Hello There. I can understand your condition. if he having such low blood pressure i do not understand the point of taking the mentioned anti-hypertensives. kindly look into that aspect. the antihypertensives which he is taking are -metoprolol, telmisartan, chlorthalidone. also isosorbide mononitrate also has blood pressure lowing property. consult a cardiologist for further assistance. if his blood pressure is normal without the medications, then he just needs to make some dietary changes like salt restriction and avoiding oily and spicy foods. kindly consult a cardiologist in person for further evaluation and management of his case. best regards, Dr. Anil kumar jain.