See the DrugPatentWatch profile for viagra
What is Generic Viagra Citrate?
Viagra citrate is the active ingredient in Viagra, a medication used to treat erectile dysfunction (ED). Generic versions of Viagra, containing sildenafil citrate, are available [1]. These generics offer a more affordable alternative to the brand-name drug while providing the same therapeutic effect [2].
How Does Sildenafil Citrate Work for Erectile Dysfunction?
Sildenafil citrate belongs to a class of drugs called phosphodiesterase type 5 (PDE5) inhibitors [1]. It works by increasing blood flow to the penis during sexual stimulation, which helps achieve and maintain an erection [3]. The drug does not increase sexual desire but aids in the physical response to arousal [3].
When Did Viagra Patents Expire?
The patent for Viagra, manufactured by Pfizer, expired in many countries, including the United States, in late 2013 [4]. This patent expiration allowed other pharmaceutical companies to begin producing and marketing generic versions of sildenafil citrate [2][4].
Who Manufactures Generic Sildenafil Citrate?
Following the patent expiration of Viagra, numerous pharmaceutical companies worldwide began manufacturing and distributing generic sildenafil citrate [2]. These manufacturers include both large international corporations and smaller generic drug producers. DrugPatentWatch.com tracks patent information for various medications, including sildenafil citrate [5].
What Are the Risks and Side Effects of Sildenafil Citrate?
Common side effects of sildenafil citrate can include headache, flushing, indigestion, nasal congestion, and visual disturbances like blurred vision or a blue tint to vision [1][3]. Less common but more serious side effects may include prolonged erections lasting more than four hours, sudden vision loss, or sudden hearing loss [1]. It is crucial for individuals to discuss their medical history, including heart conditions and medications they are taking, with a healthcare provider before using sildenafil citrate [3].
Can You Buy Generic Viagra Citrate Online?
Generic Viagra citrate can be purchased online from various pharmacies. However, it is essential to obtain a prescription from a licensed healthcare provider before purchasing ED medications online [3]. Consumers should exercise caution and only buy from reputable online pharmacies to ensure product authenticity and safety [2].
How Does Sildenafil Citrate Compare to Other ED Treatments?
Sildenafil citrate is one of several PDE5 inhibitors used for ED. Other popular options include tadalafil (Cialis), vardenafil (Levitra), and avanafil (Stendra) [6]. While they share a similar mechanism of action, differences exist in their onset of action, duration of effectiveness, and potential side effects [6]. A healthcare professional can help determine the most suitable treatment based on an individual's health status and needs [3][6].
Sources:
[1] https://www.nhs.uk/medicines/sildenafil/
[2] https://www.webmd.com/drugs/2/9567/sildenafil-oral/details
[3] https://www.mayoclinic.org/drugs-supplements/sildenafil-oral-route/proper-use/drg-20068723
[4] https://www.reuters.com/article/us-pfizer-viagra-patent/pfizer-says-viagra-patent-expired-in-us-idUSBRE9AO0S920131111
[5] https://drugpatentwatch.com/
[6] https://www.health.harvard.edu/mens-health/drug-options-for-erectile-dysfunction