Lorazepam, sold under the brand name Ativan among others, is a benzodiazepine medication. Due to these concerns, lorazepam use is generally only recommended for up to two to four weeks. . To avoid amnesia (or excess sedation) being a problem, the initial total daily lorazepam dose should not exceed 2 medicalcases.eu of action: 1–5 min (IV), 15–30 min (IM). Mar 17, - Lorazepam (Ativan) is used for treating anxiety, insomnia, epilepsy and oral tablets are available in strengths of mg, 1 mg, and 2 mg. May 7, - Lorazepam is also used for anxiety disorder as well as insomnia due to anxiety or stress. Lorazepam 1 mg – 2 mg is used daily in 2 – 3 divided doses, and for insomnia 2 mg – 4 mg at bedtime.