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I'm a physician - am MD. As long as I don't get burnt at the stake for witchcraft, I could go back as far as I wanted. People's biology hasn't changed much since Neolithic times.
Be a shame you can't make medicines though
Just washing one's hands before touching the patient would make a massive difference, alcohol is pretty abundant, willow bark tea for the pain (and contact your local herbalist for other remedies), you could infect people with cowpox to vaccinate them against smallpox, you might even be able to grow some penicillin if you manage to make some rudimentary Petri dishes out of broth or beer wort and happen to have the right spores floating around...
Penicillin isn't just growing some mold, it was selected for out of literally tens of thousands of strains of mold that were sent in from around the globe to find one that wouldn't kill the patient. You would, at a minimum, need: microscope optics, glassblowing equipment to perform extractions and purifications, a source of solvents (ether will only go so far), assaying equipment (even old school stuff needs indicators), and enough industrial progress to make and machine steel to be able to scale any of it up.
Just finding the correct strain of mold to begin to produce any form of antibiotics would need a pretty insane amount of hardware to make what we would consider a rudimentary lab in modern times, let alone isolating it in a way that's safe for human consumption.
Before the twentieth century killing the patient wasn't a big deal, it was kind of expected. Robert Liston, the best (or at least fastest, which for surviving patients was what mattered) surgeon of the nineteenth century, once had a 300% death rate in one of his surgeries (he killed the patient, an assistant, and a spectator) and all the reaction he got was “well, it was a good attempt, try to do better next time”.
Just keep trying until you find a strain that kills less patients than the previous one. They would probably have died from gangrene anyway, so it's not like you're killing them, really, just changing the cause of death. 🤷♂️
No medicine, no hospitals, no diagnostic or treatment tools? No trauma care. How much can you really do?
As a non-medical person, I can’t do much more than sterilize a wound and apply a bandage. All respect to you but that far back would you be able to do any more?
Being able to set a bone, sterilize a wound, and stitch it closed would make a huge difference for a lot of people. High proof alcohol and cauterization, and fine enough needles are the hardest parts on that list.