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Benzodiazepine, Onset of Action2, Peak Onset (hrs), Half-life parent (hrs) Clonazepam1 (Rivotril®), Int. , , -, mg. Lorazepam1 (Ativan®). Int. (po). Mar 10, - Concurrent administration of lorazepam with probenecid may result in a more rapid onset or prolonged effect of lorazepam due to increased. May 20, - Lorazepam (trade name Ativan) is an intermediate-duration Onset, 5 - 30 minutes Lorazepam is a drug of the benzodiazepine class.Chemistry · Pharmacology · Subjective effects · Toxicity and harm potential.