Oxybutynin
"I bought the OTC patch. I have problems with urge incontinence and thought this might help. Wore the patch for 24 hours, after a couple of hours of having it on I started noticing I was having cramps and pain, the urge got worse and I felt like I had to urinate constantly. I took the patch off and a few hours later the cramps and feeling of having to urinate constantly went away."