“…Many scientists have investigated the influence of P-gp inhibitors from natural sources (vasicine acetate, canthin-6-one, ergotamine, berberine, harmaline, reserpine, theobromine, chelerythrine, isorhamnetin, aegicerin, galbanic acid, orizabin, porphyrin, etc.) on the antimicrobial activity of antimicrobial agents that can increase their accumulation inside the cells and increase the antimicrobial action [ 61 , 62 , 69 , 72 , 94 , 121 , 124 , 174 , 186 , 224 , 232 , 236 , 258 ].…”