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.
What Are the Symptoms of Syphilis? There are three stages of syphilis. Call your doctor if you experience any of the following symptoms: In the first (primary) stage, which usually starts about three weeks after exposure, a painless sore called a chancre appears on the genitals, rectum, anus, or mouth. Lymph glands near the chancre may be swollen as well.