A round white pill with a double score line on one side and BP 633 on the other. What is it?

Not Medical Advice: Pill imprint BP 633 has been identified as Alprazolam 2 mg. It belongs to the drug class benzodiazepines.

Tags: bpalprazolam 
Monday, February 06 2012
Source: http://www.drugs.com/imprints/bp-633-16613.html