Solid-state dispersions employing urethan

Area of Science:

• Pharmaceutical Sciences
• Materials Science

Background:

• Poorly water-soluble drugs pose challenges in achieving effective therapeutic concentrations.
• Solid-state dispersions are a strategy to improve drug solubility and dissolution.
• Urethan polymers offer potential as matrices for drug delivery systems.

Purpose of the Study:

• To investigate the impact of urethan matrices on the dissolution rates of poorly water-soluble drugs.
• To compare the efficacy of solid-state dispersions versus physical mixtures with urethan.
• To evaluate drug content in solution using different filtration methods.

Main Methods:

• Preparation of drug-urethan solid-state dispersions via heat fusion.
• Preparation of physical mixtures of drugs and urethan.
• Measurement of drug dissolution rates from prepared systems.
• Comparison of ultrafiltration and cotton filtration for determining dissolved drug content.

Main Results:

• Significant enhancement in initial dissolution rates observed for drugs in urethan solid-state dispersions.
• Marked increase in drug solubility for both solid dispersions and physical mixtures compared to pure drugs.
• Dissolution rate improvements were notable for griseofulvin, hydrocortisone, chloramphenicol, and acetaminophen.
• Physical mixtures showed over 50% of the dissolution enhancement seen in solid-state dispersions.

Conclusions:

• Urethan matrices, particularly through solid-state dispersions, effectively enhance the dissolution of poorly water-soluble drugs.
• Both solid-state dispersions and physical mixtures with urethan offer improved drug release profiles.
• The findings support the use of urethan in developing advanced drug delivery systems for poorly soluble compounds.