The best replacement for insipidus is siadh.

The best alternatives to insipidus are rated as following:
★★★★★  siadh
★★★  diabetes mellitus
★★★  mellitus
★★  cerebral salt wasting
★  type 2 diabetes
★  diabetes
★  nephrogenic diabetes insipidus
★  type 1 diabetes
★  polydipsia
  psychogenic
  mellitus diabetes
  syndrome of inappropriate antidiuretic hormone

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Speaking about insipidus, one probably shouldn't forget about hypernatremia.

Other search terms related to insipidus and their ratings are:
★★★★★ hypernatremia
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Google Trends

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insipidus
siadh
diabetes mellitus