A patient has been taking a drug that has a protein-binding effect of 75%. The provider adds a new medication that has a protein-binding effect of 90%. The nurse will expect
a. decreased drug effects of the first drug.
b. decreased therapeutic range of the first drug.
c. increased drug effects of the first drug.
d. increased therapeutic range of the first drug.
ANS: C
Adding another highly protein-bound drug will displace the first drug from protein-binding sites and release more free drug increasing the drug's effects. This does not alter the therapeutic range, which is the serum level between drug effectiveness and toxicity.
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