I just started using oxybutynin for the purpose of helping relieve head sweating. My urologist never replied to my letter. I asked if it would be safe and contact my GP with dosage. He never did so I went to my neurologist, he said it shouldn't be a problem. Well I took 10mg and it seems it kicked in at the 4 hour mark (dry mouth). It seem to help with the head sweating at about that time. I didn't have to be reclined in my chair. So my question is this safe, it seems like I retained more urine that day.