I have just had my colonoscopy cancelled prior sedation as my blood pressure is around 195/127.This has come as a complete shock to me.Was told its much too high and was at risk of stroke or heart attack during the procedure. Several attempts made over a period of 4 hours but lowest reading was 174/123.highest was 204/130.I am 39 years old.I admit my lifestyle is poor and I drink far too much alcohol and eat lots of salt on my food. Doctor seems quite worried and says I need blood tests and ecg tomorrow. Colonoscopy will have to wait until my blood pressure comes down and I have been prescribed Lisinopril 2.5mg tablets 1 daily. so now I am not only worried about the rectal bleeding but also blood pressure. Could you tell me how effective these tablets are and should I be as worried as I am? I also suffer depression and take Cetalopram20mg daily.