All pairs

Ritonavir and Flecainide

Desk tier: Avoid together

Mechanism: moderate CYP2D6 inhibition of clearance (↑ exposure)

“NORVIR is contraindicated with drugs that are highly dependent on CYP3A for clearance”
Norvir (ritonavir), section 4 CONTRAINDICATIONS. DailyMed label

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All pairs for Ritonavir · Flecainide

Enzyme behind this pair: CYP2D6

Educational reference only. Not FDA-cleared. The Prescribing Information governs.