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.
Syphilis passed to a baby from the mother (congenital syphilis) may be prevented if the woman is treated before the 16th to 18th weeks of her pregnancy. Treatment after 16 to 18 weeks will cure the infection and stop the damage to the baby. But it may not reverse damage already caused by the infection.