Table 2. Treatment-emergent adverse events during 6-months medication.

Adverse event	Group A (n=168)	Group B (n=82)
Headache, n (%)	9 (5.4)	5 (6.1)
Dizzy, n (%)	8 (4.8)	4 (4.9)
Facial flushing, n (%)	6 (3.6)	4 (4.9)
Palpitation, n (%)	6 (3.6)	2 (2.4)
Dyspepsia, n (%)	5 (3.0)	2 (2.4)
Diarrhea, n (%)	4 (2.4)	1 (1.2)
Acratia, n (%)	2 (1.2)	1 (1.2)
Abdominal pain, n (%)	1 (0.6)	0 (0)

Group A, sildenafil and doxazosin GITS combined therapy. Group B, sildenafil monotherapy. Values (n) shown are the numbers of patients affected (%).