evaluation of poloxamer forming gels for bedaquiline fumarate salt and pharmacokinetics following intramuscular injection in rats.
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2019
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Abstract
The objective of this study was to evaluate and drug release from forming gels prepared with poloxamer 338 (P338) and/or 407 (P407) in N-methyl-2-pyrrolidone (NMP)/water mixtures for the model compound bedaquiline fumarate salt. The impact of total poloxamer concentration (20%-25% (w/w)), P338/P407 ratio (100/0%-0/100% (w/w)) and NMP/water ratio (0/100%-25/75% (v/v)) on gel point temperature (GPT) was investigated via a design of experiments (DoE), showing that GPT decreased mainly with increasing poloxamer concentration and decreasing P338/P407 ratio, while the relation with NMP/water ratio was more complex resulting in a flexion. Based on the DoE, four formulations with 10 mg/g bedaquiline fumarate salt, a fixed NMP/water ratio of 25/75% (v/v) and varying total poloxamer concentration and P338/P407 ratio were selected for evaluation of gel erosion . The fastest eroding formulation had the lowest total poloxamer concentration (20% (w/w)) and the lowest P338/P407 ratio (20.4/79.6% (w/w)), while the formulation with the highest total poloxamer concentration (23.5% (w/w)) and highest P338/P407 ratio (100/0% (w/w)) showed the lowest gel erosion rate. These fast and slow eroding formulations showed a similar trend for drug release and pharmacokinetics after intramuscular (IM) injection in rats. t of the IM administered poloxamer forming gels was about 6 h and a short-term sustained drug release was observed in rats up to 24 h after dosing, similar to a solution of bedaquiline fumarate salt in polyethylene glycol (PEG400)/water. In conclusion, IM administration of the evaluated poloxamer forming gels may be useful for drugs that require a short-term sustained release, but is not able to extend drug release rates up to weeks or months.
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