The best replacement for akathisia is tardive dyskinesia.

The best alternatives to akathisia are rated as following:
★★★★★  tardive dyskinesia
★★★★  akinesia
★★★★  restless leg syndrome
★★★★  agitation
★★★  akathisia
★  restless legs
★  psychomotor agitation
  restless leg

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Speaking about akathisia, one probably shouldn't forget about ssri.

Other search terms related to akathisia and their ratings are:
★★★★★ ssri
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akathisia
tardive dyskinesia
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