Hi, I started taking Letrazole in early November and initially felt fine. However, I've now started waking up early in the morning with joint pain in the knees, hips and shoulders. It does ease off the day, once I'm moving around. The repeat prescription from the gp is a different brand than what was given by the hospital. I'm not sure if this is the reason or if it's just the build-up in my body over time. Has anyone else had issues when taking Letrazole?