The process of developing a new drug was long and expensive; pharmaceutical companies increasingly avoided it in favor of marketing or repurposing drugs that were already in circulation. When they did choose to embark on such a costly journey, it culminated with the human testing phase, the final stretch before a new drug could receive FDA approval and be sold to consumers. Testing began with Phase I, which was the first time a drug was tried out on a small sample of humans. If the drug proved safe and effective on that smaller first group of volunteers, it moved on to Phase II, where it was
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