The best replacement for gravol is dramamine.

The best alternatives to gravol are rated as following:
★★★★★  dramamine
★★  bonine
★★  zofran
★★  pepto bismol
★★  metoclopramide
★★  meclizine
★★  ondansetron
★  nytol
★  stemetil
★  pepto
★  motilium
  diclectin
  dimenhydrinate

Your alternative for gravol is not listed? Suggest!
Speaking about gravol, one probably shouldn't forget about diclectin.

Other search terms related to gravol and their ratings are:
★★★★★ diclectin
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gravol
dramamine
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