Synergistic drug interaction is best described as 

When one medication binds to the same receptor as another and prevents that medication from producing its typical effect, this interaction is called

Which statement best analyzes why grapefruit juice increases plasma levels of some medications?

A patient takes a statin metabolized by CYP3A4 and drinks grapefruit juice daily. If grapefruit juice inhibits CYP3A4 and reduces hepatic statin clearance by 40%, estimate the percent increase in steady-state plasma concentration (Css), assuming Css is inversely proportional to clearance. Show calculations.

A patient with long-term heavy alcohol use requires a benzodiazepine for anxiety. How does cross tolerance affect initial benzodiazepine dosing and overdose risk?