There are tons of natural antibiotics. None of my friends use the pharmaceutical ones.
There is garlic, honey, breastmilk, and a wide variety of herbal ones including tea tree oil and grapefruit seed extract. All of these also kill viruses and fungi, unlike the pharmaceutical ones.
You know what conventional medicine is good for? Stopping you from bleeding to death. Setting broken bones. Reattaching severed limbs. That sort of major mechanical trauma.