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levitra vs viagra:
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levitra vs viagra Atients' ability to achieve and maintain a penile erection. The recommended dose is 10 mg taken 1 hour before sexual activity. A higher dose of 20 mg is available for patients whose response to the 10 mg dose is not adequate. Two lower doses (2.5 mg and 5.0 mg) are also available and may be necessary for patients taking other medicines or having medical conditions that may decrease the body's ability to metabolize vardenafil (Levitra). Levitra should not be used more than once a day. Levitra should not be used with nitrates (such as nitroglycerin tablets or patches) or with alpha-blockers (medicines that may be used to treat benign prostatic hyperplasia and levitra vs viagra.
levitra vs viagra Or high blood pressure such as tamsulosin levitra vs viagra, terazosin levitra vs viagra, doxazosin levitra vs viagra, and alfuzosin) because the combination of an alpha-blocker with Levitra may significantly lower the blood pressure and lead to fainting in some men. Currently levitra vs viagra, there is no information available to support the safety of even the lower doses of vardenafil taken together with alpha-blockers. In addition levitra vs viagra, Levitra should not be used in patients who have a rare heart condition known as "prolongation of the QT interval" because of the possibility of producing abnormal heart rhythm. Because some drugs may affect the metabolism of Levitra levitra vs viagra, patients should inform their doctors that they are taking Levitra and they should not begin taking new medicines without informing their doctor. For example levitra vs viagra, patients taking erythromycin should not take more than a 5 mg dose of Levitra and a maximum dose of 2.5 mg Levitra once every 72 hours is the maximum recommended dose for patients who are taking the protease inhibitor ritonavir (Norvir) for HIV AIDS. Levitra should not be taken by men in whom sexual activity is inadvisable because of their underlying cardiovascular status (heart condition). Patients should inform their doctor about any heart problems they have experienced before taking Levitra. Levitra is not recommended in patients who have suffered a heart attack o.
levitra vs viagra and they should not begin taking new medicines without informing their doctor. For example levitra vs viagra, patients taking erythromycin should not take more than a 5 mg dose of Levitra and a maximum dose of 2.5 mg Levitra once every 72 hours is the maximum recommended dose for patients who are taking the protease inhibitor ritonavir (Norvir) for HIV AIDS. Levitra should not be taken by men in whom sexual activity is inadvisable because of their underlying cardiovascular status (heart condition). Patients should inform their doctor about any heart problems they have experienced before taking Levitra. Levitra is not recommended in patients who have suffered a heart attack or.
levitra vs viagra 
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Entists responsible. The nitric oxide system causes relaxation of smooth muscle in blood vessel walls, ie, vasodilation, in various organ systems. The direct intracellular mediator of the nitric oxide pathway is cGMP. PDE catalyzes the degradation of cGMP. This pathway is active in numerous organ systems, and as of this writing, a number of different PDEs are known. The various PDEs differ in their physiologic roles and tissue distribution. Type 5 PDE is concentrated in the penile smooth muscle of the corpus cavernosum, where its normal function is to inhibit erection by degradation of cGMP, the mediator of erection. Viagra and the new drugs Cialis and Levitra all inhibit PDE-5, which is an inhibitor for corporal smooth muscle relaxation, resulting in increased blood flow in the penis in response to sexual stimulation. Comparison of Viagra, Cialis, & Levitra No head-to-head trial comparing the 3 PDE inhibitors has been performed. However, some differences between the 3 are basic: a table has been created to illustrate the major differences. An obvious proviso is that extensive data are available on Viagra (more than 20 million men treated, more than 1100 peer-reviewed articles as of Feb. & 8217;03), but only limited data on Cialis and Levitra. Drs. Gresser and Gleiter from the U. Tubingen in Germany have compared the three drugs via literature review (Eur. J. Med. Res. 7:435, 2002) In brief, efficacy is approximately 70% with all 3 drugs. The side effect profile is similar among the 3 drugs, except that blue discoloration of vision (overlap with PDE-6 in the retina) is
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