title: Critical factors in studying drug interactions.
mesh_terms: D000367:Age Factors; D002940:Circadian Rhythm; D004305:Dose-Response Relationship, Drug; D004333:Drug Administration Routes; D004347:Drug Interactions; D004361:Drug Tolerance; D004777:Environment; D006801:Humans; D010600:Pharmacology / Q000379:methods*; D012107:Research Design; D012621:Seasons; D012737:Sex Factors