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Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.fever or chills canada drugs cialis Sildenafil is also used in both men and women to treat the symptoms of pulmonary arterial hypertension. This is a type of high blood pressure that occurs between the heart and the lungs. When hypertension occurs in the lungs, the heart must work harder to pump enough blood through the lungs. Sildenafil works on the PDE5 enzyme in the lungs to relax the blood vessels. This will increase the supply of blood to the lungs and reduce the workload of the heart. Patients should be stable on alpha-blocker therapy prior to initiating a PDE5 inhibitor. Patients who demonstrate hemodynamic instability on alpha-blocker therapy alone are at increased risk of symptomatic hypotension with concomitant use of PDE5 inhibitors.

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cialis nz Mild-to-moderate (CrCl 31-80 mL/min): 20 mg PO once daily initially; may be increased to 40 mg once daily on basis of tolerabilitySurgeryMale impotence can be caused by a variety of factors. A common reason, particularly among older men, is male impotence caused by reduced blood flow to the penis. As a PDE5 inhibitor, Viagra relaxes the muscles in the penis, allowing the vessels to dilate and fill with blood. The result is improved blood flow that facilitates an erection once you become sexually aroused. Viagra has been shown to work well for most men, regardless of age, even if you have had male impotence for several years.

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In vitro studies The dose may be increased to 20 mg or decreased to 5 mg, based on individual efficacy and tolerability. The maximum recommended dosing frequency is once per day in most patients.

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Uncommon but serious side effects include:Drug Interactions

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