Recently it was publicized that certain lots of Children's Tylenol contain a non-kosher form of glycerin, and therefore should not be used in non-urgent situations. Does anyone have information about the status of liquid Advil and Motrin?
Here's the warning you are talking about: Kashrus Alerts
It seems that it only affects the Tylenol version that's produced in Canada. However, it's best that you contact the Star-K for further information: Contact STAR-K
If you do get further information, please come back here and post it so that others can see it in the future.