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.
People who are being treated for syphilis must abstain from sexual contact until the infection is completely gone. Sexual partners of people with syphilis should be tested and, if necessary, treated. What if Syphilis Is not Treated? If syphilis is left untreated, it can cause serious and permanent problems such as dementia, blindness, or death.