The best replacement for azo is cystex.

The best alternatives to azo are rated as following:
★★★★★  cystex
★★★★★  uristat
★★★★★  pyridium
★★★★  uricalm
★★★  monistat
★★★  cystex plus
★★  rephresh
★  uribel
★  ellura
★  urelle
★  phthalocyanine
  super azo
  niacin
  uristat better

Your alternative for azo is not listed? Suggest!
Speaking about azo, one probably shouldn't forget about pyridium.

Other search terms related to azo and their ratings are:
★★★★★ pyridium
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