Lorazepam Administration in Normal Saline
Yes, lorazepam can and must be diluted with normal saline (0.9% sodium chloride) for intravenous administration. 1
FDA-Mandated Dilution Requirements
The FDA drug label explicitly states: "Immediately prior to intravenous use, lorazepam injection must be diluted with an equal volume of compatible solution" 1. Normal saline (0.9% sodium chloride injection, USP) is specifically listed as one of three compatible dilution solutions, along with sterile water for injection and 5% dextrose injection 1.
Preparation Protocol
- Dilute 1:1 with equal volume of normal saline before IV administration
- Mix thoroughly by gently inverting the container repeatedly until homogenous
- Do not shake vigorously as this causes air entrapment
- Once diluted, may inject directly into vein or into tubing of existing IV infusion
- Maximum injection rate: 2 mg per minute 1
Clinical Context and Compatibility
Normal saline is the preferred diluent in most emergency situations because it avoids complications associated with dextrose solutions in certain patient populations (e.g., hyperglycemia concerns) and is universally compatible 2. The anaphylaxis guidelines specifically recommend normal saline for IV access and fluid replacement when benzodiazepines may be needed 2.
Stability Considerations
Research demonstrates that lorazepam maintains adequate solubility in normal saline (0.027 mg/ml) and exhibits minimal sorption to PVC delivery systems when properly diluted 3. At appropriate dilution ratios, at least 90% of initial concentration is maintained for 5 hours in standard IV delivery systems 3.
Critical Safety Points
- Never administer undiluted IV lorazepam - this violates FDA labeling and increases risk of adverse events
- Verify dilution is complete before administration to avoid pain at injection site
- Monitor for signs of intra-arterial injection or perivascular extravasation - stop immediately if patient complains of pain during injection 1
- Have airway management equipment immediately available, as respiratory depression can occur regardless of dilution 1
The requirement for normal saline dilution is non-negotiable for IV lorazepam administration and is supported by both FDA labeling and clinical practice guidelines 4, 1.