Phase III trials are described as which of the following?

Phase III trials are described as which of the following?

• A. Involves 1000 to 5000 volunteers to confirm effectiveness
• B. Involves 100 to 500 volunteers to evaluate outcomes
• C. Involves 100 to 500 volunteers to evaluate safety in healthy volunteers
• D. Involves 1000 to 5000 volunteers to confirm effectiveness and monitor adverse effects associated with long-term use

Answer: (D)

Phase III trials involve large numbers of participants to confirm a drug’s effectiveness and to monitor adverse effects, including long-term safety. These studies typically enroll about 1000 to 5000 volunteers and compare the new treatment to standard therapy or placebo across diverse patient groups and multiple centers. The aim is to gather robust data on how well the drug works in the real world and to identify rare or long-term safety issues before approval. Smaller studies focus on initial safety in healthy volunteers or early efficacy signals, which is why they don’t fit the Phase III description.

Phase III trials involve large numbers of participants to confirm a drug’s effectiveness and to monitor adverse effects, including long-term safety. These studies typically enroll about 1000 to 5000 volunteers and compare the new treatment to standard therapy or placebo across diverse patient groups and multiple centers. The aim is to gather robust data on how well the drug works in the real world and to identify rare or long-term safety issues before approval. Smaller studies focus on initial safety in healthy volunteers or early efficacy signals, which is why they don’t fit the Phase III description.