Spastic bladder is bothersome. I have it if I take Ritalin. Basically even if you only have a little urine, your bladder will signal to empty. You can feel the need to urinate right after you actually did when there is nothing inside.

Before diagnosing it as just being out of the blue they should check the usual suspects, UTI (which they did), medication that can cause it, and neurological disorders.

In case they cannot find a cause, is the medication OK or does it have side effects?