Final answer:
The fifth and final stage in producing a new drug is the approval process, which involves testing the drug on human subjects to ensure safety and effectiveness. This process is overseen by the FDA and requires collaboration among physicians, scientists, and chemists.
Step-by-step explanation:
The fifth and final stage in producing a new drug is the approval process.
Once a drug has been developed and tested for safety and effectiveness, it must go through a series of experiments using human subjects to ensure it is not harmful and effectively treats the intended condition. This process is typically carried out by the Food and Drug Administration (FDA) in the United States and can take several years to complete.
During the approval process, physicians, scientists, and chemists work together to complete all necessary testing and gain approval for the drug's use in the market.