title: A single dose of Sildenafil does not enhance FeNO: a randomised, cross-over and placebo-controlled study.
abstract: Monitoring of asthma control can be performed with different means including measurement of the concentration of nitric oxide (NO) in exhaled air. Due to its action on the NO-metabolism; we hypothesized that the intake of Sildenafil might augment and falsify the NO-values in exhaled air of subjects taking the drug to treat erectile dysfunction. This randomised, placebo-controlled cross-over study including 10 male non-asthmatic volunteers taking a single dose of 50 mg Sildenafil did not confirm this assumption in non-asthmatic subjects. We cannot think of any reason why asthmatics should behave differently. On the basis of these results, it does not seem necessary to ask asthma patients with elevated NO-values if they had taken any selective inhibitor of the cGMP-specific phosphodiesterase Type 5 as Sildenafil prior to the test.
authors.affiliation: Zürcher Höhenklinik Davos, Klinikstrasse, CH-7272 Davos Clavadel, Switzerland. thomas.rothe@zhd.ch
authors.forename: Thomas
authors.initials: T
authors.lastname: Rothe
authors.forename: Werner
authors.initials: W
authors.lastname: Karrer
authors.forename: Christian
authors.initials: C
authors.lastname: Schindler
mesh_terms: D000280:Administration, Inhalation; D000328:Adult; D018592:Cross-Over Studies; D004305:Dose-Response Relationship, Drug; D007172:Erectile Dysfunction / Q000188:drug therapy*; D005541:Forced Expiratory Volume / Q000187:drug effects; D006801:Humans; D008297:Male; D008875:Middle Aged; D009569:Nitric Oxide / Q000378:metabolism*; D010879:Piperazines / Q000008:administration & dosage / Q000009:adverse effects*; D011687:Purines / Q000008:administration & dosage / Q000009:adverse effects; D000068677:Sildenafil Citrate; D013450:Sulfones / Q000008:administration & dosage / Q000009:adverse effects*; D014665:Vasodilator Agents / Q000008:administration & dosage / Q000009:adverse effects*; D055815:Young Adult
chemical_list: D010879:Piperazines; D011687:Purines; D013450:Sulfones; D014665:Vasodilator Agents; D009569:Nitric Oxide; D000068677:Sildenafil Citrate