Sildenafil is the active ingredient in Viagra.
Viagra is a brand 비아그라 구입 name for 비아그라온라인약국 the medication containing sildenafil. Both are used to treat erectile 비아그라 효과 dysfunction, 정품 비아그라 but sildenafil is the generic version while Viagra is the brand 비아그라 효과 name version.