Journal
POLYMERS
Volume 13, Issue 20, Pages -Publisher
MDPI
DOI: 10.3390/polym13203512
Keywords
erectile dysfunction; Kolliphor (R) P188; Kollidon (R) 30; Kollidon (R)-VA64; polymer; sildenafil citrate
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Funding
- Prince Sattam Bin Abdulaziz University, Al-Kharj Saudi Arabia
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Sildenafil citrate (SLC) is a commonly used medication for erectile dysfunction (ED), but its poor solubility limits its effectiveness. By preparing and evaluating solid dispersions (SDs) with hydrophilic polymers, especially SLC-KVA64, this study found significant improvements in dissolution and efficacy in male rats, indicating a potential strategy for enhancing the therapeutic efficacy of SLC.
Sildenafil citrate (SLC) is a frequently used medication (Viagra (R)) for the treatment of erectile dysfunction (ED). Due to its poor solubility, SLC suffers from a delayed onset of action and poor bioavailability. Hence, the aim of the proposed work was to prepare and evaluate solid dispersions (SDs) with hydrophilic polymers (Kolliphor (R) P188, Kollidon (R) 30, and Kollidon (R)-VA64), in order to enhance the dissolution and efficacy of SLC. The SLC-SDs were prepared using a solvent evaporation method (at the ratio drug/polymer, 1:1, w/w) and characterized by Differential Scanning Calorimetry (DSC), Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Scanning electron microscope (SEM), drug content, yield, and in vitro release studies. Based on this evaluation, SDs (SLC-KVA64) were optimized, with a maximum release of drug (99.74%) after 2 h for all the developed formulas. The SDs (SLC-KVA64) were further tested for sexual behavior activity in male rats, and significant enhancements in copulatory efficiency (81.6%) and inter-copulatory efficiency (44.9%) were noted in comparison to the pure SLC drug, when exposed to the optimized SLC-KVA64 formulae. Therefore, SD using Kollidon (R)-VA64 could be regarded as a potential strategy for improving the solubility, in vitro dissolution, and therapeutic efficacy of SLC.
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