Gentamicin injection is an aminoglycoside antibiotic given by IV or deep IM injection. It’s used for serious infections caused by susceptible bacteria (often Gram-negative bacteria) and is typically administered in a hospital setting with careful dosing and monitoring.
Key points
- Indications: serious infections such as sepsis, pneumonia, intra-abdominal infections, urinary tract infections, gynecologic infections, and some postoperative infections. It’s usually used in combination with another antibiotic for broader coverage or synergy, and dosing depends on the infection and bacterial susceptibility.
- How it’s given: IV infusion or deep IM injection. Dosing is tailored to the individual and is usually adjusted for kidney function.
- Dosing (very general guidance; actual doses must be prescribed by a clinician):
- Conventional (divided-dose) regimen: roughly 3–5 mg/kg per day, given in 2–4 divided doses (e.g., every 8–12 hours). The exact amount per dose depends on weight and renal function.
- Once-daily (extended-interval) regimen: often around 7 mg/kg once daily, with dose adjustments based on renal function and therapeutic drug monitoring.
- Important: Dosing must be individualized for each patient. Do not use without clinician oversight.
- Monitoring and safety:
- Therapeutic drug monitoring: measure peaks (after the end of a dose) and troughs (before the next dose) to balance effectiveness with toxicity risk.
- Targets vary by regimen, but generally troughs are kept low to minimize toxicity (nephrotoxicity and ototoxicity risk).
- Monitor kidney function (creatinine, urine output) and hearing/balance (tinnitus, dizziness, hearing loss) since gentamicin can cause kidney and inner-ear toxicity, especially with longer courses or higher doses.
- Be cautious with other drugs that affect kidneys or ears (e.g., NSAIDs, certain diuretics, other aminoglycosides, loop diuretics, cisplatin).
- Warnings and contraindications:
- Pregnancy: Generally categorized as risk in pregnancy; use only if clearly needed and after weighing benefits/risks.
- Hypersensitivity to aminoglycosides.
- Avoid or monitor closely with kidney disease or dehydration.
- Potential interactions with other nephrotoxic or ototoxic drugs.
- Side effects:
- Common: injection-site reactions, nausea, vomiting, rash.
- Serious: nephrotoxicity (kidney injury), ototoxicity (hearing/vestibular damage), neuromuscular blockade, allergic reactions.
- Practical notes:
- Reconstitution/storage: follow the product label. Typically prepared by pharmacy and administered by healthcare professionals.
- Do not self-administer or adjust the dose without medical supervision.
If you’re looking for something specific (for example, a starting dose for a particular infection, dosing adjustments for kidney impairment, expected peak/trough targets, or information about a product you have), tell me the details (age/weight, kidney function, infection type, and whether you’re following a particular regimen). I can tailor the guidance or help interpret your prescription.