A system that adjusts an intake target of a drug indicating an amount of the drug to be taken by a person to be medicated, the system configured to: acquire intake information of a drug taken by a person to be medicated based on an intake target of the drug; determine, based on the intake information, an occurrable timing at which a side effect of the drug taken is likely to occur; present inquiry information that inquires whether a side effect has occurred in the person to be medicated at the occurrable timing; acquire response information that is input in response to the inquiry and indicates whether a side effect has occurred; change the intake target of the drug based on the response information; and present the intake target changed.