high blood pressure
"I developed crippling stomach/abdominal pain and my doctor dismissed any connection to my medication. I consequently underwent several scans and tests which as well as being very costly to the NHS also took up valuable time which could have been spent on other patients. All results came back normal. 
It was purely accidental that I forgot to collect my prescription on a Friday and went on to enjoy a pain free weekend. I was put onto beta-blockers for my high blood pressure instead on which I have been fine, but interestingly the doctor still insisted that the Losartan would not have caused my symptoms !"