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a b Amerman D (22 May 2012). "Counterfeit Viagra, Cialis, Levitra: The Ultimate Guide". AccessRx . Retrieved 10 January 2017. Viagra contains the drug sildenafil, while Levitra contains the drug vardenafil. Both Viagra and Levitra belong to a class of drugs called phosphodiesterase type 5 (PDE5) inhibitors. (A class of drugs is a group of medications that work in a similar way.) Uses Gordon S (11 December 2017). "Generic Viagra: Two versions of sildenafil hit the market today". CBS News . Retrieved 24 November 2018. Viagra is approved to treat erectile dysfunction (ED) in males. With ED, you have trouble getting and keeping an erection that’s firm enough to allow you to have sex.

Pfizer's patents on Viagra expired outside the US in 2012; in the US they were set to expire, but Pfizer settled litigation with each of Mylan and Teva which agreed that both companies could introduce generics in the US on 11 December 2017. [76] [77] In December 2017, Pfizer released its own generic version of Viagra. [78] [79] Chandna H (7 August 2018). "Pfizer to lose patent of drug Viagra, Indian companies gear up with copycat versions: Pfizer's patent for the formulation of Viagra, used to treat impotence in men, ends in the US in 2020". Hindustan Times. New Delhi . Retrieved 10 August 2018. The following list contains examples of serious side effects that can occur with either Viagra or Cialis.Pfizer Synthesis Facility, Ringaskiddy, Ireland - Pharmaceutical Technology". www.pharmaceutical-technology.com . Retrieved 10 April 2021. No, Viagra doesn’t directly increase your sex drive. And it doesn’t make you sexually aroused. However, some people find that if Viagra works to treat their erectile problem, it also increases their sexual confidence. And this may lead to an increased sex drive. How can I tell if Viagra’s not working? Vardenafil usually works for 4 to 5 hours. Its effects might last longer if you have mild to moderate ED. A newer form of the medicine that dissolves on the tongue might work faster than the pill that you swallow. The use of Viagra and Cialis in treating ED has been directly compared in several clinical studies. One review of these studies found the two drugs were similarly effective in improving the ability of males to have and maintain erections.

Even though Viagra keeps working in your body for several hours, your erection shouldn’t last this long. In fact, rarely, Viagra can cause priapism. With this condition, you have a long-lasting and sometimes painful erection. Professional athletes have been documented using sildenafil, believing the opening of their blood vessels will enrich their muscles. In turn, they believe it will enhance their performances. [39] [40] Analogs Scientist who developed Viagra receives knighthood in New Year's Honours". The Pharmaceutical Journal. Royal Pharmaceutical Society. 2014. doi: 10.1211/pj.2014.20067494. ISSN 2053-6186. a b c Roustit M, Blaise S, Allanore Y, Carpentier PH, Caglayan E, Cracowski JL (October 2013). "Phosphodiesterase-5 inhibitors for the treatment of secondary Raynaud's phenomenon: systematic review and meta-analysis of randomised trials". Annals of the Rheumatic Diseases. 72 (10): 1696–9. doi: 10.1136/annrheumdis-2012-202836. PMID 23426043. S2CID 33666968. PDE-5 inhibitors appear to have significant but moderate efficacy in secondary [Raynaud's phenomenon].non-arteritic anterior ischemic optic neuropathy (NAION), which is an eye condition that causes damage to your optic nerve Tentative evidence suggests that sildenafil may help males who experience antidepressant-induced erectile dysfunction. [20] Pulmonary hypertension Edwards J (21 October 2009). "What Will Happen When Viagra Goes Generic?". AccessRx.com. Archived from the original on 23 April 2011 . Retrieved 25 March 2011. It might. But even if your erection goes away after you’ve ejaculated, Viagra can help you to get another erection up to 4 hours after you’ve taken a dose. Can I take Viagra by snorting it?

But keep in mind that a sudden drop in your blood pressure could be dangerous if you have certain heart conditions. Sudden low blood pressure may also be dangerous if you’re taking certain other medications.

Viagra works to treat ED by helping you have and maintain an erection. The drug does this by improving blood flow into your penis when you’re sexually aroused. Viagra 25mg film-coated tablets - Summary of Product Characteristics (SmPC)". (emc). 7 August 2020 . Retrieved 6 October 2020. You won't be able to buy over the counter Viagra connect if you're taking any of the following medicines, because they can increase the level of sildenafil in your blood and so increase the risk of getting side effects. Your doctor may prescribe you a lower Viagra dose if you're taking any of these: The 2007 Ig Nobel Prize Winners". Improbable Research. 4 October 2007. Archived from the original on 26 January 2013 . Retrieved 10 February 2009.

As with most drugs, some people can have an allergic reaction after taking Viagra. In clinical studies, less than 2% of people who took Viagra had an allergic reaction. It’s not known how often allergic reactions occurred in people who took a placebo (no active drug). Note: Sex and gender exist on spectrums. Use of the term “male” in this article refers to sex assigned at birth. Does Viagra work to treat ED? However, if you have high blood pressure that’s controlled with medication and you also don’t have a heart condition, it’s usually fine to take Viagra. Just be aware that taking the drug could lower your blood pressure.. On 8 November 2012, the Supreme Court of Canada ruled that Pfizer's patent 2,163,446 on Viagra was invalid from the beginning because the company did not provide full disclosure in its application. The decision, Teva Canada Ltd. v. Pfizer Canada Inc., pointed to section 27(3)(b) of The Patent Act which requires that disclosure must include sufficient information "to enable any person skilled in the art or science to which it pertains" to produce it. It added further: "As a matter of policy and sound statutory interpretation, patentees cannot be allowed to 'game' the system in this way. This, in my view, is the key issue in this appeal." [89] Ciment J (November 1999). "Health situation in former communist bloc is dire, says Unicef". BMJ. 319 (7221): 1324. doi: 10.1136/bmj.319.7221.1324g. PMC 1174637. PMID 10567131.You should also avoid products you can buy online without a prescription that claim either to be generic forms of sildenafil or to contain sildenafil. (Sildenafil is the active drug in Viagra.)