PDE5 inhibitors

Sildenafil, sold under the brand name Viagra among others, is a medication used to treat erectile dysfunction and pulmonary arterial hypertension. It is also sometimes used off-label for the treatment of certain symptoms in secondary Raynaud's phenomenon. It is unclear if it is effective for treating sexual dysfunction in females. It can be taken orally (swallowed by mouth), intravenously (injection into a vein), or through the sublingual route (dissolved under the tongue). Onset when taken orally is typically within twenty minutes and lasts for about two hours.

thumb|Tadalafil - STADA T20 - 20 Milligram

thumb|Vardenafil 4 tablets Blister 20 mg Vardenafil, sold under the brand name Levitra among others, is a medication that is used for treating erectile dysfunction. It is a PDE5 inhibitor. It is taken by mouth.

Avanafil is a PDE5 inhibitor approved for erectile dysfunction by the FDA on April 27, 2012 and by EMA on June 21, 2013. Avanafil is sold under the brand names Stendra and Spedra. It was invented at Mitsubishi Tanabe Pharma, formerly known as Tanabe Seiyaku Co., and licensed to Vivus Inc., which partnered with Menarini Group to commercialise Spedra in over forty European countries, Australia, and New Zealand. Metuchen Pharmaceuticals obtained exclusive rights within the United States.

drug used to block the degradative action of cGMP-specific phosphodiesterase type 5 on cyclic GMP in the smooth muscle cells lining the blood vessels supplying various tissues

mammalian protein found in Homo sapiens

Icariin is a chemical compound classified as a prenylated flavonol glycoside, a type of flavonoid. It is the 8-prenyl derivative of kaempferol 3,7-O-diglucoside. The compound has been isolated from several species of plant belonging to the genus Epimedium which are commonly known as horny goat weed, Yin Yang Huo, and Herba epimedii. Extracts from these plants produce aphrodisiac effects, and are used in traditional Chinese medicine to enhance erectile function. == References ==

The drug udenafil is marketed under the trade name Zydena. It is within the PDE5 inhibitor class (which also includes avanafil, sildenafil, tadalafil, and vardenafil). Like other PDE5 inhibitors, it is used to treat erectile dysfunction. Udenafil was developed by Dong-A Pharmaceutical. It has fairly rapid onset of action (peak plasma concentration after 1 to 1.5 hours), and has long duration of action (plasma half-life of 11 to 13 hours). Udenafil's pharmacokinetics allows once-daily dosage (in addition to on-demand use). Typical doses are 100 and 200 mg. Udenafil is available in Korea, R

thumb|261px|right|class=skin-invert-image|Lodenafil carbonate

Aildenafil (methisosildenafil) is a synthetic drug that is a structural analog of sildenafil (Viagra). It was first reported in 2003. Like sildenafil, aildenafil is a phosphodiesterase type 5 inhibitor.

Mirodenafil is a PDE5 inhibitor used to treat erectile dysfunction. Developed by SK Chemicals Life Science, mirodenafil is marketed in Korea under the brand name Mvix, offered both as tablets (50 mg and 100 mg) and as orally dissolving films (50 mg).

Zaprinast was an unsuccessful clinical drug candidate that was a precursor to the chemically related PDE5 inhibitors, such as sildenafil (Viagra), which successfully reached the market. It is a phosphodiesterase inhibitor, selective for the subtypes PDE5, PDE6, PDE9 and PDE11. IC50 values are 0.76, 0.15, 29.0, and 12.0 μM, respectively.