I took 3 pills of doxycycline for a day and a half for syphilis (early stage). I stopped and received an injection of penicillin G. It is stronger and the recommended antibiotic. I'm worried that the penicillin will not work because I started and stopped the doxycycline. Will the penicillin work?

Suggestions offered by doctors on Lybrate are of advisory nature i.e., for educational and informational purposes only. Content posted on, created for, or compiled by Lybrate is not intended or designed to replace your doctor's independent judgment about any symptom, condition, or the appropriateness or risks of a procedure or treatment for a given person.