since i don't know how you were diagnosed (lab culture rapid strep test or just "a look and see" by your medical provider) penicillin remains the treatment of choice for treating true lab-diagnosed group a beta hemolytic strep (also known as strep throat). a z-pack is really not the appropriate dose for treating strep and i don't know the dose you received of the penicillin. i can say that failure of antibiotics often means that you (a) never had strep but a viral sore throat -- in which case no antibiotic would help (b) you were not treated appropriately either by dosage etc. for a lab-diagnosed case (c) you are a strep-carrier (this can be difficult to cure by oral antibiotics) or (d) you have mono/mononucleosis that clinically-mimicked strep throat -- in this case you need to have a lab test called an ebv panel to see if you have mono. either way you need to contact your medical provider -- the only one that can order any additional lab tests and/or treat you further.
i was diagnosed with strep throat and given penicillin for 7 days. it came back and now on zpac and it's not working. it came back a few days after antibiotic was done. i don't think zpac is the right antibiotic. what is the most effective antibiotic for a strep throat? .