Oxybutynin worked right away but it did not work as well. I only had a little more time between "urge" and "going," with Oxybutynin and I frequently couldn't hold it back. Myrbetriq allows more time to delay going, as there is no leakage, but it takes a while for it to take full effect. My costs for Myrbetriq through insurance is similar to yours, but at Costco the cost without insurance is $500 per month Oxybutynin is $12. Costco does not carry Gemtesa. Through my insurance company Myrbetriq and Gemtesa are similarly priced.