I-Symphytroph, eyaziwa nangokuthi i-pymphothion, i-non-systemic organophosphorus insecticide ephumelela kakhulu ngokumelene nezinambuzane ze-dipteran. Ibuye isetshenziselwe ukulawula ama-ectoparasites futhi inemiphumela ebalulekile ezimpukaneni zesikhumba. Iyasebenza kubantu nemfuyo. Ubuthi obuphezulu. Kunganciphisa umsebenzi we-cholinesterase egazini lonke, okubangela ikhanda elibuhlungu, isiyezi, ukucasuka, isicanucanu, ukuhlanza, ukujuluka, ukuqhinqa, i-miosis, ukudlikizeka, i-dyspnea, i-cyanosis. Ezimweni ezimbi kakhulu, kuvame ukuhambisana ne-pulmonary edema kanye ne-cerebral edema, okungaholela ekufeni. Ekuhlulekeni kokuphefumula.