Table 1

Pulmonary function test parameters before and 2 h after taking 50 mg sildenafil

Parameter	Before taking 50 mg sildenafil (baseline value)	2 h after taking 50 mg sildenafil
FEV₁ L	2.22±0.39	2.54±0.36^*
FEF_25–75% L	1.25±0.32	1.53±0.36^*
PEFR L·s⁻¹	4.96±0.80	5.59±0.61^*

Data are presented as mean±sd. *: p<0.05.