Because traditional oral medicines introduce the drug directly into the body they tend to have strong side effects, and may be toxic to the organs. Painkillers, for example, can often damage the kidneys.
由於傳統的口服療法為藥劑直接進入人體內，藥的副作用較大，毒性經常傷害到人體器官，例如止痛藥的使用就經常傷害到腎臟。