Radiation nurses gave me a penile clamp because, as you say, drinking enough and still being able to hold it through radiation is really difficult. I would put it on while I was drinking and about an hour before treatment appointment, since they recommended not using it more than two hours. There were still two times (out of 44) that my bladder wasn’t full enough for treatment and I went back to the waiting room until the urge was strong.

Thanks Chippydoo,

Very good information here, I will definitely ask about both of those right off the bat.