A member asked:

How long after long acting penicillin shot for syphilis is one contagious? does it depend on the stage ?

A doctor has provided 1 answer
Dr. Hunter Handsfield answered

Specializes in Infectious Disease

Regardless of stage, within 24 hours of receiving penicillin there is little if any risk of transmission. For a large margin of safety, most experts and official agencies (e.g. CDC, public health departments) recommend not resuming sex until a week has passed. Late syphilis (more than a year in duration) is not transmissible at all except by pregnant women to a baby she is carrying.

Answered 1/28/2023

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What happens if you can't have a penicillin shot for syphilis?

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