1. Cephalexin
  2. Penicillin
  3. Erythromycin
  4. Ciprofloxacin
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Option 2 : Penicillin

  • Penicillin is the antibiotic most commonly used to treat syphilis. Penicillin is usually given as a shot (injection).
  • If you are allergic to penicillin, your doctor may prescribe another antibiotic in early stages of syphilis, such as doxycycline, tetracycline, ceftriaxone, or azithromycin.
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