The best replacement for gas x is beano.

The best alternatives to gas x are rated as following:
★★★★★  beano
★★★★  tums
★★  phazyme
★★  pepto bismol
★★  mylanta
★  pepto
★  alka seltzer
★  pepcid
★  activated charcoal
★  maalox
★  imodium
  beano better

Your alternative for gas x is not listed? Suggest!
Speaking about gas x, one probably shouldn't forget about maalox.

Other search terms related to gas x and their ratings are:

★★★★★ maalox
★★ pepto bismol
You have in mind a companion for gas x and it is not yet here? Propose!

Google Trends

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