<s>[INST] my age is 40 and i am 5ft 10 inches tall male i am having medicine for blood pressure since one years i.e.concor 2.5 mg i am not having errection since  one month .my blood pressure is also varying sometimes it is on low side for eg.120/70 sometime it is on higher side for e.g.140/90.when my b.p.is low i also have pulpation.Please advice i am very much worried [/INST] Concor is a beta blocker, which is a very good medication for controlling blood pressure. One of the common side effects from beta blockers is erectile dysfunction; I would discuss this with your physician to see if you might be able to switch to another blood pressure control medication. Additionally, if you are having palpitations when your blood pressure is lower, that could mean you are not well hydrated. Please be sure to drink at least 2 liters of water per day, more if you are active/sweating. </s>