Question 1

How do compression force and granulation methods affect tablet dissolution?

Accepted Answer

Compression force and granulation methods significantly impact dissolution rates during tablet manufacturing. High compression forces increase tablet density but reduce wettability, slowing dissolution. However, these forces may also cause drug particle deformation, increasing effective surface area and potentially enhancing dissolution. Different granulation methods yield tablets with varying dissolution rates, making these manufacturing parameters critical for controlling drug bioavailability.

Question 2

What role do excipients play in drug dissolution and absorption?

Accepted Answer

Excipients are inactive ingredients that ensure drug stability, functionality, and optimal bioavailability. Common excipients include vehicles, diluents, disintegrants, surfactants, binders, and lubricants. Water-miscible vehicles rapidly mix with body fluids, enabling fast drug absorption. Disintegrants break tablets apart, while surfactants promote wettability and aid dissolution. However, binders and lubricants can slow dissolution by reducing interparticle friction and tablet breakdown.

Question 3

How do diluents improve the dissolution of hydrophobic drugs?

Accepted Answer

Diluents elevate the dissolution rate of hydrophobic drugs by enhancing their interaction with aqueous body fluids. Hydrophilic diluents are particularly effective because their water-loving properties facilitate rapid mixing and dissolution of poorly soluble drug compounds. This strategic selection of diluent type is essential for optimizing bioavailability of drugs with low water solubility.

Question 4

Why do surfactants and disintegrants improve tablet dissolution?

Accepted Answer

Surfactants lower surface tension between ingredients, making them more miscible and promoting wettability of the drug particles. This enhanced wettability accelerates dissolution. Disintegrants break the tablet matrix into smaller fragments, increasing the effective surface area available for dissolution. Together, these excipients work to overcome barriers to drug dissolution and enhance absorption.

Question 5

What is the difference between hydrophilic and hydrophobic excipients in formulations?

Accepted Answer

Hydrophilic excipients are water-loving and enhance dissolution of poorly soluble drugs, while hydrophobic excipients are water-repelling and may hinder dissolution. Hydrophilic diluents facilitate rapid drug absorption by promoting mixing with body fluids. Conversely, hydrophobic binders and lubricants can slow dissolution by reducing tablet wettability and interparticle interactions. Selecting the appropriate excipient type is crucial for optimizing drug bioavailability.

Question 6

How do binders and lubricants affect tablet integrity and dissolution?

Accepted Answer

Binders hold powder particles together to form cohesive granules and tablets, ensuring structural integrity during manufacturing and handling. Lubricants reduce interparticle friction, preventing ingredients from sticking together and facilitating tablet ejection from molds. However, both binders and lubricants can negatively impact dissolution rates by creating barriers to water penetration and drug release.

Question 7

Why is wettability important for drug dissolution in solid dosage forms?

Accepted Answer

Wettability determines how readily water penetrates and interacts with tablet particles, directly influencing dissolution speed. High compression forces reduce wettability, slowing dissolution, while surfactants and hydrophilic excipients enhance wettability. Optimal wettability ensures rapid contact between drug particles and body fluids, facilitating dissolution and enabling effective mechanisms of drug absorption paracellular transcellular and vesicular transport.

العوامل المؤثرة على امتصاص الدواء: المعايير الصيدلانية

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