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Vardenafil is an oral drug used to treat impotence (the inability to attain or maintain penile erection). It is a phosphodiesterase inhibitor that is similar to Sildenafil (Viagra).

For most individuals, the recommended dose of vardenafil is 10 mg per day taken 60 minutes before intercourse. If there is no response or side effects, the dose may be increased to 20 mg or, if there are side effects, it may be reduced to 5 mg. Individuals 65 years of age or older should begin therapy with 5 mg. Individuals who are taking medications that increase the blood levels of vardenafil should start treatment with 2.5 to 5 mg of vardenafil. (See drug interactions.)

Vardenafil should be stored at room temp. between 15-30°C (59-86°F)

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The most common side effects of vardenafil are facial flushing (reddening), headaches, stomach upset, diarrhea, flu like symptoms and nausea. Vardenafil also may cause chest pain, low blood pressure, blurred vision and changes in color vision, abnormal ejaculation and priapism (painful erection).

The breakdown and elimination of vardenafil from the body is inhibited by erythromycin, ketoconazole (Nizoral), itraconazole (Sporanox), indinavir (Crixivan) and ritonavir (Norvir). Therefore, these drugs increase the concentration of vardenafil in the blood. If these drugs are being used at the same time as vardenafil, the dose of vardenafil should be reduced in order to avoid side effects from vardenafil.

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Bayer is a research-oriented corporate group whose various branches and subgroups work in the fields of health care, nutrition and innovative materials. Bayer employs 113,600 workers in 350 companies worldwide. Its global headquarters are in Leverkusen, Germany.