The “IB” itself is simply an abbreviation for ibuprofen. you may be confusing over the brand names i.e. Motrin IB. Motrin is simply the brand name, but the name of the active compound that provides anti-inflammatory activity is ibuprofen. read more
The only difference is the doses. Prescription ibuprofin pills are massive -- 800, even 1000mgs each. read more
Ibuprofen IB. Per the company "motrin® ib tablets are no longer available for purchase." Ibuprofen is still available for purchase. read more