The present invention provides prediction information for an effect of taking a medicine on a biometric value. A medication assistance information providing device includes a first acquisition unit configured to acquire prescription information related to a medicine that a user plans to take, a second acquisition unit configured to acquire dosing adherence rate information including a dosing adherence rate representing a medication achievement of the user with respect to a dosage specified by the prescription information, a third acquisition unit configured to acquire change prediction information for a biometric value of the user relative to the dosing adherence rate on the basis of the prescription information and the dosing adherence rate information, and a first provision unit configured to provide the change prediction information for the biometric value.