Viagra (sildenafil) and Levitra (vardenafil) are prescription medications used to treat erectile dysfunction and pulmonary arterial hypertension. Viagra was introduced by Pfizer Pharmaceuticals in March 1998 as a treatment for pulmonary arterial hypertension. The clinical trials revealed that the active ingredient — generically known as sildenafil citrate — also relaxed the muscle tissues in the penis, allowing for increased blood flow. Levitra, introduced in 2003 by Bayer Pharmaceuticals and marketed by Glaxo Smith Kline to treat erectile dysfunction, works similarly. In appearance, Viagra tablets are blue, rounded diamonds that are available in 25 mg, 50 mg, and 100 mg doses. Levitra has orange-colored tablets in 2.5 mg, 5 mg, 10 mg, and 20 mg doses. It is recommended that both medications be taken 30 to 60 minutes before sexual activity is intended. A generic version of Levitra has been approved by the FDA. However, this does not mean that the product will necessarily be commercially available - possibly because of drug patents and/or drug exclusivity. The following products are equivalent to Levitra and have been approved by the FDA: Note: Fraudulent online pharmacies may attempt to sell an illegal generic version of Levitra. These medications may be counterfeit and potentially unsafe. Patent and Trademark Office at any time during a drug's development and may include a wide range of claims. If you purchase medications online, be sure you are buying from a reputable and valid online pharmacy. Ask your health care provider for advice if you are unsure about the online purchase of any medication. Does doxycycline treat chlamydia Xenical before and after pictures Amoxicillin directions Structurally vardenafil Levitra is similar to sildenafil, while tadalafil Cialis is very different. Vardenafil Levitra is almost 10 times more biochemically potent. Препарат для повышения потенции Levitra Equivalent - это усовершенствованный вариант Виагры, который воздействует на мужчину не только одноразово, с целью получить. Generic Levitra Vardenafil Levitra Equivalent LocalPharmacy Prices for Generic Viagra Online! Best prices on Levitra from licensed, top-rated pharmacies in the U. S. Canada, and internationally. Buy Generic Cialis Online. Consider 5-mg starting dose for patients age 65 and older. Overview of phosphodiesterase 5 inhibition in erectile dysfunction. Maximum recommended dose is 20 mg; maximum dosing frequency is once per day. Efficacy and tolerability of vardenafil in men with erectile dysfunction following radical prostatectomy. Erectile dysfunction: comparison of efficacy and side effects of the PDE-5 inhibitors sildenafil, vardenafil and tadalafil—review of the literature. Dosing recommendations: Start at 10 mg about 1 hour before sexual activity. Efficacy and safety of tadalafil for the treatment of erectile dysfunction: results of integrated analyses. However, studies of time to onset of erection indicate that about one-third of patients using the maximum recommended doses of any of these agents will experience onset within 14 to 16 minutes. Effects of tadalafil on erectile dysfunction in men with diabetes. By contrast, tadalafil reaches maximum concentration within 30 minutes to 6 hours (median 2 hours). Efficacy and tolerability of tadalafil, a novel phosphodiesterase 5 inhibitor, in treatment of erectile dysfunction. Vardenafil and sildenafil reach maximum plasma concentration within 30 minutes to 2 hours (median 1 hour for sildenafil and 0.7 hour for vardenafil). Management of sexual dysfunction in patients with cardiovascular disease: recommendations of the Princeton Consensus Panel. A lower starting dosage is required with vardenafil than with sildenafil because of the former agent’s greater in vitro and in vivo potency, but whether this results in greater clinical efficacy or tolerability is unknown. As mentioned by marvell, there is no genric levitra available yet. Be aware that there are a number of companies currently offering generic Levitra online but these are most likely fake and potentially dangerous. Also, there often is some confusion between the generic version of a drug and the generic name. Every brand name has an active ingredient which is called the "generic name". For levitra this is vardenafil and is not the same as a "generic version" of a drug. In order for there to be a generic version, the brand name must have gone off-patent and another company besides the original patent holder must be making the drug. As already stated, in the United States there is no generic form of Levitra. 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The active ingredient of levitra is verdanafil and there are other drugs which have the same active.