A Pilot Study of Sildenafil in COVID‐19  Drug: Sildenafil citrate tablets (G1)  China/COVID‐19  10, all, 18 years and older  Treatment  Experimental group: sildenafil citrate tablet 0.1 g/day for 14 days  Not applicable  Primary (14 days): rate of disease remission, rate of entering the critical stage, time of entering the critical stage
Secondary (14 days): rate of no fever, rate of respiratory symptom remission, rate of lung imaging recovery, rate of C‐reactive protein (CRP) recovery, rate of Biochemical criterion (CK, ALT, Mb) recovery, rate of undetectable viral RNA (continuous twice), time for hospitalization, rate of adverse event  NCT04304313/Recruiting, Feb 9‐Nov 9 2020