The best replacement for antibiotic is antibacterial.

The best alternatives to antibiotic are rated as following:
★★★★★  antibacterial
★★★★  antimicrobial
★★★  antiseptic
★★  antiviral
★★  probiotic
★★  vaccine
★★  antibody
★  antifungal
★  anti infective
★  penicillin
★  disinfectant
★  steroid
  antimicrobic
  antibacterial agent
  neosporin
  triple antibiotic
  antimicrobial agent
  anti-infective
  synthetic drug

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

Other search terms related to antibiotic and their ratings are:
★★★★★ steroid
★★★★ probiotic
★ metallic taste
acidophilus
You have in mind a companion for antibiotic and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of antibiotic in all years. Click on graph for more.
antibiotic
antibacterial
antimicrobial