The interference of indomethacin and of imidazole salicylate on blood pressure control of essential hypertensive patients treated with atenolol. Preliminary report.

To evaluate whether imidazole salicylate, a recently developed NSAID, can interfere with the antihypertensive effect of atenolol and to compare its action with that of indomethacin, 9 essential hypertensives, while on prolonged (more than 1 month) treatment with atenolol (100 mg qd) received, according to a double-blind cross-over study, imidazole salicylate (750 mg t.i.d.) or indomethacin (50 mg b.i.d. plus a placebo tablet) for 1 week, reverting the treatment after a 2-week wash-out period. While indomethacin addition significantly increased blood pressure, when compared to atenolol alone, imidazole salicylate did not change it. These data show that imidazole salicylate, unlike indomethacin, does not reduce the antihypertensive effect of atenolol.