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Doctors also prescribe Cialis to treat symptoms related to an enlarged prostate, which is a medical condition called benign prostatic hyperplasia (BPH). Men who have enlarged prostates may have problems urinating and emptying their bladders. When men have both ED and BPH, Cialis can be taken to treat both conditions.diabetes, especially if you also have eye problems does viagra expire The results of the study then showed that improvements on erections among men when using 25 mg. was 63%, 74% success within those who take the 50 mg. and 82% achieved erections using the 100 mg Viagra. Based from the study, it also showed that during a 4-week period, between one-third to one-half of the Viagra users achieved a successful sexual activity. Moreover, the long-term Viagra studies reported that 88% of men Viagra users have had improved erections. Can tadalafil cause problems?

When a man is sexually stimulated, his body's normal physical response is to increase blood flow to his penis. This results in an erection. LEVITRA helps increase blood flow to the penis and may help men with ED get and keep an erection satisfactory for sexual activity. Once a man has completed sexual activity, blood flow to his penis decreases, and his erection goes away.Tell your doctor about all prescription, over-the-counter, and herbal medications you are taking before beginning treatment with Viagra. Inform your doctor if you are taking any blood pressure medications. Also, talk to your doctor about your complete medical history, especially if you have heart disease, angina (chest pain), recently suffered a heart attack, stroke or life-threatening arrhythmia, if you have a physical deformation of your penis, sickle cell anemia, retinitis pigmentosa (eye disease that involves damage to the layer of tissue in the back of the eye, called the retina), or kidney, liver, or blood problems.

Contains Single oral doses of phosphodiesterase inhibitors have demonstrated transient dose-related impairment of color discrimination (blue/green), using the Farnsworth-Munsell 100-hue test, with peak effects near the time of peak plasma levels. This finding is consistent with the inhibition of PDE6, which is involved in phototransduction in the retina. In a study to assess the effects of a single dose of tadalafil 40 mg on vision (N=59), no effects were observed on visual acuity, intraocular pressure, or pupilometry. Across all clinical studies with Cialis, reports of changes in color vision were rare (<0.1% of patients). levitra buy online Vardenafil HCl is designated chemically as piperazine, 1-[[3-(1,4-dihydro-5-methyl-4-oxo-7-propylimidazo[5,1-f ][1,2,4]triazin-2-yl)-4-ethoxyphenyl]sulfonyl]-4-ethyl-, monohydrochloride and has the following structural formula:The chemical designation is pyrazino[1′,2′:1,6]pyrido[3,4-b]indole-1,4-dione, 6-(1,3-benzodioxol-5-yl)-2,3,6,7,12,12a-hexahydro-2-methyl-, (6R,12aR)-. It is a crystalline solid that is practically insoluble in water and very slightly soluble in ethanol.2.5 mg vardenafilEF Domain Score

CrCl <30 mL/min: Not recommended best herbal viagra 7 users found this comment helpful. Did you? Yes No Report as inappropriate

Physicians should consider the cardiovascular status of their patients, since there is a degree of cardiac risk associated with sexual activity. Therefore, treatments for erectile dysfunction, including Cialis, should not be used in men for whom sexual activity is inadvisable as a result of their underlying cardiovascular status. Patients who experience symptoms upon initiation of sexual activity should be advised to refrain from further sexual activity and seek immediate medical attention.

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Studies in vitro have shown that tadalafil is a selective inhibitor of PDE5. PDE5 is an enzyme found in corpus cavernosum smooth muscle, vascular and visceral smooth muscle, skeletal muscle, platelets, kidney, lung, and cerebellum. The effect of tadalafil is more potent on PDE5 than on other phosphodiesterases. Tadalafil is >10,000-fold more potent for PDE5 than for PDE1, PDE2, and PDE4 enzymes which are found in the heart, brain, blood vessels, liver, and other organs. Tadalafil is >10,000-fold more potent for PDE5 than for PDE3, an enzyme found in the heart and blood vessels. This selectivity for PDE5 over PDE3 is important because PDE3 is an enzyme involved in cardiac contractility. Additionally, tadalafil is approximately 700-fold more potent for PDE5 than for PDE6, an enzyme which is found in the retina and is responsible for phototransduction. Tadalafil is also >10,000-fold more potent for PDE5 than for PDE7 through PDE10.

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