A single dose of penicillin can cure syphilis, if the individual has had it for less than a year. A person who has had syphilis for longer than a year will need larger doses of penicillin. Other antibiotics may be used for people who are allergic to penicillin.
Penicillin and other antibiotics may cause rash and allergic reactions. They may also cause diarrhea, stomach upset, and nausea.
If syphilis is treated effectively and on time, the person will have no further problems.
Any new or worsening symptoms should be reported to the healthcare provider.