it is always best to research the active ingredients in certain brand name medications that are usually found in europe or north america because the same label may not be available in brazil - national brand names may or may not contain the same components that could completely alter the drug. 

for instance, if in search of the popular  pain reliever brand 'advil' commonly found in the united states, it is best to search for the generic brand of the medication - in this case, one would search for 'ibuprofen', as it is the active ingredient in the brand - consulting a pharamacist is always recommended for safety reasons.