Valsartan
"Took a 160 mg tablet 2 nights in a row. After the 1st dose, within minutes I had pain down my spine. Thought maybe I'd pulled some muscles. The pain stayed around 20 hrs. Took my 2nd dose, and pain started again, only worse, up & down spine and radiated around. Felt like I'd been in a car accident. If I hadn't looked up the drug's side effects, I would have gone to the ER thinking I'd had a heart attack. It's 18 hours later, and I still hurt. (Clearly not helping my blood pressure.)  My doc says he's never heard of anyone having this reaction, although a friend of mine, who is Ashkenazi Jewish female as I am, said it's common. Genetics maybe? B.P. not greatly lowered. Beta blocker works better but has side effects also."