Pharmacology Sildenafil’s mechanism of action can be best described as: A β–adrenoceptor blocking agent B Selective inhibitor of phosphodiesterase type 5 C Inhibits reuptake of both serotonin and nor adrenaline D Selective serotonin reuptake inhibitor 💡 Explanation Sildenafil's mechanism of action can be best described as: ✓ Correct Answer: B. Selective inhibitor of phosphodiesterase type 5