the shape is oval-color yellow-one side of the pill has pp on it the other side has st and it is a pill ## I found an exact match it's called Isoptin SR, this pill comes in four different colors green, yellow, white, and pink. Your pill is Isoptin SR 240mg. To read more about this drug click on the link below... Do you have any more questions or information to add? Please post back if you do.