Kanamycin Eye Drops: Uses, Brands & Dosage

Kanamycin is an antibiotic medicine, primarily used to treat certain bacterial eye infections, especially those resistant to other treatments.

Drug class	Antibiotic (Aminoglycoside)
Type	Single
Forms	Eye Drop / Injection
Common strength	Varies
Common Indian brands	Systemic (Kanamax), legacy ophthalmic
Prescription status	Prescription

What Kanamycin is used for

Kanamycin is an antibiotic medicine that falls under the category of anti-infectives. It is primarily used to treat bacterial infections, particularly those caused by gram-negative bacteria that may be resistant to other antibiotics. While it was once more commonly used, it is now considered a legacy antibiotic for ophthalmic use, meaning it is used less frequently but can still be valuable in specific situations where other treatments might not be effective.

Treating certain bacterial eye infections, especially resistant gram-negative infections.

How it works

Kanamycin belongs to a group of antibiotics called aminoglycosides. Its mechanism of action involves inhibiting protein synthesis within the bacteria. Proteins are essential for bacteria to grow, multiply, and survive. By interfering with this vital process, Kanamycin effectively stops the bacteria from spreading and helps your body’s immune system clear the infection. This targeted action helps to resolve the eye infection and restore eye health.

How it’s used

Kanamycin is available in different forms, including eye drops and injections. For eye conditions, it is typically prescribed as eye drops. The exact dosing and duration of treatment will be determined by your ophthalmologist based on the type and severity of your eye infection. It is crucial to follow their instructions precisely. Do not alter the dose or stop using the medicine without consulting your doctor, even if your symptoms improve, as this can lead to the infection returning or becoming more difficult to treat.

When using eye drops, always wash your hands thoroughly before and after application. Tilt your head back, pull down your lower eyelid to create a small pocket, and gently squeeze the prescribed number of drops into the pocket. Close your eye gently for a minute or two to allow the medicine to spread. Avoid touching the tip of the dropper to your eye or any other surface to prevent contamination.

Always follow your ophthalmologist’s exact instructions.

Brands available in India

Systemic (Kanamax)
legacy ophthalmic

Brand availability and pricing vary; confirm with your pharmacist.

Good to know

Prescription eye medicine — use only as directed by a qualified ophthalmologist. This page is for general education and is not a substitute for professional medical advice, diagnosis or a prescription. Do not self-medicate or reuse an old prescription.

Precautions & side effects

Kanamycin is a prescription medicine and should only be used under the guidance of a qualified ophthalmologist. While it is primarily a legacy antibiotic for ophthalmic use, it is also used in systemic treatments, including some regimens for tuberculosis. Therefore, your doctor will consider your complete medical history before prescribing it.

It is important to inform your doctor about any other medications you are taking, including over-the-counter drugs, supplements, or herbal remedies, to avoid potential interactions. If you experience any unusual or severe side effects, or if your condition worsens, contact your ophthalmologist immediately.

Remember, this page is for general education and is not a substitute for professional medical advice, diagnosis, or a prescription. Do not self-medicate or reuse an old prescription.

Understanding Eye Infections and Their Treatment

Eye infections are a common concern that can affect people of all ages. They occur when harmful microorganisms, such as bacteria, viruses, or fungi, invade any part of the eye or its surrounding tissues. Common symptoms of eye infections can include redness, itching, watering, discharge, pain, swelling, and sensitivity to light. While some minor infections might resolve on their own, many require medical attention and specific treatment to prevent complications and ensure the health of your vision.

Bacterial eye infections, in particular, can range from mild conjunctivitis (pink eye) to more serious conditions like corneal ulcers, which can potentially impact vision if not treated promptly and effectively. Your ophthalmologist will carefully examine your eye, and sometimes take a sample for testing, to identify the exact type of infection and the specific bacteria causing it. This helps them choose the most appropriate antibiotic, like Kanamycin, if it is determined to be the right choice for your particular infection, especially if it involves bacteria that are resistant to other common antibiotics. Early diagnosis and adherence to your doctor’s prescribed treatment plan are crucial for a successful recovery and to protect your precious eyesight.

Correct Application of Eye Drops and Ointments

Using eye drops or ointments correctly is vital for the medicine to work effectively and to prevent further irritation or contamination. Always begin by washing your hands thoroughly with soap and water to ensure they are clean. If you are using eye drops, gently shake the bottle a few times (if instructed) and then remove the cap. Tilt your head back slightly or lie down. With one hand, gently pull down your lower eyelid to create a small pocket. With the other hand, hold the dropper bottle directly over your eye, being careful not to let the tip touch your eye, eyelid, or eyelashes. Squeeze the bottle gently to release the prescribed number of drops into the pocket you created. Close your eye gently for one to two minutes, allowing the medicine to spread across the eye surface. Avoid blinking excessively or squeezing your eyes shut tightly, as this can push the medicine out.

If you are using an eye ointment, after washing your hands, gently pull down your lower eyelid. Squeeze a small ribbon of ointment (usually about 1 cm, or as directed by your doctor) into the pocket along the inside of your lower eyelid. Close your eye and roll your eyeball around to help spread the ointment. You might experience temporary blurred vision after applying ointment, which is normal. Always replace the cap immediately after use and avoid sharing your eye medicines with anyone else.

General Eye Hygiene, Storage, and When to Seek Help

Maintaining good eye hygiene is essential, especially when you have an eye infection or are using eye medicines. Always wash your hands before and after touching your eyes or applying medication. Avoid rubbing your eyes, as this can worsen irritation or spread the infection. If you wear contact lenses, your doctor will likely advise you to stop wearing them until the infection has completely cleared and your eyes have fully recovered. Always use fresh, clean tissues to wipe any discharge from your eyes, wiping from the inside corner outwards, and discard them immediately.

Proper storage of your eye medicine is also important. Store Kanamycin eye drops or ointment at room temperature, away from direct sunlight and excessive heat, unless your pharmacist or doctor gives specific instructions for refrigeration. Always check the expiry date on the packaging and discard any medicine that has expired. Do not use eye drops or ointments that appear discoloured or cloudy, or if the seal is broken. Once opened, eye drop bottles typically have a limited shelf life (often 28 days), even if there is medicine remaining; your pharmacist can advise you on the exact duration.

It is crucial to know when to seek further medical attention. If your symptoms do not improve after a few days of using Kanamycin as prescribed, or if they worsen, contact your ophthalmologist immediately. Also, seek urgent medical advice if you experience severe pain, sudden vision changes, intense redness, or if your eye becomes very sensitive to light. These could be signs of a more serious condition requiring prompt intervention. Always remember that your ophthalmologist is your best resource for managing your eye health.

Frequently asked questions

What is Kanamycin used for?

Kanamycin is an antibiotic medicine used to treat certain bacterial eye infections, particularly those caused by gram-negative bacteria that may be resistant to other antibiotics. It is considered a legacy antibiotic for ophthalmic use.

How does Kanamycin work?

Kanamycin works by inhibiting protein synthesis in bacteria. Proteins are vital for bacterial growth and survival. By interfering with this process, Kanamycin stops the bacteria from multiplying and helps to clear the infection.

What are the common Indian brands for Kanamycin?

While Kanamycin has legacy ophthalmic use, systemically it is known by the brand Kanamax. For eye use, it is primarily available as a generic or in specific formulations.

How should I use Kanamycin eye drops?

Kanamycin eye drops should be used exactly as prescribed by your ophthalmologist. Typically, you will wash your hands, tilt your head back, pull down your lower eyelid, and gently squeeze the prescribed number of drops into the eye. Close your eye gently for a minute or two. Avoid touching the dropper tip to your eye or any surface.

Do I need a prescription for Kanamycin?

Yes, Kanamycin is a prescription medicine. It should only be used as directed by a qualified ophthalmologist and never self-medicated.

What precautions should I take while using Kanamycin?

Always use Kanamycin under the guidance of an ophthalmologist. Inform your doctor about any other medications you are taking. Do not self-medicate or reuse old prescriptions. If you experience any unusual side effects or if your condition worsens, contact your doctor immediately.

References

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.