A patient taking several medicines reports dizziness after a new sedative is started. Which explanation is most appropriate?
Correct answer: A. The medicines may have additive effects
- A. The medicines may have additive effects
- B. The new drug has no systemic absorption
- C. The symptom proves drug dependence
- D. The medicines must have identical names
Explanation
Drug interactions may produce additive effects when medicines with similar actions, such as central nervous system depression, are combined. Dizziness does not by itself prove dependence, and different medicines can interact without having identical names.
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About Principles of Pharmacology
Pharmacology examines drug sources, names, dosage forms, mechanisms of action, absorption, distribution, metabolism and excretion. Questions cover pharmacokinetics versus pharmacodynamics, therapeutic effects, adverse reactions, contraindications, drug interactions, tolerance, dependence and the safety responsibilities of the nurse.
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