1 What is Natacyn?

Brand: Natacyn

Generic: Natamycin

Natacyn is an antifungal used in treating certain types of fungal infections in the eye. A prescription drug, Natacyn can only be obtained with your doctor’s prescription.

2 What to Know Before Using

Before using Natacyn, you must know all about the risks and complications associated with it.

Before using Natacyn, you and your doctor must consider the following:

  • Allergies: If you have any unusual reaction to any medicine, be sure to tell your doctor about it. Additionally, disclose other types of allergies - foods, preservatives, animals, or dyes, if there are any. Read the package ingredients carefully and make sure you are not allergic to any of its ingredients.
  • Pediatric: There are no specific studies done to determine safety and efficacy of use in children.
  • Geriatric: No specific information is provided about the use of this medicine in the elderly. It is not determined if the medicine works exactly the same way as it does in younger adults.
  • Pregnancy: Animal studies show adverse effects in the unborn fetus.
  • Breastfeeding: Although there are no adequate studies in lactating mothers that determine potential risk in an infant when breastfeeding, the benefits should be weighed against the risks before taking this medication.
  • Drug Interactions: Some drugs have adverse effects when used together. Make sure to inform your doctor about other drugs you are taking, so that alterations and precautions will be made if necessary.Before using natamycin, talk to your doctor about possible interactions if you are taking other medications. It is also important to inform your doctor if you are smoking tobacco or drinking alcohol since these may interact with the drug’s effectiveness. Inform your doctor about any drug you are using, prescription or nonprescription, as well as vitamin and herbal supplement.

3 Proper Usage

To use Natacyn properly, you must follow all instructions given by your doctor. Wash hands thoroughly before application. Tilt back your head and pull the lower eyelid away from the eye, forming a pouch.

Drop the solution into the pouch and close your eyes gently. Close your eyes and using your finger, apply pressure to the inner corner of the eye to allow proper medicine absorption. Do not blink.

Wash hands immediately after application. Keep your eye drops germ-free by making sure the applicator tip never touch any surface, including your eyes. Cover the container and keep it tightly closed. Do not increase or lessen the dosage. Follow the dosage as prescribed by your doctor.


Follow your doctor’s orders when it comes to dosage. The following information is only for the average dosage of this drug. The number of doses, the number of hours between doses, and how long you will take this drug depend on your health condition, your progress, and how well you react to this medicine.

The dosage of natamycin depends on the patient. Follow your doctor’s instructions or the directions found on the label. For fungal infection of the eye in adults, apply one drop every 4-6 hours. Your doctor may adjust dosage, especially on more serious infections. Use in children must be determined by the doctor.

Missed Dose

Apply the missed dose as soon as possible. In case it is almost time for the next dose, skip the missed one and follow your regular dosing schedule. Never take double doses.


Keep the medicine in an airtight container at normal room temperature. Keep it away from direct light, heat, and moisture. Do not let it freeze. Keep the medicine out of children’s reach.

4 Precautions to Take

Before using Natacyn, there are some precautions you must take. Regular visits to the doctor must be done to check your progress and see if the medicine is working properly.

This means you may have to visit your doctor a few times in one week. If after 7-10 days, your symptoms do not improve or have become worse, consult your doctor.

5 Potential Side Effects

Make sure you meet with your doctor in using Natacyn to avoid unwanted potential side effects. While not all people using this medicine may suffer from side effects, you may need to call your doctor if any of the effects become more bothersome, or do not subside after 24 hours.

Some of the side effects may take place and may not need special medical attention and usually go away as the body adjusts to the medicine during treatment. If you want to report side effects, you may do so by calling the FDA at 1-800-FDA-1088.