The best replacement for doxylamine succinate is diphenhydramine.

The best alternatives to doxylamine succinate are rated as following:
★★★★★  diphenhydramine
★★  chlorpheniramine maleate
★  diphenhydramine hcl
★  phenylephrine
  diphenhydramine hci
  diphenhydramine citrate
  diphenhydramine hydrochloride
  diphen

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Speaking about doxylamine succinate, one probably shouldn't forget about dxm.

Other search terms related to doxylamine succinate and their ratings are:
★★★★★ dxm
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Google Trends

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doxylamine succinate
diphenhydramine
chlorpheniramine maleate