Abstract
Phase IV trials, also known as postmarketing safety and efficacy studies and postmarketing surveillance (PMS) studies, occur after a drug or medical device has received regulatory approval and is available in the market. These trials are designed to collect additional information regarding the product's safety, efficacy, and prolonged effects in a larger and more diverse patient population. The foremost goal of phase IV trials is to detect any rare or long-term adverse effects that may not have been identified during the prior phases of clinical development. During phase IV trials, pharmaceutical companies, academic institutions, or other research organizations conduct studies to evaluate various aspects of the product, including its real-world effectiveness, optimal use, and any potential safety concerns. The regulatory agencies play a role in overseeing these trials to ensure that they are conducted ethically and in compliance with good clinical practice (GCP) guidelines.
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