Both my older male and female dogs became incontinent as they got old. I didn't know about belly bands, and female diapers didn't work well at all on male dogs! Had a bit easier time of it with the female dog, but it was still a trying time. Both were incontinent for over a year before their ultimate demise, and both would pee in the house and in their crates at night. The only thing I could do was take them out as late at night as I could stand before putting them in the crate for the evening, and get up as early as possible to let them out. Still, there were accidents many times. Our female was on the same medication as your dog, and helped a bit, but not completely. It just seems to be a part of getting older for many dogs. In both cases, my dogs were quite old and had kidney issues that caused them to drink more water than the usual and be less able to concentrate their urine, which led to more frequent and copious urination.
Good luck -- it's a challenge for sure.
Emily
2011 Jamis Dakar XC "Toto" - Selle Italia Ldy Gel Flow
2007 Trek Pilot 5.0 WSD "Gloria" - Selle Italia Diva Gel Flow
2004 Bike Friday Petite Pocket Crusoe - Selle Italia Diva Gel Flow