Pharmaceutical tablet composition
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Key Ingredients in Pharmaceutical Tablet Composition
Pharmaceutical tablets are composed of several key ingredients, each serving a specific function to ensure the tablet's effectiveness, stability, and manufacturability. The main components typically include the active pharmaceutical ingredient (API), fillers or diluents, binders, disintegrants, lubricants, and sometimes coatings or special matrix systems.
Active Pharmaceutical Ingredient (API)
The API is the main therapeutic substance in the tablet. Examples include bilastine for allergies, brexpiprazole for central nervous system disorders, perampanel for epilepsy, prasugrel hydrochloride for antiplatelet therapy, and rabeprazole sodium for acid-related disorders Gujjar2017Mupkalker2018李阅东2016+2 MORE.
Fillers and Diluents
Fillers or diluents are used to add bulk to the tablet, making it a manageable size for handling and ingestion. Common fillers include lactose, sucrose, glucose, corn starch, mannitol, sorbitol, starch, and calcium hydrogen phosphate Gujjar2017李阅东2016. Some formulations use a combination of microcrystalline cellulose and sodium alginate for improved suspension properties .
Binders
Binders help hold the ingredients together, ensuring the tablet maintains its shape. Examples of binders are polyvinyl alcohol, methyl cellulose, ethyl cellulose, hydroxypropyl methyl cellulose, hydroxypropyl cellulose, sodium carboxymethyl cellulose, polyvinylpyrrolidone, and polyethylene glycol .
Disintegrants
Disintegrants facilitate the breakup of the tablet in the digestive tract, allowing the API to be released and absorbed. Common disintegrants include croscarmellose sodium, carboxymethyl cellulose, carboxymethyl starch, and low-substituted hydroxypropyl cellulose 李阅东2016Agyilirah1998高志亮2015. Superdisintegrants like cross-linked polyvinylpyrrolidone or sodium carboxymethylcellulose are also used for rapid tablet disintegration .
Lubricants
Lubricants prevent the tablet ingredients from sticking to manufacturing equipment and ensure smooth tablet formation. Typical lubricants are magnesium stearate, calcium stearate, talcum powder, polyethylene glycol, and colloidal silicon dioxide 李阅东2016高志亮2015.
Special Additives and Matrix Systems
Some tablets include additional components for specific purposes:
- Gas-generating agents and swelling agents: Used in formulations for controlled or sustained drug release, often in combination with gel-forming polymers to create a hydrated matrix for spatial and temporal drug delivery Spear2017Мехта2001.
- Coatings: Tablets may have enteric or immediate-release coatings to protect the API from stomach acid or to control the release profile アーメド，ハシム・エー2006Jaklic2007.
- Stabilizers: Ingredients like calcium hydroxide can be added to stabilize sensitive APIs, such as rabeprazole sodium, and prevent degradation .
Methods of Tablet Preparation
Tablets can be manufactured using various methods, including:
- Direct compression: Blending all ingredients and compressing them into tablets Gujjar2017Mupkalker2018.
- Dry granulation: Blending, granulating, and then compressing the granules into tablets Gujjar2017Mupkalker2018.
- Hot melt extrusion: Mixing the API with excipients at high temperature to form a uniform mixture, then compressing into tablets .
Combination and Layered Tablets
Some formulations combine multiple APIs in a single tablet, either as a monolithic matrix or in bilayer forms to ensure uniformity and controlled release of each component 이준희2016Мехта2001.
Conclusion
Pharmaceutical tablet compositions are carefully designed using a combination of APIs, fillers, binders, disintegrants, lubricants, and sometimes specialized additives or coatings. The choice and proportion of each component are tailored to the drug's therapeutic needs, stability, and desired release profile, ensuring efficacy, safety, and patient compliance Gujjar2017Mupkalker2018李阅东2016+7 MORE.
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