IRCT20200112046101N2 IRCT 2022-04-18 Shahroud University of Medical Sciences Assess the effect of Cretaegus on hypertension Assess the effect of Cretaegus herbal medicine on control of hypertension patients 2022-06-22 anticipated 110 Complete https://irct.ir/trial/62607 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Other design features: We do not use any placebo in this study, Randomization description: We used block randomization ( with 4 letters). Because , patients will be entered in the study gradually and having equal sample size in both groups. Therefor, 24 block that included of 4 letters will be made. The desired sequence have been made by this website (https://www.sealedenvelope.com/simple-randomiser/v1/lists ), Blinding description: In this study, the nurse who measure the blood pressure and statistical counsellor are blinded. In this regard, we use 28 closed pockets which type of group determined inside of them. we number on each pockets. After, basic information of the patients written, a pocket will be opened and their type of group will be determined. N/A Essential hypertension. Intervention 1: Intervention group: The group used Cretaegus drop with hypertension drugs. They have to use the drop three times a day and each time include of 20 drops till 4 months . The drop is produced by Iran Darouk company. Intervention 2: Control group: This group just use their common hypertension drugs to control their blood pressure for four months. Undecided - It is not yet known if there will be a plan to make this available Justification or reason for indecision in sharing IPD is there is no more information.