vardenafil vardenafil 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. vardenafilclinical datatrade nameslevitra, staxyn, vivanzaahfs/drugs.commonographmedlineplusa603035license data eu ema: by inn pregnancycategory au: b3 routes ofadministrationby mouthatc codeg04be09 (who) legal statuslegal status au: s4 (prescription only) uk: pom (prescription only) us: ℞-only in general: ℞ (prescription only) pharmacokinetic databioavailability15%protein binding95%metabolismliver (cyp3a4)elimination half-life4–5 hoursexcretionbile ductidentifiers iupac name 4--9-methyl-7-propyl-3,5,6,8-tetrazabicyclonona-3,7,9-trien-2-one cas number224785-90-4 ypubchem cid110634iuphar/bps7320drugbankdb00862 ychemspider99300 yuniiuce6f4125hkeggd08668chemblchembl1520 ycomptox dashboard (epa)dtxsid3048318 echa infocard100.112.672 chemical and physical dataformulac23h32n6o4smolar mass488.61 g·mol−13d model (jsmol)interactive image smiles o=c2\n=c(/nn1c(nc(c12)c)ccc)c3cc(ccc3occ)s(=o)(=o)n4ccn(cc)cc4 inchi inchi=1s/c23h32n6o4s/c1-5-8-20-24-16(4)21-23(30)25-22(26-29(20)21)18-15-17(9-10-19(18)33-7-3)34(31,32)28-13-11-27(6-2)12-14-28/h9-10,15h,5-8,11-14h2,1-4h3,(h,25,26,30) ykey:seckrcoljrrggv-uhfffaoysa-n y (verify) vardenafil 4 tablets blister 20 mg medical use main article: pde5 inhibitor vardenafil's indications and contraindications are the same as with other pde5 inhibitors; it is closely related in function to sildenafil citrate (viagra) and tadalafil (cialis). the difference between the vardenafil molecule and sildenafil citrate is a nitrogen atom's position and the change of sildenafil's piperazine ring methyl group to an ethyl group. tadalafil is structurally different from both sildenafil and vardenafil. vardenafil's relatively short effective time is comparable to but somewhat longer than sildenafil's. vardenafil also does not have an effect on pde6, which means that it does not have vision adverse effects. beyond its indications for erectile dysfunction, vardenafil may be effective in the treatment of premature ejaculation, where it may significantly increase the time from penetration to ejaculation. adverse reactions the common, adverse drug reactions (side effects) are the same as with other pde5 inhibitors. the frequent vardenafil-specific side-effect is nausea; the infrequent side effects are abdominal pain, back pain, photosensitivity, abnormal vision, eye pain, facial edema, hypotension, palpitation, tachycardia, arthralgia, myalgia, rash, itch, and priapism. one possibly serious, but rare, side effect with vardenafil is heart attack. also, in rare cases, vardenafil use may cause priapism, a very painful emergency condition that can cause impotence if left untreated. in october 2007, the u.s. food and drug administration (fda) announced that a warning about possible deafness (sudden hearing loss) would be added to the drug labels of vardenafil, and other pde5 inhibitors. interactions vardenafil should not be used by people taking nitrate medications, because combining them with vardenafil might provoke potentially life-threatening hypotension (low blood pressure). further, vardenafil causes lengthening of the qt interval. therefore, it should not be taken by people taking other medications that affect the qt interval (such as amiodarone). history vardenafil was co-marketed by bayer pharmaceuticals, glaxosmithkline, and schering-plough under the brand name levitra. as of 2005, the co-promotion rights of gsk on levitra have been returned to bayer in many markets outside the us. in italy, bayer sells vardenafil as levitra and gsk sells it as vivanza. thus, because of european union trade rules, parallel imports might result in vivanza sold next to levitra in the eu. an orally disintegrating form, marketed as staxyn and levitra soft, has been gaining approvals in countries such as the united states and canada. tainted supplements the us food and drug administration (fda) has found vardenafil and other synthetic pde5 inhibitors in numerous products marketed as "herbal" supplements or "all natural" products for male enhancement.