How much was he drinking before diagnosis? How much now?
Marti (springer with Epi, which is when the most of the pancreas has necrotised) was thought to have this as a side effect. The vet was concerned about kidney washout. However as he treated her with lifesaving digestive enzymes, the ravenous thirst decreased., though her wee was always dilute but kidneys ok. It was awful to see her veer obsessively towards any old water anywhere, and having to restrain her drinking more than a couple of litres a day. She would flood the utility room at night. And yes, the two hour limit!
What is his poo like? Is he losing weight despite eating well?
Other members may groan , because Marti’ s condition was an autoimmune one, and she had all kinds of symptoms of failing organs , which have been in old posts, so I apologise . Has your research into diabetes insipidus, online, related it to other conditions?
She was never given drugs other than prednisone, none for the urine problem, so I can’t comment on them .