Gentamicin: uses, side effects & brands

Written & medically reviewed by Dr. Sanjay Anbu, MBBS · Last reviewed 5 November 2026

Gentamicin is an aminoglycoside for serious infections and some eye/skin uses. It belongs to the Hospital / strong antibiotic (injectable) group. These powerful antibiotics are used in hospital for serious or resistant infections.

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Drug type — dosing is set by your doctor

Measure	Range
Drug class	Hospital / strong antibiotic (injectable)
Type	Prescription
Dose	Individual — ask your doctor or pharmacist

What it is used for

Treats serious bacterial infections, often with another antibiotic
Used for severe infections in newborns and for some heart-valve infections
Eye and ear drops treat local bacterial infections
Skin cream treats some infected skin conditions

Common brand names

India: Genticyn, Garamycin
Worldwide: Garamycin

Common side effects

Hearing loss or ringing in the ears (with injections)
Dizziness or balance problems
Reduced kidney function
Stinging or irritation with drops or cream

Before taking it — precautions

Injection: kidney function and blood levels are monitored
Tell your doctor about kidney, hearing or balance problems, or myasthenia gravis
Avoid in pregnancy unless essential; ear drops are not used if the eardrum is perforated unless a specialist advises

When to see a doctor urgently

Ringing in the ears, hearing change or spinning dizziness (urgent)
Much less urine or leg swelling
Allergic reaction such as swelling or severe rash (urgent)

Not a prescription — no dose shown. The right dose of gentamicin depends on age, weight, kidney/liver function and the condition, so MedDroid does not show a dose here. Always get your dose from a doctor or pharmacist and the leaflet inside the pack. General educational information only.

Frequently asked questions

Why are blood tests needed with gentamicin injection?

Levels that are too high can damage the kidneys and inner ear, so tests keep treatment safe.

Are the eye drops risky like the injection?

Very little is absorbed from drops, so the hearing and kidney risks mainly apply to the injection.

How long is it usually given?

Injections are usually kept short to reduce side effects; your doctor decides the duration.

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Sources & further reading

Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.