Early syphilis (primary secondary、early latent） procaine penicillin 0.8 million U daily by intramuscular injection for 10-15 days benzathine penicillin 2.4 million U by intramuscular injection per week for 2 to 3 weeks Early syphilis (primary、 secondary、early latent ) • procaine penicillin 0.8 million U daily by intramuscular injection for 10-15 days • benzathine penicillin 2.4 million U by intramuscular injection per week for 2 to 3 weeks