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A drug-drug interaction (DDI) is a pharmacokinetic or pharmacological influence of 1 medication on another that differs from the known or anticipated effects of each agent alone.1 A DDI may result in a change in either drug efficacy or drug toxicity for 1 or both of the interacting medications.2 Pharmacokinetic DDIs result in altered absorption, distribution, metabolism, or excretion of a medication. A pharmacodynamic DDI occurs when 1 medication modifies the pharmacological effect of another in an additive, a synergistic, or an antagonistic fashion.It is estimated that ≈2.8% of hospital admissions occur as a direct result of DDIs.3 However, the actual incidence of hospitalization secondary to clinically significant DDIs is likely to be highly underestimated because medication-related issues are more commonly reported as adverse drug reactions. Complex underlying disease states also may make recognizing a DDI more challenging, further contributing to a lower reported incidence. The overall clinical impact of a DDI can range from mild to life-threatening. Therefore, not all DDIs require a modification in therapy. The variability in the clinical significance of a DDI depends on both medication-specific and patient-specific factors. Medication-specific factors include the individual pharmacokinetic characteristics of each medication implicated in the DDI (eg, binding affinity, half-life [t1/2]), dose of the medications, serum concentrations, timing and sequence of administration, and duration of therapy. Patient-specific factors include age, sex, lifestyle, genetic polymorphisms causing differences in enzyme expression or activity, and disease impairment affecting drug metabolism (eg, hepatic or renal impairment, cardiac failure) or predisposition to differences in efficacy or safety (eg, statin intolerance in patients with a history of myopathy).Clinically significant DDIs are usually preventable. To optimize patient safety, healthcare providers must have an understanding of the mechanisms, magnitude, and potential consequences of any given DDI. Interpreting this information …

circulation

Recommendations for Management of Clinically Significant Drug-Drug Interactions With Statins and Select Agents Used in Patients With Cardiovascular Disease: A Scientific Statement From the American Heart Association