Long story short, yes, you could – moldy bread has been used to combat disease for millennia.
The distinction is essentially one of refinement/purification and dosage; the antibiotic is «cleaned» from other substances (such as rotten bread) and bits that might not be quite as good for you, and packed into an easier-to-swallow capsule that is less unappealing than old, moldy bread. 🙂
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