Pharmaceutical Product Development 8th sem Unit 2 Complete Notes
Pharmaceutical products development involves the careful selection and formulation of active pharmaceutical ingredients (APIs) with other substances known as excipients. Excipients are inert substances that are added to pharmaceutical formulations to improve stability, enhance drug delivery, provide physical form and texture, and aid in the manufacturing process.
Excipients play a crucial role in pharmaceutical product development as they interact with APIs to ensure the safety, efficacy, and bioavailability of the final drug product. They can be classified into different categories based on their function, such as fillers, binders, disintegrants, lubricants, coating agents, sweeteners, and flavoring agents.
Fillers or diluents are excipients used to add bulk to pharmaceutical dosage forms like tablets and capsules. Examples of commonly used fillers include microcrystalline cellulose, lactose monohydrate, and dicalcium phosphate. These fillers ensure the proper volume of the dosage form and aid in the uniform distribution of the API.
Binders are excipients that are added to ensure the cohesion and integrity of the tablet during manufacturing and subsequent handling. They provide adhesion between particles, improving the tablet’s mechanical strength. Commonly used binders include hydroxypropyl cellulose, polyvinylpyrrolidone, and methylcellulose.
Disintegrants, on the other hand, are excipients that promote the disintegration or breakup of the tablet or capsule in the gastrointestinal tract, facilitating drug release. Examples of disintegrants include crospovidone, croscarmellose sodium, and sodium starch glycolate.
Lubricants are excipients added to formulations to reduce friction during tablet compression or capsule filling. This prevents the tablets from sticking to the punch and die surfaces. Some commonly used lubricants are magnesium stearate, stearic acid, and polyethylene glycol.
Coating agents are excipients used for coating tablets or capsules, providing protection, stability, and controlled release of the drug. These agents can also modify the drug release profile or improve the appearance of the dosage form. Common coating agents include hydroxypropyl methylcellulose, ethyl cellulose, and shellac.
Sweeteners and flavoring agents are excipients used to enhance the taste and palatability of oral drug formulations like syrups and chewable tablets. They help mask the bitter taste of some APIs and make the formulation more appealing to patients. Examples of sweeteners are sucrose, sorbitol, and aspartame, while flavoring agents can include natural and artificial flavors.
Apart from the aforementioned categories, excipients like antioxidants, preservatives, solubilizing agents, and pH modifiers may also be used, depending on the specific formulation requirements. These excipients help improve the stability, shelf life, solubility, and pH of the final drug product.
Throughout the pharmaceutical product development process, excipients undergo rigorous testing to ensure their compatibility with the API and their