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.
Abstain or be monogamous. The only certain way to avoid syphilis is to forgo having sex. The next-best option is to have mutually monogamous sex with one partner who is uninfected. Use a latex condom. Condoms can reduce your risk of contracting syphilis, but only if the condom covers the syphilis sores.