Is It Safe To Take Oxytrol Over Enablex To Treat Urge Incontinence?

I have been taking Enablex which has successfully controlled urge incontinence. My prescription insurance has changed, and the price of this medication has increased substantially. I'm researching alternatives and found that there is no generic alternative for Enablex. I also found that Oxytrol is now available as an over the counter med, which would simplify access to it, but I'm wondering if you have information about it's effectiveness or if there is any other medication that works in a similar manner to Enablex since I know that is effective. Thanks,I didn't realize there was a charge to get an answer, and I'm not interested in paying, so please disregard.