What is the ruling on delaying prayer due to frequent urination resulting from taking medication for kidney failure?

Congregational prayer in the mosque is obligatory for free, resident men. If you are able to go to the mosque and pray in congregation, then it is incumbent upon you to do so. If it is difficult for you to hold your urine from the time you leave home until the prayer is finished, then perform your ablution in the mosque immediately before the prayer is established. There is no justification for delaying the prayer beyond its prescribed time and missing the congregational prayer; this will only benefit you by leaving ablution for the second prayer.