Hi Thanks for your query. I appreciate your concern for the comparative efficacy of Myrbetriq over Oxybutynin. From the safety and efficacy point of view, Myrbetriq is a better alternative to Oxybutyin. This drug (Myrbetriq) has a different mechanism of action by which it controls the symptoms (urgency and frequency of urination) of over active and is well tolerated overall. The well known side effects of Oxybutyin like increase heart beat, dry mouth, constipation, and blurred vision are less likely to occur with Myrbetriq. Hope this answers your query., Rate this answer if you are convinced.