The best replacement for hyperreflexia is dysreflexia.

The best alternatives to hyperreflexia are rated as following:
★★★★★  dysreflexia
★★★  clonus

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Speaking about hyperreflexia, one probably shouldn't forget about clonus.

Other search terms related to hyperreflexia and their ratings are:
★★★★★ clonus
★ hypotonia
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hyperreflexia
dysreflexia
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