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The inhibition of phosphodiesterase type 5 (PDE5) by vardenafil enhances erectile function by increasing the amount of cGMP. Vardenafil is rapidly absorbed with absolute bioavailability of approximately 15%. Vardenafil is metabolized predominantly by the hepatic enzyme CYP3A4, with contribution from the CYP3A5 and CYP2C isoforms. The major circulating metabolite, M1, results from desethylation at the piperazine moiety of vardenafil. M1 shows a phosphodiesterase selectivity profile similar to that of vardenafil and an in vitro inhibitory potency for PDE5 28% of that of vardenafil. After oral administration, vardenafil is excreted as metabolites predominantly in the feces (approximately 91-95% of administered oral dose) and to a lesser extent in the urine (approximately 2-6% of administered oral dose). Symptoms of overdose include vision changes and back and muscle pain. Affected organisms Humans and other mammals Pathways Not Available Pharmacogenomic Effects/ADRs Browse all" title="About SNP Mediated Effects/ADRs" href="javascript:void(0);"> Levitra. Levitra® is a type of medication known as a PDE5 inhibitor that is used to treat erectile dysfunction. It comes in several different doses and is taken as-needed. Disclaimer: The information provided on this page is not a substitute for professional medical advice, diagnosis, or treatment. If you have any questions or concerns about your health, please talk to a doctor. Levitra® functions similarly to Viagra®, however it comes in different doses, has an increased risk of a change seen on EKG known as QT prolongation (which can lead to irregular heartbeats, which can be dangerous), and has a decreased risk of causing the bluish visual tint that is sometimes experienced by Viagra® users. For erectile dysfunction, Levitra® should be taken without food at least 30-60 minutes before sex and its effects last up to 8 hours. Serious side effects include an erection lasting more than 4 hours, sudden vision loss in one or both eyes, and sudden hearing decrease or loss. If these occur, seek medical attention immediately. Talk to your doctor about your medical conditions and your medications before taking Levitra®. Do not take Levitra® if you are allergic to its ingredients or if you are already taking nitrates (such as nitroglycerin), street drugs called “poppers” (such as amyl nitrate, amyl nitrite, butyl nitrate), or guanylate cyclase stimulators (such as riociguat). Levitra® is a drug that is used to treat erectile dysfunction (ED). It comes in four doses, 2.5 mg, 5 mg, 10 mg and 20 mg. The 10 mg dose is the most common starting dose, although some people may benefit from higher or lower doses. Levitra® is part of a “family” of medicines used to treat ED called phosphodiesterase-5 inhibitors (PDE5i). Other drugs in this family include Cialis (tadalafil), Viagra (sildenafil), and Stendra (avanafil). All of these drugs have the same mechanism of action, but there are subtle differences that may cause your doctor to recommend one drug out of the others based on your preferences and treatment goals. Levitra® is a short acting drug with an average half-life of 4–5 hours, which means that half the medicine is gone from the body after 4–5 hours in healthy people. The time that it takes to eliminate Levitra® may be prolonged in older people and people with liver or kidney disease meaning the drug may work longer in these people. Levitra® functions very similarly viagra pills for sale online to Viagra® with a few key differences. Levitra® comes in doses of 2.5 mg, 5 mg, 10 mg and 20 mg, while Viagra® comes in 25 mg, 50 mg, and 100 mg doses. The most common starting dose for Viagra® is 50 mg, and the most common dose for Levitra® is 10 mg. The use of Levitra® increases the likelihood of QT prolongation (a change seen on an EKG), which can sometimes be followed by irregular heartbeats. In rare cases, QT prolongation can cause dangerous abnormal heart rhythms that can even be fatal. Also, Levitra® does not cause the bluish visual tint sometimes caused by Viagra®. This is because unlike Viagra®, Levitra® does not inhibit PDE6, which is found in the retina and can cause visual color changes when blocked or inhibited. It’s also important to note that side effects are very individual, and someone who has side effects with one drug may not have them with the other. Talk to your doctor about the risks and possible side effects before you begin taking Levitra or Viagra. Some people think that higher is always better when it comes to ED viagra pills for sale online medication and may even take more than the highest FDA-approved dose of Levitra®, which is 20 mg. Levitra® has been studied in doses higher than 20 mg, including 40 mg twice daily. The reason the maximum FDA-approved dose of Levitra® is 20 mg is because above that dosage there is very little increase in benefit with a much higher risk of side effects. Even within the FDA-approved doses, there is only an additional response in about 5% of men when going from 10 mg to 20 mg.
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