"i started taking the belviq about 2 weeks ago and i&#039;m already down 10 pounds. the bad part is i have the painful urination, frequent urge to go, back pain, increased headaches. i have gone to 2 specialist about my &quot;bladder issue&quot; and they have confirmed that this medication is the cause. it sucks because it&#039;s effective but i can&#039;t take the irritation."