Which medications in the drug class Oral Phosphodiesterase (Type 5) Enzyme Inhibitors are used in the treatment of Idiopathic Pulmonary Arterial Hypertension?

Updated: Jul 08, 2020
  • Author: Ronald J Oudiz, MD, FACP, FACC, FCCP; Chief Editor: Zab Mosenifar, MD, FACP, FCCP  more...
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Answer

Oral Phosphodiesterase (Type 5) Enzyme Inhibitors

Inhibition of the antiproliferative effects of the PDE-5 pathway, which regulates cyclic guanosine monophosphate hydrolysis, may be significant in the long-term treatment of pulmonary hypertension.

Despite concerns regarding ocular toxicity with chronic PDE-5 inhibition, no detrimental effects were observed during a pivotal phase III randomized clinical trial of sildenafil versus placebo for patients with pulmonary arterial hypertension.

A 52-week extension study demonstrated the long-term safety and efficacy of tadalafil in patients with pulmonary arterial hypertension.

Sildenafil (Revatio)

Sildenafil promotes selective smooth muscle relaxation in lung vasculature, possibly by inhibiting PDE-5. This results in subsequent reduction of blood pressure in pulmonary arteries and an increase in cardiac output.

Tadalafil (Adcirca)

Tadalafil is a PDE-5 inhibitor indicated for improving and increasing exercise capacity in patients with World Health Organization (WHO) class I PAH. This agent increases cyclic guanosine monophosphate (cGMP), which is the final mediator in the nitric oxide pathway.


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