Solubility of injectable Valium in intravenous solutions

Area of Science:

• Pharmacology
• Intravenous drug administration
• Solubility studies

Background:

• Valium (diazepam) is widely used for psychosedation in dentistry.
• Manufacturer advises against adding Valium to IV fluids due to precipitate formation.
• Previous studies showed Valium redissolves in plasma but data on other IV fluids was limited.

Purpose of the Study:

• To investigate Valium solubility in common intravenous solutions.
• To determine the effect of human blood plasma on Valium solubility in these solutions.
• To understand the behavior of Valium precipitates in intravenous admixtures.

Main Methods:

• Valium solubility was tested in 5% dextrose in normal saline, 5% dextrose in water, normal saline, and Ringer's lactate.
• The effect of adding varying percentages of human plasma (in vitro) to these solutions was observed.
• Precipitate formation and resuspension characteristics were analyzed.

Main Results:

• Valium was insoluble in all tested intravenous solutions, forming a precipitate.
• The precipitate readily resuspended when mixed with 39-42% plasma in vitro.
• This suggests in vivo resuspension upon mixing with blood plasma.

Conclusions:

• Valium precipitates in common IV fluids but is resuspended by plasma.
• Slow administration into a running IV is recommended to facilitate plasma mixing.
• This minimizes the risk of circulating particulate matter when administering Valium intravenously.