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MBCQ is a cGMP-specific phosphodiesterase PDE5 inhibitor.

The phosphodiesterase type 5 inhibitor (PDE5 inhibitor) is an agent used to inhibit the degradative action of cGMP-specific PDE5 on cyclic GMP in the smooth muscle cells lining the blood vessels supplying the corpus cavernosum of the penis. PDE5 drugs are used in the treatment of erectile dysfunction and were the first effective oral treatment for this condition. Sinve PDE5 is also present in the arterial wall smooth muscle within the lungs, PDE5 inhibitors have also been applied for the pulmonary hypertension treatment.

In vitro: In previous study, it was found that the addition of MBCQ to the blood vessle samples could lead to an 80 to 85% inhibition of PDE activity, indicating that most of the activity present in these blood vessels could be attributed to PDE5.

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