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indigestionDuring sexual activity, if you become dizzy or nauseated, or have pain, numbness, or tingling in your chest, arms, neck, or jaw, stop and call your doctor right away. You could be having a serious side effect of vardenafil.

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medicines called HIV protease inhibitors, such as ritonavir (Norvir), indinavir sulfate (Crixivan), saquinavir (Fortovase or Invirase) or atazanavir sulfate (Reyataz)Dosage and direction

how long does viagra take to work Viagra (Sildenafil Citrate) is the first medication used for the treatment of erectile dysfunction ever to be approved by FDA. Shortly after its introduction to the market in 1998, it became #1 aid for men suffering from erection disorders and looking for something to help them power up their libido. Even though several other meds (Cialis, Levitra) managed to get FDA approval several years later, Viagra still remains unrivaled when it comes to the total number of sales and the total number of satisfied customers.Inform patients that in some patients concomitant use of PDE5 inhibitors, including Levitra, with alpha-blockers can lower blood pressure significantly leading to symptomatic hypotension (for example, fainting). Patients prescribed Levitra who are taking alpha-blockers should be started on the lowest recommended starting dose of Levitra [see Dosage and Administration (2.4) and Drug Interactions (7)]. Patients should be advised of the possible occurrence of symptoms related to postural hypotension and appropriate countermeasures. Patients should be advised to contact the prescribing physician if other anti-hypertensive drugs or new medications that may interact with Levitra are prescribed by another healthcare provider.vision changes or sudden vision loss; or

difficult or labored breathingSkin and appendages: erythema, rashDuring the 24-hour period after 8 p.m. dosing, 17 subjects were categorized as outliers following administration of tadalafil and 7 subjects following placebo. Of these, 10 and 2 subjects were outliers due to systolic BP <85 mm Hg, while 15 and 5 subjects were outliers due to a decrease from baseline in systolic BP of >30 mm Hg, following tadalafil and placebo, respectively.