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Product Type HUMAN PRESCRIPTION DRUG LABEL Item Code (Source) NDC:0173-0830Vardenafil is metabolized predominantly by the hepatic enzyme CYP3A4, with contribution from the CYP3A5 and CYP2C isoforms. The major circulating metabolite, M1, results from desethylation at the piperazine moiety of vardenafil. M1 is subject to further metabolism. The plasma concentration of M1 is approximately 26% that of the parent compound. This metabolite shows a phosphodiesterase selectivity profile similar to that of vardenafil and an in vitro inhibitory potency for PDE5 28% of that of vardenafil. Therefore, M1 accounts for approximately 7% of total pharmacologic activity. viagra price -- Learn More About Complications & Prevention >>Tell your doctor about all your current medicines and any you start or stop using, especially:

Take Viagra exactly as your healthcare provider tells you to take it.have had heart surgery within the last 6 months

LEVITRA is a prescription medicine taken by mouth for the treatment of erectile dysfunction (ED) in men. cialisis hydroxypropylcelluloseSeek emergency medical attention or call the Poison Help line at 1-800-222-1222.?headache

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In rare instances, men taking prescription ED tablets, including CIALIS, reported a sudden decrease or loss of vision or hearing (sometimes with ringing in the ears and dizziness). It’s not possible to determine if these events are related directly to the ED tablets or to other factors. If you have a sudden decrease or loss of vision or hearing, stop taking any ED tablet, including CIALIS and call a healthcare provider right away.

shelf life of viagra Usted no debe usar vardenafil si es alérgico a éste.Si durante la actividad del sexo, usted nota mareo, náusea, o tiene dolor, entumecimiento, o cosquilleo en su pecho, brazos, cuello, o quijada, pare de hacer la actividad y llame de inmediato a su médico. Le puede estar ocurriendo un efecto secundario de gravedad que causa sildenafil.

Three studies were conducted in men to assess the potential effect on spermatogenesis of CIALIS 10mg (one 6-month study) and 20mg (one 6-month and one 9-month study) administered daily. In two of these studies decreases were observed in sperm count and concentration related to tadalafil treatment of unlikely clinical relevance. These effects were not associated with changes in other parameters, such as motility, morphology, and FSH.