the terrible muscle spasms and pain I am having in my right leg. Both legs started having spasms in the back of my calves and now after being on it about 2 months, the pain in my rt leg and lower back, and thigh is so much worse. I do have some lumbar problems..yet never had it act up this badly? Strange question I know...yet I wonder about the potasssium? Have to take it with my BP med.