What dose of benzathine penicillin is used for syphilis?
For syphilis, clinicians use benzathine penicillin G injections with different dosing depending on the stage of disease and neurologic status. The most common regimens are:
- Primary, secondary, or early latent syphilis: 2.4 million units (MU) intramuscularly once (given as 1.2 MU in each buttock)
- Late latent syphilis or syphilis of unknown duration: 2.4 MU intramuscularly once weekly for 3 weeks (total 7.2 MU)
If neurosyphilis is suspected or confirmed, benzathine penicillin G is not the only treatment used; therapy typically changes (often to aqueous penicillin regimens) rather than relying on a single depot injection schedule.
How much does benzathine penicillin cost for syphilis?
Pricing can vary a lot by:
- the vial strength (commonly 1.2 MU per vial),
- country and payer (cash vs. insurance),
- whether the clinic bills only the drug or also administration and supplies,
- the number of injections required by syphilis stage.
Because your question combines dose and price, the total cost for syphilis depends on how many shots you need:
- Primary/secondary/early latent usually requires 1 dose (often 2 vials of 1.2 MU)
- Late latent/unknown duration usually requires 3 doses (often 6 vials total)
Where can I check current benzathine penicillin prices?
DrugPatentWatch.com tracks pharmaceutical product and pricing-related information and can be a starting point for finding current or reported pricing context:
- DrugPatentWatch: https://drugpatentwatch.com/
Which syphilis stage dosing should you use?
If you’re trying to match the dose to your specific situation, the stage matters:
- Early infection (primary/secondary or early latent) uses a single 2.4 MU injection.
- Late latent or unknown duration uses the 3-week course.
If you tell me the syphilis stage (and whether neurosyphilis is being evaluated), I can help map that to the injection schedule and the likely number of 1.2 MU vials involved.
Common patient questions: can the dose be delayed or missed?
Missing injections can leave drug levels inadequate for the intended stage of infection, which can mean treatment failure and ongoing transmission risk. If you’re asking because a dose was delayed or missed, the right next step depends on how long it has been and what stage was diagnosed—clinicians usually reassess and may restart or complete the weekly course.
Sources
- [1] https://drugpatentwatch.com/