The most common medications used to treat erectile dysfunction (ED) are Viagra, Cialis, Sildenafil, and Levitra. They belong to a class of drugs called phosphodiesterase 5 inhibitors (PDE5 inhibitors), which will be explained below. An erection occurs when someone is stimulated by an erotic thought or sexual contact. That leads to a series of chemical reactions in the blood vessels of the penis that results in 6 times the blood flow getting trapped in the penis. An erection might last indefinitely if it weren’t for chemicals called phosphodiesterases. They work at reversing the process that keeps the penis erect. Usually there is a balance between the chemicals that cause an erection and those that would return the penis to being flaccid. They pull in opposite directions with one dominating over the other in a perfect sequence that lets a man have an erection as long as it is needed. I am often asked which is the best of the three most common erectile dysfunction treatments: Viagra, Levitra or Cialis. Viagra is the most well-known of the three as it has been around for over 15 years. There is no simple answer to this question, as some men find one treatment works better for them than the others. This means that a lot is known about its effects and side effects. It works within an hour of taking a tablet, and is best taken on an empty stomach. The effects of Viagra will last for four to six hours. Viagra was developed and originally marketed by the pharmaceutical company Pfizer, and until 2013 Pfizer was the only company allowed to sell it. When Pfizer’s patent on Viagra expired, the market was open for other companies to produce the medicine, albeit under its generic name Sildenafil, rather than the brand name Viagra. Sildenafil contains exactly the same active ingredient as Viagra (sildenafil citrate), and works in the same way. 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S., be aware that, in most circumstances, it is technically not legal for individuals to import prescription drugs; however, U. government officials have stated that individuals who order non-controlled prescription drugs from Canada or other foreign sources (up to a three-month supply) for their own use are not being pursued or prosecuted. Pharmacies listing prices on Pharmacy are required to follow Pharmacy Checker Verification Program standards and guidance policies, which permit pharmacies to internationally market, sell, process and/or dispense a maximum 3-month supply of non-controlled medication pursuant to a valid prescription authorizing a 3-month supply quantity. states, it's commonplace to dispense a year supply of a non-controlled medication; however, the quantity dispensed of Levitra is often limited by U. health insurance policies to 6 tablets every 30 days. In other words, your doctor may only prescribe 3 months at a time if you want to order through international online pharmacies. S., pharmacies have more latitude to market and sell larger quantities of medication to their customers domestically, in accordance with a written prescription. Your doctor may be able to prescribe a year supply, but, unless you are paying in cash, health insurance coverage usually does not cover a quantity that large. Levitra (vardenafil) is a prescription medication used to treat erectile dysfunction in men. Unfortunately, the cost for this brand-name drug only continues to rise in the U. where just one pill of Levitra 20 mg costs around $60. Perhaps you can return back to the site's homepage and see if you can find what you are looking for. Or, you can try finding it by using the search form below. 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A Q How many generic Levitra pills can my doctor prescribe at one. a maximum 3-month supply of non-controlled medication pursuant to a.