The best replacement for tetany is tetanus.

The best alternatives to tetany are rated as following:
★★★★★  tetanus
★★★★  summation
★★★★  cramp
★★  treppe
  milk fever

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Speaking about tetany, one probably shouldn't forget about hypoparathyroidism.

Other search terms related to tetany and their ratings are:
★★★★★ hypoparathyroidism
★★★★ hypocalcemia
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tetany
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