In pharmacoepidemiology, the term effectiveness is used to describe the real-world effect of a drug while efficacy is used to describe the effect of the drug under ideal or tightly controlled clinical conditions.

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Effectiveness refers to how well a drug works in the real-world, outside of controlled clinical trials, while efficacy refers to how well it works under the ideal conditions of a controlled clinical environment.

In Pharmacoepidemiology, the Term Effectiveness Is Used to Describe the Real-World