What is Gentak: Uses, Warnings & Interactions

Updated May 14, 2025  •  Published Dec 30, 2020

Gentak overview

BRAND NAMES:

  • Gentak, Genoptic, Gentak

Generic Names:

  • Gentak

Uses:

  • Treats eye infections. Belongs to a class of drugs called antibiotics.

Therapeutic Classes:

  • Antibiotic

Forms:

  • Ointment, Drop

How it’s taken:

  • Into the eye

What is Gentak used for?

Gentak is an antibiotic that is used to treat patients with eye conditions associated with bacteria including conjunctivitis and blepharitis. Gentak works by reducing inflammation in or around the infected eye area. This medication is available as an ophthalmic ointment ophthalmic solution.

What form(s) does Gentak come in

  • Ointment

  • Drop

What are common Gentak doses?

  • Tube 3.5GM of 0.3%

Common Gentak prescriptions

  • Gentak
    3.5gm of 0.3% tube of ointment

How to take Gentak

  • Your doctor will tell you how much of this medicine to use and how often. Do not use more medicine or use it more often than your doctor tells you to. This medicine is not for long-term use.

  • Wash your hands before and after using the medicine.

  • Shake the eye drops well just before each use.

  • Lie down or tilt your head back. With your index finger, pull down the lower lid of your eye to form a pocket.

  • To use the eye drops: Hold the dropper close to your eye with the other hand. Drop the correct number of drops into the pocket made between your lower lid and eyeball. Gently close your eyes. Place your index finger over the inner corner of your eye for 1 minute. Do not rinse or wipe the dropper or allow it to touch anything, including your eye. Put the cap on the bottle right away. Keep the bottle upright when you are not using it.

  • To use the ointment: Hold the tip of the tube close to your eye with the other hand. Avoid touching the tip of the tube to your eye or finger. Squeeze a ribbon of ointment into the pocket between your lower lid and eyeball. Close your eyes for 1 to 2 minutes. Wipe the tip with a clean tissue and close the tube tightly. Keep the tube tightly closed when you are not using it.

  • Lie down or tilt your head back. With your index finger, pull down the lower lid of your eye to form a pocket.

  • Shake the eye drops well just before each use.

  • To use the ointment: Hold the tip of the tube close to your eye with the other hand. Avoid touching the tip of the tube to your eye or finger. Squeeze a ribbon of ointment into the pocket between your lower lid and eyeball. Close your eyes for 1 to 2 minutes. Wipe the tip with a clean tissue and close the tube tightly. Keep the tube tightly closed when you are not using it.

  • To use the eye drops: Hold the dropper close to your eye with the other hand. Drop the correct number of drops into the pocket made between your lower lid and eyeball. Gently close your eyes. Place your index finger over the inner corner of your eye for 1 minute. Do not rinse or wipe the dropper or allow it to touch anything, including your eye. Put the cap on the bottle right away. Keep the bottle upright when you are not using it.

  • Your doctor will tell you how much of this medicine to use and how often. Do not use more medicine or use it more often than your doctor tells you to. This medicine is not for long-term use.

  • Wash your hands before and after using the medicine.

What to do if you miss a dose of Gentak

  • Do not use extra medicine to make up for a missed dose.

  • If you miss a dose or forget to use your medicine, use it as soon as you can. If it is almost time for your next dose, wait until then to use the medicine and skip the missed dose.

Gentak contraindications

  • You should not use this medicine if you have had an allergic reaction to gentamicin or to related medicines, such as Tobrex®.

Gentak warnings

  • Check with your doctor if your condition gets worse or does not get better while using gentamicin.

Gentak interactions

  • Make sure your doctor knows if you are using any other products for the eye.

Gentak side effects

Serious Side Effects

  • Blurred vision is common for the first few minutes after using. If it continues, talk with your doctor.

  • Eye irritation that was not there before using the medicine

Less Serious Side Effects

  • Burning or stinging of the eye, tearing

  • Blurred vision is common for the first few minutes after using. If it continues, talk with your doctor.