Source:http://linkedlifedata.com/resource/umls/id/C0001552
MSH: Agents that aid or increase the action of the principle drug (DRUG SYNERGISM) or that affect the absorption, mechanism of action, metabolism, or excretion of the primary drug (PHARMACOKINETICS) in such a way as to enhance its effects.,NCI: An agent that enhances the activity or therapeutic effect of another pharmacologic substance without having much, if any, therapeutic impact by itself.