Pharmaceutical dosage form · BEGINNER LESSON
Pellet
In medicine and pharmaceutics, a pellet is a small spherical or semi-spherical solid part made of drug plus excipients, usually about 0.5 to 2.5 mm wide. What is measured about pellets is their size, coating, release rate, and how completely they disintegrate and release drug.
What it is
A pellet is a small solid unit used in medicine, usually made from an active pharmaceutical ingredient (API, the drug that produces the intended effect) plus excipients (inactive materials that help shape or release the drug). The sources describe pellets as globular or spherical multi-particulates, typically about 0.5 to 2.5 mm in diameter. They are used alone or packed into tablets or capsules.
[2] Investigation for the quality factors on the tablets containing ... [3] Fast disintegrating pellets: Formulation and evaluation - PMC
What is measured
For pellets, scientists and manufacturers measure size, shape, coating, disintegration time, release rate, and sometimes bioavailability, which means how much of the drug reaches the body in usable form. In coated pellets-containing tablets, the pellet cores, coating, and tabletting process all influence how the drug is released.
[2] Investigation for the quality factors on the tablets containing ... [3] Fast disintegrating pellets: Formulation and evaluation - PMC
How they work
Pellets can be designed for sustained release, controlled release, taste masking, or to combine different drugs and release profiles in one dosage form. A tablet containing pellets can break apart into the pellets first, and then the drug is released from each pellet according to its coating and core properties. This makes it possible to adjust release by changing the mix of pellets with different behaviors.
[2] Investigation for the quality factors on the tablets containing ...
How they are made and why that matters
One common method is extrusion-spheronization, a process that forms rounded pellets from a wet mass. The sources note that microcrystalline cellulose (MCC, a plant-derived processing aid) is commonly used, but MCC-based pellets may release drug too slowly because the structure can shrink during drying and limit water entry. Adding materials such as mannitol, polyethylene glycol (PEG), croscarmellose sodium (CCS), or polyplasdone XL can improve disintegration by making the matrix more porous and easier for water to enter.
[3] Fast disintegrating pellets: Formulation and evaluation - PMC
Limits and evidence
Not all pellets have the same evidence base. The hormonal pellet literature in the sources shows that some compounded pellets have limited or low-quality evidence, dosage-control concerns, and possible safety issues such as hormone peaks, prolonged elevations, and unwanted effects. For example, some reviewed hormonal pellets had only weak or outdated studies, and the sources say strong conclusions about safety and effectiveness are often not possible.
[1] Compounded hormonal pellets: a critical review of current ...
SEE THE IDEA
How a pellet dosage form works
The starting materials inside the pellet
Small spherical or semi-spherical units are made
Controls taste, stability, and release rate
Water enters and drug is released from the pellet
The released drug can be absorbed and act in the body
Each step shapes the next: composition affects formation, which affects coating or matrix behavior, which affects release and absorption.
A pellet is a designed solid unit; its physical structure helps control when and how the drug comes out.
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Sources and further reading
This general lesson was generated from public source material. It explains a concept; it does not interpret a private paper or provide medical advice.