| Term 
 
        | Synergistic drug interaction |  | Definition 
 
        | Occurs when two drugs result in an increased effect more than just the addition of both |  | 
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        | Term 
 
        | Pharmacodynamic drug interaction |  | Definition 
 
        | Drugs that interact at a common receptor site or that have additive or inhibitory effectors due to actions at different sites in an organ |  | 
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        | Term 
 | Definition 
 
        | Whenever one drug affects the pharmacokinetics, pharmacodynamics, efficacy, or toxicity of another drug |  | 
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        | Term 
 | Definition 
 
        | A person who metabolizes a certain drug–the rate of which is related to the metabolizing cytochrome P-450 enzyme–slower than others |  | 
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        | Term 
 | Definition 
 
        | The drug affected by the drug interaction |  | 
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        | Term 
 | Definition 
 
        | The drug causing the drug interaction |  | 
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        | Term 
 
        | Antagonistic drug interaction |  | Definition 
 
        | Occurs when one drug lessens the effects of another |  | 
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        | Term 
 | Definition 
 
        | Refers to a set of enzymes that metabolize numerous substrates via oxidation (Phase I reaction) |  | 
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        | Term 
 
        | Pharmacokinetic drug interaction |  | Definition 
 
        | Occurs when one drug alters the rate or extent of absorption, distribution, metabolism, or excretion of another drug; the result may be and increase or decrease in concentration of drug at the site of action |  | 
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        | Term 
 | Definition 
 
        | An inducer increases the metabolism of a substrate resulting in a decreased  level or effect of the substrate |  | 
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        | Term 
 | Definition 
 
        | Study of genetic cause of individual variations in drug response |  | 
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        | Term 
 | Definition 
 
        | …more broadly involves genome-wide analysis of the genetic determinant of drug efficacy and toxicity; includes the use of genomic technologies |  | 
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        | Term 
 | Definition 
 
        | A variation in DNA sequence present in <1% of the population |  | 
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        | Term 
 | Definition 
 
        | A variation in DNA sequence present in ≥ 1% of the population |  | 
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        | Term 
 | Definition 
 
        | A single nucleotide polymorphism |  | 
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        | Term 
 | Definition 
 
        | Occurs when a nucleotide change occurs yet the resultant amino acid is unchanged |  | 
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        | Term 
 | Definition 
 
        | Occurs when a nucleotide change occurs and there is a resultant amino acid change which can affect to efficacy and/or toxicity of a drug |  | 
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        | Term 
 | Definition 
 
        | One of the variant forma of a gene at a particular location on a chromosome |  | 
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        | Term 
 | Definition 
 
        | The two alleles that any individual has |  | 
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        | Term 
 | Definition 
 
        | The clinical presentation of an individual with a particular genotype |  | 
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