Question 1

How does micronization improve drug bioavailability?

Accepted Answer

Micronization reduces solid drug particle size to less than 10 microns, significantly increasing the drug's surface area. This larger surface area facilitates faster dissolution and absorption in the body, enhancing bioavailability. The technique is particularly effective for poorly soluble drugs that require improved absorption rates.

Question 2

What role do surfactants play in enhancing drug solubility?

Accepted Answer

Surfactants enhance wetting and penetration of dissolution fluid into solid drug particles, breaking them down more efficiently. This process increases the drug's solubility and bioavailability by improving the interaction between the drug and the aqueous environment in the gastrointestinal tract.

Question 3

Why are salt forms of drugs more soluble than parent compounds?

Accepted Answer

Salt forms of drugs dissolve more readily than their parent compounds because they have improved ionic interactions with aqueous solutions. This enhanced solubility leads to better absorption rates and increased bioavailability, making salt formulations a practical strategy for drugs with poor water solubility.

Question 4

How can pH adjustment enhance drug solubility?

Accepted Answer

Adjusting the drug microenvironment's pH by adding buffers can enhance drug solubility by favoring the ionized form of the drug, which is typically more soluble in water. This method modifies the chemical environment to optimize the drug's dissolution characteristics and improve its bioavailability.

Question 5

What is the difference between anhydrates and hydrates in drug formulation?

Accepted Answer

Anhydrates are typically more soluble than hydrates, making them the preferred drug form when solubility enhancement is needed. The selection of the proper drug form significantly affects solubility and bioavailability, so choosing anhydrates over hydrates can improve therapeutic efficacy for poorly soluble drugs.

Question 6

How do polymers like PEG enhance bioavailability in solid dispersions?

Accepted Answer

Polymers such as PEG are utilized in solid dispersions of poorly water-soluble drugs to enhance their bioavailability. These polymers help maintain the drug's solubilized state, facilitating its absorption and effectiveness. Solid dispersions represent a key strategy in bioavailability enhancement determination and conceptual approaches.

Question 7

What is nanonization and how does it differ from micronization?

Accepted Answer

Nanonization reduces drug particle size to between 200-600 nanometers, representing a more extreme size reduction than micronization, which targets particles below 10 microns. Both techniques increase surface area for faster dissolution, but nanonization provides even greater enhancement of drug solubility and bioavailability for challenging formulations.

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