I foud pills and they are purple and yellow.. capsules.. withe the numbers ST-2 on the purple side and 224 and 3850 on the yellow side. What are they?

Try this site to help you identify the medication

Pill Identification Wizard (http://www.drugs.com/imprints.php?action=search&drugname=&imprint=watson+360&shape=0&color=&I1=Search)