Hey as Flavoxate reduces muscle spasms of the bladder and urinary tract.

Uses
This medication is used to treat certain bladder/urinary tract symptoms. Flavoxate is a smooth-muscle relaxant.
It works by relaxing the muscles in the bladder. Flavoxate helps to reduce leaking of urine, feelings of needing to urinate right away, frequent trips to the bathroom, and bladder pain.
This medication does not treat the cause of your bladder symptoms (e.g., urinary tract/bladder/prostate infection or inflammation).

Dosage
Take this medication by mouth, usually 3-4 times a day or as directed by your doctor. Take with food if stomach upset occurs.
The dosage is based on your medical condition and response to therapy.

Side effects
Hot, dry skin and extreme thirst;
Confusion;
Pounding heartbeats, fluttering in your chest; or
Urinating less than usual or not at all.
Dry mouth;
Blurred vision;
Nausea, vomiting;
Drowsiness, nervousness;
Spinning sensation;
Headache; or
Fever.