelid with one finger to create a small pocket.
4. Instil the Drop: Hold the dropper bottle upside down with your other hand, directly over your eye. Look upwards, and gently squeeze the bottle to release one drop into the pocket you created in your lower eyelid. Try not to blink immediately.
5. Close Your Eye: Gently close your eye for a minute or two. This helps the medicine absorb properly and prevents it from draining too quickly. You can also press a finger gently on the inner corner of your eye (near your nose) to block the tear duct.
6. Wipe Excess: Use a clean tissue to gently blot any excess liquid around your eye.
7. Replace the Cap: Put the cap back on the bottle tightly.
8. Wash Hands Again: Wash your hands once more to remove any medicine residue.

If you need to use more than one type of eye drop, wait at least 5-10 minutes between different drops to allow each medicine to absorb properly.

General Hygiene, Storage, and When to Seek Medical Help

Maintaining good hygiene and proper storage of your eye drops are crucial for your eye health. Always store your Pemirolast Potassium eye drops as instructed on the packaging or by your pharmacist, typically in a cool, dry place, away from direct sunlight and out of reach of children. Never use eye drops past their expiry date or the recommended discard date after opening (usually 28 days, but check the specific instructions for your product). Using expired or contaminated drops can lead to serious eye infections.

It’s also important to be vigilant about your eye health and know when to seek professional medical help. While Pemirolast Potassium is generally safe, if you experience any of the following, contact your ophthalmologist immediately:

• Increased Eye Pain or Discomfort: If your eyes become more painful, irritated, or uncomfortable after using the drops.
• Worsening Redness or Swelling: If the redness or swelling in your eyes gets worse or does not improve.
• Changes in Vision: Any sudden blurriness, decreased vision, or seeing halos around lights.
• Discharge from the Eye: Any new or increased pus-like or watery discharge.
• Sensitivity to Light: If you develop severe sensitivity to light.
• Signs of Allergic Reaction: Though rare, if you experience symptoms like rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, or trouble breathing, seek emergency medical attention.

Remember, your ophthalmologist is your best resource for any concerns regarding your eye health and medication. Do not hesitate to reach out to them if you have questions or experience any worrying symptoms.

Frequently asked questions

What is Pemirolast Potassium used for?

Pemirolast Potassium eye drops are used to treat seasonal allergic conjunctivitis, which is an eye allergy that occurs during specific seasons, often triggered by allergens like pollen.

How does Pemirolast Potassium work?

Pemirolast Potassium is a mast cell stabiliser. It works by preventing mast cells in your eyes from releasing chemicals like histamine, which cause allergic symptoms such as itching, redness, and watering. By stabilising these cells, it helps to prevent or reduce the allergic reaction.

What are the common Indian brands for Pemirolast Potassium?

Pemirolast Potassium is not currently approved or routinely available in India. The brand 'Pemirol' is known abroad. Your ophthalmologist can advise you on approved and available alternatives in India.

How should I use Pemirolast Potassium eye drops?

Pemirolast Potassium eye drops are typically used by applying 1 drop twice a day in the affected eye(s), or as directed by your ophthalmologist. It's important to use it consistently as a preventive measure.

Do I need a prescription for Pemirolast Potassium?

Yes, Pemirolast Potassium is a prescription eye medicine and should only be used under the guidance and prescription of a qualified ophthalmologist.

What are the key precautions to take when using Pemirolast Potassium?

Key precautions include using it only as prescribed by an ophthalmologist, understanding that it acts as a preventive agent, and noting that it is not routinely available in India. Always wash your hands before and after use, avoid touching the dropper tip, and store it properly. If you experience any unusual or severe eye irritation or side effects, contact your doctor immediately.

References

1. Eye Allergies – American Academy of Ophthalmology
2. Eye Diseases – MedlinePlus
3. Learn about eye health – National Eye Institute (NIH)
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.