1. A computer implemented method for automatically assessing drug interactions while protecting patient privacy, the computer implemented method comprising: detecting, by a computer, a request to analyze drug interactions among a proposed medication and a plurality of current medications of a patient; requesting, by the computer, a medication information card from an identity selector to cause the identity selector to retrieve the medication information card from a portable electronic device that stores the medication information card in a storage device, wherein the medication information card stores data about the plurality of current medications of the patient, and wherein the medication information card is one of a plurality of medication information cards of the patient stored in the storage device of the portable electronic device that represent multiple identities of the patient; receiving, by the computer, the medication information card from the identity selector; determining, by the computer, the plurality of current medications from the medication information card; searching, by the computer, a drug interaction database for interactions among the proposed medication and the plurality of current medications; determining, by the computer, that there are interactions among the proposed medication and the plurality of current medications; determining, by the computer, that information about the plurality of current medications is not to be disclosed; displaying, by the computer, an indication that there are interactions among the proposed medication and the plurality of current medications while preserving confidentiality of the plurality of current medications; suggesting, by the computer, an alternative to the proposed medication based on the interactions among the proposed medication and the plurality of current medications; deleting, by the computer, a medication from the plurality of current medications of the patient based on an expiration date associated with the medication to form a deleted medication; and archiving, by the computer, the deleted medication in the medication information card stored in the storage device of the portable electronic device.