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API refers to the pharmaceutical raw materials used in the production of various types of preparations. It is the active ingredient in the preparations. It is prepared by chemical synthesis, plant extraction, or biotechnology for various powders, crystals, and extracts used as medicinal products. Substances that the patient cannot take directly. Complete definition of API in ICH Q7A: It is intended to be used for any substance or mixture of substances in the manufacture of drugs, and when used in pharmaceuticals, it becomes an active ingredient of drugs.

Synthetic Anti-infective Drugs

Synthetic anti-infective drugs refer to a class of drugs (or chemotherapeutic drugs) that inhibit or kill pathogenic microorganisms. Anti-infective drugs are basic medications, and are widely used in the treatment of various infections such as bacterial infections, fungal infections, chlamydia infections, viral infections, and other complications caused by other diseases. Synthetic anti-infective drugs mainly include: sulfonamides and antibacterial synergists, quinolones, anti-tuberculosis drugs, antifungal drugs, antiviral drugs, antiparasitic drugs, etc. Synthetic antibacterial drugs mainly include sulfonamides and their synergists, quinolones and nitroimidazoles. The "Echemi Synthetic Anti-infective Drugs" list mainly supplies APIs for such drugs.

Hormones and the Endocrine System

The endocrine system, referring to the systemic endocrine glands, is another important function regulating system other than the nervous system. Common hormones and drugs commonly used in the endocrine system, including hypothalamic pituitary hormones and their analogs, adrenocortical drugs, insulin and oral hypoglycemic drugs, thyroid hormones and antithyroid drugs, androgens and anabolic hormones, estrogen and progesterone etc. "Echemi Hormones and the Endocrine System" mainly supplies raw materials for such drugs.

Diagnostic Agents

Diagnostic agents refer to diagnostic reagents prepared using principles or methods such as immunology, microbiology, and molecular biology, and used in vitro for the diagnosis, detection, and epidemiological investigation of human diseases. Diagnostic agents can be divided into two categories: in vivo diagnostic reagents and in vitro diagnostic reagents. Except for the in vivo diagnostic reagents used for diagnosis, such as old tuberculin, brucellin, and Sickle toxin, most of them are in vitro diagnostic products. "Circulatory System Drugs" on Echemi includes organ function test agent, medical imaging drugs, and mainly supplies APIs for such drugs.
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