Sildenafil is contraindicated in patients taking the
following class of drugs:
A. α-adrenergic blockers
B. β-adrenergic blockers
C. Organic nitrates
D. Angiotensin converting enzyme inhibitors
following class of drugs:
A. α-adrenergic blockers
B. β-adrenergic blockers
C. Organic nitrates
D. Angiotensin converting enzyme inhibitors