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Generic Name: gentamicin ophthalmic (JEN ta MYE sin off THAL mik)
Brand Name: Gentak
Physician reviewed Gentak patient information - includes Gentak description, dosage and directions.
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Drug Information:
Gentamicin is an antibiotic that fights bacteria. Gentak (for the eyes) is used to treat bacterial infections of the eyes. Gentak may also be used for purposes not listed in this medication guide. Follow all directions on your medicine label and package. Tell each of your healthcare providers about all your medical conditions, allergies, and all medicines you use. You should not use Gentak if you are allergic to gentamicin. a viral or fungal infection in your eye. It is not known whether this medicine will harm an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant. Learn more

Gentak Side Effects

Gentak Side Effects

Note: This document contains side effect information about gentamicin ophthalmic. Some of the dosage forms listed on this page may not apply to the brand name Gentak.

For the Consumer

Applies to gentamicin ophthalmic: ophthalmic ointment, ophthalmic solution

Along with its needed effects, gentamicin ophthalmic (the active ingredient contained in Gentak) may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur while taking gentamicin ophthalmic:

Less common

  • Itching, redness, swelling, or other sign of irritation not present before use of this medicine
  • redness of eye, eyelid, or inner lining of eyelid


  • Black, tarry stools; blood in urine or stools; or unusual bleeding or swelling
  • blurred vision, eye pain, sensitivity to light, and/or tearing
  • seeing, hearing, or feeling things that are not there
  • hallucinations

Some side effects of gentamicin ophthalmic may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

Less common

  • Burning or stinging

After application, eye ointments usually cause your vision to blur for a few minutes.

For Healthcare Professionals

Applies to gentamicin ophthalmic: ophthalmic ointment, ophthalmic solution


Common (1% to 10%): Conjunctival epithelial defects, conjunctival hyperemia, non-specific conjunctivitis, ocular burning, ocular irritation

Frequency not reported: Bacterial corneal ulcer, blurred vision, eye irritation, eye pruritus, fungal corneal ulcer

Postmarketing reports: Eye discharge, eye edema, eye pain, eye swelling, eyelid irritation, eyelid edema, ocular hyperemia


Rare (0.01% to 0.1%): Allergic reactions

Frequency not reported: Sensitivity reactions

Postmarketing reports: Hypersensitivity


Rare (0.01% to 0.1%): Hallucinations


Rare (0.01% to 0.1%): Thrombocytopenic purpura


Frequency not reported: Burning sensation, itching, local sensitivity, stinging sensation, transient irritation


Frequency not reported: Hearing loss, ototoxicity, stinging, vestibular disorder


Frequency not reported: Dermatitis, itching, pruritus


Frequency not reported: Superinfection


Frequency not reported: Acute renal failure, nephrotoxicity

Editorial References and Review

Medically reviewed by BestRx Medical Team Last updated on 1/1/2020.

Source: Drugs.com Gentak