Final answer:
Diazepam, when administered as a continuous infusion, has the potential to cause propylene glycol toxicity.
Step-by-step explanation:
When administered as a continuous infusion, the sedative agent that has the potential to cause propylene glycol toxicity is diazepam. Propylene glycol is used as a solvent in many pharmaceuticals, including diazepam, which is insoluble in water. Therefore, when diazepam is administered intravenously as a continuous infusion, propylene glycol toxicity can occur.