Treatment recommended for secondary syphilis is
Benzathine penicillin G 2.4 mIU i.m weekly, 3 doses
Benzathine penicillin G 2.4 mIU i.m single dose
Benzathine penicillin G 2.4 mIU i.m twice weekly, 4 doses
Benzathine penicillin G 2.4 mIU i.m twice daily for 2 weeks.