Not Medical Advice: A small, white, round-shape pill with M 321 imprint has been identified as Lorazepam 0.5 mg.
Lorazepam belongs to the group of drugs called benzodiazepines. This drug affects chemicals in the brain that may become unbalanced and cause anxiety.
Lorazepam is used to treat anxiety, insomnia, panic disorder, cervical dystonia, dysautonomia and more.
Check out tips for Anxiety and Panic Disorder prevention, shared by WebMD.