what is a small blue round pill with the inscription 2531 on one side and a v on the other side?

Not medical advice: Pill imprint 2531 V has been identified as Clonazepam 1 mg. It is used in the treatment of anxiety; bipolar disorder; panic disorder;

Sunday, February 05 2012
Source: http://www.drugs.com/imprints/2531-v-13540.html