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“Drug interactions of calcium antagonists occur with other cardiovascular agents such as α-adrenergic blockers, β-adrenergic blockers, digoxin, quinidine , and disopyramide.”
“ Quinidine pretreatment significantly inhibited the aromatization of nifedipine to its major first‐pass pyridine metabolite (M‐0) and prolonged the elimination half‐life of the calcium channel antagonist , both by about 40%.”
Clinical pharmacology and therapeutics • 1991 | View Paper
“Moreover, treatment of these diseases with such interactive medications as quinidine and calcium channel blockers may increase the serum level of digoxin.”