The best replacement for acetylcysteine is guaifenesin.

The best alternatives to acetylcysteine are rated as following:
★★★★★  guaifenesin
★★★★  carbocisteine
★★★★  n-acetylcysteine
★★★  bromhexine
★★  nac
★★  cysteine
★  erdosteine
★  l-cysteine
★  glutathione
★  n-acetyl-l-cysteine
  ambroxol
  mucomyst
  acetylcysteine

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acetylcysteine
guaifenesin
carbocisteine