Gentamicin belongs to a class of medications called aminoglycoside antibiotics. It works by inhibiting the growth of bacteria and is used to treat a wide variety of bacterial infections. It does not work for virus or fungus infections. Topical Gentamicin may be used for skin and eye infections. It can also be given by injections to treat systemic and severe bacterial infections.
Gentamicin is often used in combination with corticosteroids, such as Betamethasone, to treat skin infections.
Gentamicin is available in many different products that can be used on the skin, in the eye, or in the outer ear. Wash your hands before and after applying this medication.
The following dosage applies to both children and adults. Your doctor will advise you on the frequency of application depending on your infection.
Bacterial eye infections
Eye drops: Frequency of eye drops depends on the severity of the infection. For severe infections, apply 1 drop at least every 2 hours; for less severe infections, 3-4 times daily is generally sufficient. Frequency should be reduced as infection is controlled and continues for 48 hours after healing.
Otitis externa (outer ear infections)
Ear drops: Apply 2-3 drops 4-5 times daily, including a dose at bedtime.
Bacterial skin infections
Cream or ointment: Apply gently to cleansed affected areas 3-4 times daily.
Common side effects of Gentamicin include tinnitus (if applied in the ear). skin irritation or allergic contact dermatitis (if applied topically).
Common dosing schedule:
Your doctor will advise you on the frequency of application depending on your infection.
Some common medications Gentamicin may interact with:
Please notify your doctor or pharmacist if you are taking the above medication, dosage adjustments might be needed.
In Hong Kong, Gentamicin is a prescription only medicine, and requires a prescription from a doctor to be purchased in a pharmacy. It can also be obtained from doctors. To find a pharmacy near you, refer to the list of pharmacies (“Authorized Sellers of Poisons”) from the Hong Kong Department of Health.
For more information about drug names and ingredients, you can visit Hong Kong’s Drug Office at https://www.drugoffice.gov.hk
Need more information?
For detailed information about the use of Gentamicin in children, pregnancy and breastfeeding, and for questions about drug interactions, please check with your pharmacist or doctor.
Disclaimer: our goal is to provide you with the most relevant drug information and common dosage for Hong Kong. This information does not constitute medical advice. For specific treatment recommendations and advice, always discuss with your doctor or pharmacist, and follow the instructions included with your specific medicine.