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Gentak (Generic Gentamicin Ophthalmic)

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Why is this medication prescribed?

Gentak, which contains the active ingredient gentamicin, is prescribed for the treatment of bacterial infections of the eyes. It is particularly effective against certain types of bacteria such as Staphylococcus aureus, Escherichia coli, Klebsiella pneumoniae, and Pseudomonas aeruginosa.

Gentak solution and eye ointment are used to treat bacterial conjunctivitis (commonly known as pink eye) and other bacterial infections of the eye.

How should this medicine be used?

Here’s how Gentak is typically used:

  • Wash your hands: Before applying Gentak, it’s essential to wash your hands thoroughly with soap and water to prevent contamination.
  • Remove contact lenses: If you wear contact lenses, remove them before applying Gentak. Contact lenses should typically not be worn during the treatment of an eye infection unless directed by your doctor.
  • Application: For the solution, tilt your head back and pull down your lower eyelid to create a small pocket. Hold the dropper directly over your eye and place the prescribed number of drops into the pocket. Close your eyes gently and apply slight pressure to the inner corner of your eye with your finger for about 1-2 minutes. This helps to prevent the solution from draining into your tear duct.For the eye ointment, pull down your lower eyelid to create a small pocket. Squeeze a thin strip (about 1/2 inch or 1 centimeter) of ointment into the pocket. Close your eyes gently and roll your eyeball around to spread the ointment evenly over the eye. Blink several times to distribute the ointment across the eye’s surface.
  • Avoid touching the tip: Be careful not to touch the tip of the dropper or the tube to your eye or any other surface to avoid contamination.
  • Replace the cap: After application, securely replace the cap on the solution bottle or tube to prevent contamination and to keep the medication sterile.
  • Dosage and frequency: Follow your doctor’s instructions regarding the dosage and frequency of Gentak. Do not stop using the medication unless instructed by your doctor, even if your symptoms improve.
  • Duration of treatment: Use Gentak for the full prescribed duration, even if your symptoms improve before the medication is finished. Stopping the medication too early may allow the infection to return or worsen.
  • Contact your doctor: If you experience any severe or persistent side effects, or if your symptoms do not improve within a few days of starting Gentak, contact your doctor for further guidance.

Other uses for this medicine

Some potential off-label uses for Gentak may include:

  • Corneal ulcers: Gentak may be prescribed to treat bacterial corneal ulcers, which are open sores on the cornea caused by bacterial infection.
  • Prevention of eye infections: In some cases, Gentak may be used prophylactically to prevent eye infections, particularly in individuals who are at high risk due to certain medical conditions or procedures.

What special precautions should I follow?

Regarding special precautions for using Gentak, here are some important points to consider:

  • Allergic reactions: Inform your doctor if you have a known allergy to gentamicin or any other ingredients in Gentak. Allergic reactions to Gentak can manifest as itching, redness, swelling, or difficulty breathing. If you experience any of these symptoms, discontinue use and seek medical attention immediately.
  • Contact lenses: If you wear contact lenses, remove them before applying Gentak. Contact lenses should typically not be worn during the treatment of an eye infection unless directed by your doctor.
  • Pregnancy and breastfeeding: Inform your doctor if you are pregnant, planning to become pregnant, or breastfeeding before using Gentak. While Gentak is generally considered safe to use during pregnancy and breastfeeding when necessary, your doctor will weigh the potential risks and benefits before prescribing it.
  • Avoid contamination: To prevent contamination and the spread of infection, avoid touching the tip of the dropper or the tube to your eye or any other surface. Keep the bottle or tube tightly closed when not in use.
  • Follow dosage instructions: Use Gentak exactly as prescribed by your doctor. Do not use more or less of it or use it more frequently than directed.
  • Medical history: Inform your doctor about your complete medical history, including any other eye conditions, ongoing treatments, or allergies, before using Gentak.
  • Other medications: Inform your doctor about any other medications, supplements, or herbal remedies you are currently taking, as they may interact with Gentak.
  • Adverse reactions: If you experience any severe or persistent side effects while using Gentak, such as eye irritation, blurred vision, or eye pain, contact your doctor for further guidance.

Always follow your doctor’s instructions and recommendations for using Gentak to ensure its safe and effective use.

What special dietary instructions should I follow?

Special dietary instructions are typically not necessary when using Gentak. However, if you have any concerns about diet and medication interactions, it’s best to consult your doctor or pharmacist for personalized advice.

What should I do if I forget a dose?

If you forget to use a dose of Gentak, apply it as soon as you remember. However, if it is almost time for your next dose, skip the missed dose and continue with your regular dosing schedule. Do not double the dose to catch up. If you are unsure about what to do, contact your doctor or pharmacist for guidance. It’s important to maintain a consistent dosing schedule to ensure the effectiveness of the medication.

What side effects can this medication cause?

Gentak may cause side effects, although not everyone will experience them. Common side effects of Gentak may include:

  • Eye irritation or burning sensation
  • Itching or redness of the eyes
  • Blurred vision
  • Sensitivity to light (photophobia)
  • Eye discomfort or pain
  • Eyelid swelling or inflammation
  • Excessive tearing
  • Dry eyes
  • Allergic reactions, such as rash, hives, or swelling of the face, lips, tongue, or throat (seek immediate medical attention if you experience these symptoms)
  • Secondary fungal or bacterial infections of the eye
  • Contact dermatitis or skin irritation around the eyes

These are not all the possible side effects of Gentak. If you experience any other unusual or bothersome symptoms while using Gentak, contact your doctor or pharmacist for further evaluation and advice. Additionally, if you notice any severe or persistent side effects, seek medical attention promptly. It’s essential to report any adverse reactions to your healthcare provider, as they can help determine the best course of action.

What should I know about storage and disposal of this medication?

Storage and disposal of Gentak:


  • Store Gentak solution and eye ointment at room temperature between 15°C to 30°C (59°F to 86°F).
  • Keep the medication tightly closed and away from moisture, heat, and light.
  • Do not freeze Gentak.
  • Keep Gentak out of the reach of children and pets.


  • Dispose of Gentak solution and eye ointment properly according to local regulations or guidelines.
  • Do not flush Gentak down the toilet or pour it down the drain unless instructed to do so.
  • If you have unused or expired Gentak, consult your pharmacist or local waste disposal company on how to properly dispose of it.

In case of emergency/overdose

  • In case of accidental ingestion of Gentak solution or eye ointment, contact your local poison control center or go to the nearest emergency room immediately.
  • Symptoms of overdose may include severe eye irritation, redness, pain, and vision changes.
  • Do not induce vomiting unless instructed to do so by medical personnel.

What other information should I know?

  • Follow all instructions provided by your doctor or pharmacist regarding the use of Gentak.
  • Do not share Gentak with others, even if they have similar symptoms, as it may not be suitable for their condition.
  • Attend all follow-up appointments with your doctor to monitor your progress and response to treatment.
  • Keep Gentak and all medications out of reach of children and pets.
  • Inform your doctor if you experience any unusual or severe side effects while using Gentak.

If you have any further questions or concerns about Gentak, do not hesitate to discuss them with your healthcare provider or pharmacist.

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