Active pharmaceutical intermediates are the components that provide therapeutic effects in medications. The quality of these intermediates directly impacts the drug's safety and effectiveness. High-quality APIs are essential for ensuring that the medication performs as intended and does not cause adverse effects. The production of APIs involves rigorous testing and quality control measures to meet stringent regulatory standards.

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Moreover, the rise of biopharmaceuticals has led to a growing interest in biotechnological methods of API production. Using living organisms or cells to produce complex molecules, these methods often yield APIs that are difficult to synthesize chemically, opening new avenues for drug discovery.

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An API can be defined as a compound that is biologically active and is used in the formulation of drugs. It is the core component that provides the desired therapeutic effect. For instance, in a pain-relieving medication, the API might be acetaminophen. The other components in the formulation, known as excipients, are inactive substances that serve as carriers for the API or enhance the stability, solubility, and delivery of the drug.

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