There is no kosher ibuprofen,
The Star-K lists regular Motrin on their approved list and also lists Walgreens Infants’ Ibuprofen 0.5oz with NDC#0363-1252-24. Walgreens website indicates that NDC#0363-1252-24 is in fact a 1oz bottle and the half ounce bottle is actually NDC#0363-1252-23. The package you want says “Dye Free” they also have with dyes but it is a different NDC#.
Please allow these links:
http://www.star-k.com/cons-appr-medecine.htm
http://www.walgreens.com/search/results.jsp?Ntt=461190+or+461193