Inorganic salts: Inorganic salts are compounds that are composed of anions and cations, and they are used in pharmaceutical manufacturing as buffering agents, pH adjusters, and to maintain osmotic balance. Some common inorganic salts used in pharmaceutical manufacturing include sodium chloride, calcium chloride, and potassium phosphate.

Pharmaceutical raw materials: Pharmaceutical raw materials are the basic ingredients used in the production of drugs. They can be natural or synthetic, and they include substances such as vitamins, amino acids, and sugars, as well as various chemicals such as acids, bases, and solvents. The quality and purity of these raw materials are critical to the safety and efficacy of the final drug product.

Excipients: Excipients are substances that are added to a drug formulation to aid in its manufacture, stability, and delivery. They can help to improve the solubility, bioavailability, and shelf life of the drug, and can also be used to mask unpleasant tastes or odors. Examples of common excipients include binders, lubricants, and disintegrants.

APIs: APIs are the active ingredients in a drug that provide the desired therapeutic effect. They are often derived from natural sources, such as plants or animals, or they can be synthesized in a laboratory. APIs must be carefully manufactured to ensure their purity and potency, as even slight variations in their composition can affect the safety and efficacy of the final drug product.

Overall, these categories of pharmaceutical bulk drugs are essential to the production of safe and effective drugs. Manufacturers must carefully select and source these ingredients to ensure the quality and purity of their products, and to ensure that they meet strict regulatory standards.