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It contains the same active ingredient as Levitra and can begin working in about 15 minutes. Viagra takes around 30 minutes to become effective and lasts about 4 hours. Cialis lasts much longer -- up generif 36 hours in some cases. Stendra can start doing its thing in as little as 15 minutes, and its effects last up to 6 hours. Can I Make a Switch.

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Anemia usually presents as nocturia.

Studies examining L-arginine's effectiveness against impotence have yielded mixed results. A 1999 trial published in the online journal BJU International found that high doses of L-arginine can help improve sexual function, but only in men with abnormal nitric oxide metabolism, such as that associated with cardiovascular disease. In another study, published in 2003 in the Journal of Sex amp; Marital TherapyBulgarian scientists reported that ED sufferers who took L-arginine along with the pine extract pycnogenol saw major improvements in sexual function with no side effects. Arginine can be helpful, says Geo Espinosa, ND, director of the Integrative Urological Center at NYU Langone Medical Center. Espinosa says that men with known cardiovascular problems should take it only with a doctor's supervision; L-arginine can interact with some medications. Take the Impotence (ED) Quiz.

Yes. And pay attention to the 4-hour limit, you will not like what this stuff can do to you if the blood vessels get damaged. Hope this helps.]