5-FU injection and topical even in small doses cause both acute central nervous system (CNS) damage and progressively worsening delayed degeneration of the CNS in mice. This latter effect is caused by 5-FU-induced damage to the oligodendrocytes that produce the insulating myelin sheaths.
Home > Sexually transmitted infections > Syphilis > After treatment for syphilis. It is strongly advised that you do not have any sexual intercourse; including vaginal; anal or oral sex until you and your partner(s) have both finished the treatment and any follow-up treatment.
Unlike the diagnosis, treatment is fairly straightforward. During the primary, secondary, and early latent phases of syphilis, a single injection of penicillin cures the disease. People who are allergic to penicillin (and not pregnant) may be given oral antibiotics (such as doxycycline, tetracycline, or erythromycin) for 2 weeks.