Stage of infection | Regimen |
---|---|
Primary | Benzathine penicillin G, 2.4 million units intramuscularly × 1 |
Secondary | |
Early latent (<1 year) | |
Late latent (>1 year) | Benzathine penicillin G, 2.4 million units intramuscularly weekly × 3 |
Unknown duration | |
Neurosyphilis | Aqueous penicillin G, 2–4 million units intramuscularly every 4 hours × 10–14 days |
or | |
Procaine penicillin G 2.4 million units intramuscularly and probenecid 500 mg by mouth four times daily × 10–14 days |