IRCT2014022616750N1 IRCT 2014-04-21 Deputy of research and technology, Shahrekord university of medical sciences The comparison of the effect of N-acetylcysteine and angiotensin- converting enzyme inhibitors with angiotensin-converting enzyme inhibitors alone to control blood pressure in hypertensive patients The effect of N - acetylcysteine and angiotensin converting enzyme inhibitors The comparison of the effect of N - acetylcysteine and angiotensin- converting enzyme inhibitors with angiotensin-converting enzyme inhibitors alone to control blood pressure in hypertensive patients referred to Hajar medical hospital 2014-03-02 anticipated 126 Complete https://irct.ir/trial/15575 interventional Randomization: Randomized, Blinding: Not blinded, Placebo: Not used, Assignment: Crossover, Purpose: Treatment. 3 Blood pressure. The first group is to be prescribed NAC with the doses of the 600mg dissolved in 30cc water/12hrs along with ACEI for two months. The second group is to be treated with ACEI alone. During this two months , blood pressure of both groups is to be measured every 5-7 day. After that, none of each group will received NAC and only is to be taken ACEI.In this period also, the blood pressure is to be measured every 5-7 day. After two weeks, their program is to be switched..