The best replacement for bisacodyl is senna.

The best alternatives to bisacodyl are rated as following:
★★★★★  senna
★★★★★  sennosides
★★★★  dulcolax
★★★  docusate
★★★  glycerin
★★  senokot
★  colace
★  docusate sodium
★  glycerin suppositories
★  glycerin suppository
★  polyethylene glycol
  sodium picosulfate
  sodium picosulphate

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Speaking about bisacodyl, one probably shouldn't forget about golytely.

Other search terms related to bisacodyl and their ratings are:
★★★★★ golytely
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Google Trends

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bisacodyl
senna
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