RCTs typically go through several phases, especially in the context of drug trials:
Phase I: Tests the safety, tolerability, pharmacokinetics, and pharmacodynamics of a treatment in a small group of healthy volunteers or patients. Phase II: Explores the efficacy and side effects of the treatment in a larger group of patients. Phase III: Confirms the efficacy and monitors adverse reactions in a larger population, often leading to regulatory approval. Phase IV: Post-marketing studies to gather additional information on the treatment's risks, benefits, and optimal use.
