The present invention enables a health care professional to identify more suitably for a patient at least one of the dosage form and dosage of a drug. A method according to the present invention is used to determine at least one of the dosage form and dosage of a drug which can be administered to a patient, the method including the following steps carried out by a processor: a step for acquiring electrocardiogram data showing an electrocardiogram of the patient to whom a drug has been administered according to a dosage and a dosage form and who is going about daily life; and a step for determining, on the basis of the electrocardiogram data, whether waveform anomalies which can be evaluated from the electrocardiogram may be occurring in the patient, and outputting, on the basis of the result of the determination, information pertaining to whether it is possible to change at least one of the dosage and the dosage form.
