The best replacement for tetracycline is doxycycline.

The best alternatives to tetracycline are rated as following:
★★★★★  doxycycline
★★★★  minocycline
★★★  erythromycin
★★★  amoxicillin
★★★  penicillin
★★  accutane
★  ampicillin
★  tetracycline hydrochloride
★  azithromycin
★  macrolide
★  aminoglycosides
★  cephalexin
  oxytetracycline
  isotretinoin
  chloramphenicol
  triple sulfa
  terramycin
  tetralysal
  clindamycin
  minocin

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

Other search terms related to tetracycline and their ratings are:
★★★★★ penicillin
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Google Trends

Scale is based on the average worldwide traffic of tetracycline in all years. Click on graph for more.
tetracycline
doxycycline
minocycline