Yes, IV lorazepam (Ativan) must be diluted before intravenous administration.
IV lorazepam requires dilution with an equal volume of compatible solution immediately prior to intravenous use 1. This is a critical safety requirement specified in the FDA drug label.
Dilution Requirements
For Intravenous Administration
- Dilute with an equal volume of compatible solution immediately before IV use 1
- Compatible diluents include 1:
- Sterile Water for Injection, USP
- Sodium Chloride Injection, USP (0.9% normal saline)
- 5% Dextrose Injection, USP
Mixing Technique
- Mix thoroughly by gently inverting the container repeatedly until a homogenous solution results 1
- Do not shake vigorously, as this will result in air entrapment 1
- Inspect visually for particulate matter and discoloration before administration 1
- Do not use if solution is discolored or contains a precipitate 1
Administration Guidelines
Rate of Administration
- The rate of injection should not exceed 2.0 mg per minute 1
- For status epilepticus specifically, give slowly at 2 mg/min 1
Route-Specific Instructions
- IV route: Must be diluted as described above 1
- IM route: Can be given undiluted, injected deep in the muscle mass 1
- The diluted solution may be injected directly into a vein or into the tubing of an existing intravenous infusion 1
Critical Safety Considerations
Why Dilution Matters
The undiluted formulation (2 mg/mL or 4 mg/mL) 1 is too concentrated for direct IV push and requires dilution to:
- Reduce injection site reactions
- Allow for controlled administration rate
- Minimize risk of rapid bolus administration
Common Pitfall
Never administer undiluted lorazepam intravenously. The IM formulation can be given undiluted only when using the intramuscular route 1. Confusion between routes is a medication error risk.
Pediatric Considerations
In pediatric emergencies, lorazepam for status epilepticus is dosed at 0.05-0.10 mg/kg (maximum 4 mg per dose), and the same dilution requirements apply 2. The diluted solution should be given over 2-3 minutes to avoid oversedation 2.