Syphilis is a sexually transmitted disease caused by infection with the syphilis spirochete. The cost of benzathine penicillin is about six dollars per injection, and the treatment of syphilis requires two injections each time, once a week for two to three weeks, which means the cost is about ten dollars each time. You should avoid drinking alcohol during the use of benzathine penicillin and avoid sexual contact to avoid cross-infection After treatment, you need to periodically recheck the titer of syphilis spirochete antibody and non-syphilis spirochete antibody. When there is a fourfold increase in the titer, syphilis spirochete activity is considered and treatment needs to be given again.