When given as an IM injection, Ativan has a similar onset of action when compared to taking it by mouth, around 15-30 minutes. The peak plasma level of lorazepam from a 2 mg dose is approximately 20 ng/mL." Parental Ativan Onset Of ActionĪtivan can also be administered via intramuscular injection or intravenously and each has a different onset of action. Peak concentrations in plasma occur approximately 2 hours following administration. Per the prescribing information for Ativan tablets: "Ativan (lorazepam) is readily absorbed with an absolute bioavailability of 90 percent. However, peak concentrations in the blood occur after about two hours. Orally, Ativan is rapidly absorbed and will begin working in 15-30 minutes. Can you let me know how fast it works? AnswerĪtivan (lorazepam) is considered a rapid acting benzodiazepine medication, with an intermediate duration of action. I am taking a new medication for anxiety, lorazepam.
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