Abstract
The primary choice of drugs to treat Leishmaniasis are the pentavalent antimony-based compounds, nevertheless these drugs presented undesirable side effects. However, safe natural compounds could be used in combination with these drugs to enhance their activity. The aim of this study was to evaluate the sinergism of capsaicin and piperine, isolated from Capsicum frutescens and Piper nigrum, respectively, in combination with meglumine antimoniate against Leishmania infantum promastigote and amastigote forms. Each compound was mixed with the standard drug in several percentage mixtures and tested at various concentrations. Capsaicin and piperine in combination with meglumine antimoniate (25% + 75%) showed better anti-leishmanial activity with EC50 = 4.31 ± 0.44 e 7.25 ± 4.84 μg/mL against promastigote and amastigote forms, respectively. The results point that these spice alkaloids are suitable compounds to be administered in combinations with antileishmanial drugs to improve their action.
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