I have some pills in an unmarked bottle that are two-toned (light green and dark green) with E613 stamped on the light green side. Can you tell me what they are?

Thanks

Try this site to identify this,

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

... or take them to a local pharmacy to see if someone there can tell you what they are.