HPLC determination of the contents Chlorogenic acid and Hydrochlorothiazide in Zhenjujiangyapian Rapid determination of 34 chemicals illegally added into Chinese patent medicines and health foods with blood pressure lowering function by UPLC-MS/MS Determination of hydrochlorothiazide, prazosin hydrochloride, promethazine hydrochloride, reserpine, and nifedipine illegally added into Qingnao Jiangya Tablets by HPLC method