Korean Journal of Clinical Geriatrics

Table. 1. Table 1

Oral erectile dysfunction medicines classified by ingredient name in Korea

Ingredient	Sildenafil	Tadalafil	Vardenafil	Avanafil	Udenafil	Mirodenafil
Brand name	Viagra^Ⓡ	Cialis^Ⓡ	Levitra^Ⓡ	Stendra^Ⓡ	Zydena^Ⓡ	Mvix^Ⓡ
Introduction time	1998 FDA	2003 FDA	2003 FDA	2012 FDA	2005	2011
Manufacturer	Pfizer	Lilly	Bayer	Metuchen	Dong-A	SK chemicals
Formula	C₂₂H₃₀N₆O₄S	C₂₂H₁₉N₃O₄	C₂₃H₃₂N₆O₄S	C₂₃H₂₆ClN₇O₃	C₂₅H₃₆N₆O₄S	C₂₆H₃₇N₅O₅S
T max	0.95 hr	2 hr	0.8 hr	0.75 hr	0.76 hr	1.4 hr
T 1/2	3.98 hr	17.5 hr	4.7 hr	5.1 hr	9.88 hr	2.5 hr

FDA, Food and Drug Administration.