Nov 13, - Comparison of Ativan (Lorazepam) vs Xanax (Alprazolam): medical uses, side The strengths of Ativan tablets are mg, 1 mg and 2 mg. Oct 17, - Ativan (lorazepam) and Xanax (alprazolam) are both used to treat anxiety and To facilitate this, mg, 1 mg, and 2 mg tablets are available. Jun 3, - A commonly cited double-blind trial suggests a conversion of 1 mg IV lorazepam to 2 mg of IV midazolam, which is further supported using a.