May 7, - The extended release alprazolam or Xanax XR is mg – 1 mg twice a day. 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. Lorazepam is in a group of drugs called benzodiazepines and is used to treat anxiety disorders. Learn about side effects, interactions and indications. Mar 17, - Lorazepam oral tablets are available in strengths of mg, 1 mg, and 2 mg. Your doctor may prescribe lorazepam to be taken 2 to 3 times a day for conditions such as anxiety, or once daily for conditions such as insomnia. When you first start lorazepam, your doctor may slowly increase your dose to avoid side effects.