I Have MS With Urinary Problems. I Would Like More

I have MS with urinary problems. I would like more information about Pepsid. I once used the purple pill for a urinary problem I had. After having Botox injections, the pill made my bladder more calm and helped my "angry" bladder. I have not used or even had the pill for several years and am wondering if I can still get a prescription for it. Thank you. Marilyn Shepherd