I found a pill that is light blue, has six unequal sides and the letters MSD over the number 72. What is it?

The best thing that you can do is take the pill to a pharmacist for identification or use a site such as the following for the identification of the pill. Pill Identifier - Drugs.com The site referenced is not fool proof but good.

Does it look like this?


http://gsm.about.com/photos/photo_us_h/001/pros001t.jpg