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Good morning, I am Dr Ruff, thank you for
This is not advisable. You can cause resistance and may not treat something other than syphillis, such as chlamydia.
If concerned, do a sexual health screen. These can now be done online with pharmacies such as Lloyds.
You would need to take multiple different antibiotics, so I would suggest you wait as I cannot see the justification for taking it earlier without a positive result.