Have you noticed your eye turning red, feeling itchy, or building up crust throughout the day? You might even feel like something small is trapped underneath your eyelid. These annoying symptoms can happen for several different reasons. Sometimes a bacterial or viral germ causes the trouble. But fungi can also infect your eyes and cause serious discomfort.
Today, we will talk about a special medicine used to treat these fungal eye infections. That medicine is called Natamycin. Understanding how it works will help you take better care of your vision and heal faster.
Key Takeaways
- Natamycin is an antifungal medicine designed specifically to treat fungal infections inside the eye.
- It does not work against bacterial or viral eye infections.
- Always shake the bottle well before putting the drops into your eye.
- Complete the entire course of medicine even if your eye feels completely better.
- Never share your eye drop bottle with anyone else to prevent spreading germs.
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What Kind of Medicine Is Natamycin?
Simply put, Natamycin is an antifungal medicine. Doctors use it to treat specific fungal infections that affect the tissues of the eye. One extremely important thing to understand is that this medicine does not work at all on bacteria or viruses.
Think about the different keys in your house. You cannot open your front door with a key meant for your back door. Natamycin works the exact same way. It is built strictly to cure fungal infections. Your doctor will only prescribe this medicine after confirming that a fungus caused your eye problem.
Things to Tell Your Doctor Before Using This Medicine
Before you start using Natamycin, your doctor needs a complete picture of your health. Make sure you share the following details if they apply to you:
- You have allergies to Natamycin, other medicines, foods, or dyes.
- You currently have another infection, especially a viral illness like chickenpox or herpes.
- You wear contact lenses regularly.
- You are pregnant or planning to become pregnant soon.
- You are a nursing mother breastfeeding a baby.
Giving your doctor this vital information helps keep your treatment safe and effective.
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Now, let us review how to put these drops into your eye properly. Following these simple steps ensures you get the best medical results.
1. Wash your hands: Always wash your hands thoroughly with soap and water before and after putting in your drops.
2. Shake the bottle: This step is very important. Shake the medicine bottle well before every single use.
3. Tilt your head back: Sit comfortably on a chair or lie down, and tilt your head back gently.
4. Pull your lower lid down: Use your index finger to gently pull your lower eyelid down to create a small pocket.
5. Apply the drops: Keep the dropper tip away from your eye, fingers, or any other surface to avoid contamination. Place the exact number of drops prescribed into the pocket.
6. Close your eye: After putting the drops in, close your eye gently and keep it shut for a moment. This helps the medicine spread across the surface.
7. Expect blurry vision: Your vision may become slightly blurry for a few minutes right after application. This is completely normal.
8. Follow your schedule: Use the drops precisely at the times and intervals recommended by your doctor.
9. Finish the full course: This step is extremely important. Even if your eye feels better, use the medicine for every single day your doctor prescribed. Stopping early can let the infection return.
What If You Miss a Dose?
If you forget to use your drops at the scheduled time, put them in as soon as you remember. However, if it is almost time for your next scheduled dose, skip the missed one entirely. Never use a double dose to make up for a missed one.
What If You Use Too Much?
If you accidentally put too many drops in your eye, or if someone swallows the liquid by mistake, do not panic. Contact your local poison control center right away (call 911 in the US or 999 in the UK if an emergency occurs), or go straight to the nearest hospital Emergency Department.
Sensitivity to Light
Some people find their eyes become sensitive to light while using this medicine. Bright sunlight or indoor bulbs might make your eyes feel uncomfortable. If this happens, wear comfortable sunglasses whenever you step outside.
Understanding Side Effects
Like all medicines, Natamycin can cause side effects, though not everyone experiences them. Review the table below to understand which reactions need quick medical attention.
| Side Effect Category | Description and Action to Take |
|---|---|
| Severe Allergic Reactions | Skin rashes, itching, swelling of the face, lips, or tongue. Stop using the drops and contact your doctor right away. |
| Vision Changes | Blurry vision that does not go away quickly or other unusual vision shifts. Call your doctor right away. |
| Severe Eye Pain | Sharp or persistent pain in the eye. Never ignore this symptom. |
| Intense Burning or Swelling | Unbearable stinging or noticeable swelling of your eyelids. Report this to your doctor. |
| Temporary Blur | Mild blurring for a few minutes right after putting drops in. This is normal. |
| Mild Stinging or Redness | A brief moment of redness or mild stinging right after application. This fades fast. |
| Watery Eyes | Extra tear production right away following the drop. This is normal. |
When to Call the Doctor / Emergency Red Flags
If your eye infection does not improve after 7 to 10 days of treatment, or if it gets progressively worse, contact your doctor right away. Seek emergency medical care (call 911 or 999) if you experience sudden vision loss, severe eye trauma, unbearable pain, or signs of a serious allergic reaction.
How to Store This Medicine Properly
To keep your medicine effective and safe to use, proper storage is essential:
- Keep away from children: Store this medicine in a secure cabinet out of the reach of young children.
- Temperature control: Keep the bottle at room temperature or inside a refrigerator (between 2°C and 24°C / 36°F to 75°F). Never freeze the medicine or let it turn to ice.
- Protect from light: Keep the bottle away from direct sunlight or bright window sills.
- Discard after expiration: Check the expiration date printed on the bottle and throw away any leftover medicine once that date passes.
While managing an eye infection, never share your towels, facecloths, or pillowcases with other family members. Similarly, never let anyone else use your eye drop bottle. Taking these precautions stops infections from spreading through your household.
Sources & References:
- Cleveland Clinic. (2025). Fungal Eye Infections and Treatment Guidelines.
- Mayo Clinic. (2025). Natamycin Ophthalmic Suspension: Uses and Side Effects.
- National Health Service (NHS). (2025). Eye Infections and Antifungal Treatments.
- Centers for Disease Control and Prevention (CDC). (2024). Fungal Keratitis and Prevention.
- National Institutes of Health (NIH) / PubMed. (2024). Efficacy of Natamycin Suspension in Ophthalmic Mycoses.
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