Amiject 500 in asthmaric patients safe use dose route
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Amiject 500 amikacin injection asthma patients safety dose route
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Amiject 500 (Amikacin Sulfate 500 mg Injection) in Asthmatic Patients
What is Amiject 500?
Amiject 500 is an amikacin sulfate injection (aminoglycoside antibiotic, 500 mg/2 mL = 250 mg/mL). It is used for serious bacterial infections where other antibiotics may fail.
Safety in Asthmatic Patients - KEY WARNING
USE WITH CAUTION in asthma. The reason is not the drug itself, but the preservative: sodium metabisulfite (0.66%), which is present in every vial.
- Sodium metabisulfite can trigger bronchospasm and allergic reactions in sulfite-sensitive individuals - a well-known risk in asthmatic patients.
- Mayo Clinic's drug monograph explicitly lists asthma and sulfite allergy as conditions requiring caution before use.
- Asthma is also listed as a precautionary condition by eMPR due to this sulfite content.
Practical guidance:
- Inform the physician of asthma history before administration.
- Have bronchodilators and emergency equipment available if it must be used in a known sulfite-sensitive asthmatic.
- Avoid if there is a known history of sulfite allergy or severe sulfite-sensitive asthma, unless the benefit clearly outweighs the risk.
Dose
| Patient Group | Dose | Frequency |
|---|---|---|
| Adults & children >12 yr (normal renal function) | 15 mg/kg/day (i.e., 7.5 mg/kg every 12 hr, or 5 mg/kg every 8 hr) | Divided doses |
| Maximum daily dose | 1.5 g/day (in heavier patients) | - |
| Uncomplicated UTI (adults) | 250 mg twice daily | Every 12 hr |
| Neonates (loading) | 10 mg/kg, then 7.5 mg/kg every 12 hr | - |
| Premature infants | 7.5 mg/kg every 12 hr | - |
| Usual duration | 7-10 days | - |
- Total daily dose should not exceed 15 mg/kg/day.
- Reduce dose or extend intervals in renal impairment (dose-adjust based on creatinine clearance or serum levels).
Route of Administration
| Route | Details |
|---|---|
| Intramuscular (IM) | Preferred for most infections; direct injection |
| Intravenous (IV) infusion | For life-threatening infections or when IM is not feasible; infuse over 30-60 minutes in 100-200 mL NS or 5% Dextrose |
| IV slow bolus | Over 2-3 minutes (less preferred) |
- Do NOT give rapid IV push - increases risk of neuromuscular blockade.
- Once diluted, the IV solution must be used immediately (do not store).
Serum Level Monitoring
To avoid toxicity, monitor serum amikacin levels:
- Peak (30-90 min post-dose): should not exceed 35 mcg/mL (except with once-daily dosing)
- Trough (just before next dose): should not exceed 10 mcg/mL
Key Toxicities to Monitor (all patients)
- Nephrotoxicity - monitor BUN, serum creatinine, creatinine clearance before, during, and after therapy.
- Ototoxicity (auditory and vestibular) - more common in elderly and neonates; perform audiogram in high-risk patients.
- Neuromuscular blockade - caution in myasthenia gravis, Parkinson's, or patients on muscle relaxants.
Summary
Amiject 500 is not outright contraindicated in asthma, but it must be used with caution due to the sodium metabisulfite preservative, which can provoke bronchospasm in sulfite-sensitive asthmatics. Always assess asthma severity and sulfite sensitivity before administration, and have rescue bronchodilators on hand. Dose and route remain the same as for non-asthmatic patients unless renal impairment coexists.
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