I found a white round pill with a V on one side and 3973 on the other what is this?

Not Medical Advice: A white, round pill with the imprint 3973 on the front, and a fancy V on the back is 20mg of Lisinopril (made by Vintage Pharmaceuticals). Lisinopril can be used to treat Coronary Artery Disease, High Blood Pressure, Diabetic Kidney Disease, and Heart Failure, among other illnesses. This prescription-only medication may be dangerous to use during pregnancy, use only under a doctor's supervision.

Sunday, February 05 2012
Source: http://www.drugs.com/imprints/3973-v-16135.html