No, Do Not Dilute Amikacin in Distilled Water
Amikacin should be diluted in sterile isotonic solutions such as 0.9% sodium chloride or 5% dextrose injection—never in distilled water. Using distilled water for intravenous administration poses serious risks including hemolysis, cellular damage, and potentially fatal complications from hypotonic fluid administration.
Appropriate Diluents for Intravenous Amikacin
The FDA-approved drug label explicitly specifies acceptable diluents for amikacin intravenous administration 1:
Approved sterile diluents include:
- 0.9% sodium chloride injection
- 5% dextrose injection
- 5% dextrose and 0.2% sodium chloride injection
- 5% dextrose and 0.45% sodium chloride injection
- Lactated Ringer's injection
- Normosol® M in 5% dextrose injection
- Normosol® R in 5% dextrose injection
Standard Preparation Protocol
For intravenous use, add the contents of a 500 mg amikacin vial to 100 or 200 mL of sterile diluent (from the approved list above) 1. The solution should be administered over 30-60 minutes in adults, with infants receiving 1-2 hour infusions.
Stability and Concentration Guidelines
Amikacin sulfate remains stable for 24 hours at room temperature at concentrations of 0.25 to 5 mg/mL in the approved solutions 1. Solutions can also be frozen at -15°C for 30 days, then thawed and stored at 25°C with 24-hour utility times.
Special Considerations for Ophthalmic Use
The only context where distilled water appears in amikacin preparation is for topical ophthalmic formulations, where the intravenous 40 mg/mL formulation can be used directly, or colistin is diluted in distilled water for eye drops 2. This is fundamentally different from systemic intravenous administration.
Critical Safety Warning
Distilled water is hypotonic and lacks electrolytes, making it inappropriate for intravenous drug dilution. Intravenous administration of hypotonic solutions can cause:
- Red blood cell lysis (hemolysis)
- Cellular swelling and damage
- Electrolyte imbalances
- Potential cardiovascular complications
The drug label's explicit listing of isotonic and near-isotonic solutions reflects the physiologic necessity of maintaining appropriate osmolarity for safe intravenous administration 1.
Practical Implementation
Always verify the diluent before preparation. If only distilled water is available, do not proceed with dilution—obtain appropriate sterile isotonic diluent. The aminoglycoside should not be physically premixed with other drugs and must be administered separately according to recommended dosing and route 1.