The best replacement for milk of magnesia is miralax.

The best alternatives to milk of magnesia are rated as following:
★★★★★  miralax
★★★★  magnesium citrate
★★★  mylanta
★★  maalox
★★  pepto bismol
★★  dulcolax
★  exlax
★  colace
★  metamucil
★  lactulose
★  stool softener
★  epsom salt
★  magnesium
★  ex lax
★  mineral oil
★  pepto
★  tums
★  senna
  citrate of magnesia
  epsom salts

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Speaking about milk of magnesia, one probably shouldn't forget about cascara.

Other search terms related to milk of magnesia and their ratings are:

★★★★★ cascara
★★★ prune juice
★★ miralax
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milk of magnesia
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