Which of the following combinations does not show synergistic action?
AStreptomycin plus penicillin
BRifampicin plus dapsone
CPenicillin plus tetracycline
DPenicillin plus sulfonamide
A patient on digoxin therapy presents with atrial fibrillation and controlled ventricular rate. Upon evaluation, the patient's serum digoxin levels are elevated compared to previous values. Which of the following concomitant medications is most likely to have contributed to the enhanced digoxin toxicity?
ATriamterene
BKCL
CAtenolol
DClarithromycin
EAmiodarone
At toxic doses, zero-order kinetics is seen in which of the following substances?
APhenytoin
BValproate
CCarbamazepine
DPenicillin
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