Table 2.

The dosage regimens of Epimedium sagittatum (Sieb. et Zucc.) Maxim extract and sildenafil administration ^a.

Treatment group	Dose of oral Epimedium sagittatum (Sieb. et Zucc.) Maxim extract b	No. of herbal doses	Sildenafil dose
1 c	None	0	10 mg/kg
2	1 g/kg/day, 2h before sildenafil administration	1	10 mg/kg
3	1 g/kg/day	3	10 mg/kg
4	1 g/kg/day	3	30 mg/kg
5	2 g/kg/day	3	10 mg/kg
6	2 g/kg/day	3	30 mg/kg

^a Each group contained six rats. ^bEpimedium sagittatum (Sieb. et Zucc.) Maxim extract was suspended in 2% carboxymethyl cellulose (1 g/mL). ^c Group 1 received vehicle (2% carboxymethyl cellulose, 1 g/mL) for 3 days as the control group