I wouldn't say resisted.
As soon as the patent on terfenadine ran out, SELDANE® terfenadine manufacturer Hoechst Marion Roussel successfully petitioned the FDA to have terfenadine pulled from the market in favor of ALLEGRA® brand fexofenadine products such as Allegra-D (fexofenadine + pseudoephedrine), apparently because fexofenadine's interactions with foods and other drugs are much milder than those of terfenadine, as the digestive system actually turns terfenadine into fexofenadine. (Source: http://www.fda.gov/bbs/topics/ANSWERS/ANS00843.html)
But the timing makes one wonder: was it a safety precaution, or was it IP abuse?