Anybody else ever get an allergic reaction to generic Claritin (10mg loratadine daily)? I found one of the extreme side effects is muscle weakness and tension. Not sure if I should believe the internets and just deal with my allergies at this point. So, I'm just wondering if anybody else had dealt with this? - I've had on and off muscle weakness/tightness (especially in my hamstrings) for almost a year. Now, I'm at the point where I can't even run. I'm fatigued, dizzy, tight... Massage fixes it for about an hour and then it's back. It's not the type of tight that I can stretch out. It's more of a weak and rigid feeling and getting worse faster than ever. And, coincidentally, I've been remembering to take the Claritin more than ever. I think I've taken it for about a year too but I can't remember exactly when I started. I think I might be a slow-to-catch-on dumbass with a new yawning hobby.