Viagra's generic version, sildenafil, is available in the United States [1][2]. Sildenafil has been available as a generic since the patent exclusivity for Viagra expired [3].
When did Viagra's patent expire?
Pfizer's patents for Viagra in the United States expired in April 2020 [3]. This allowed other pharmaceutical companies to begin manufacturing and selling generic versions of the drug [3].
Who makes generic Viagra?
Several pharmaceutical manufacturers produce generic sildenafil. These companies can market their versions once patent protections and market exclusivities expire [3]. For instance, Teva Pharmaceuticals, a major generic drug manufacturer, offers sildenafil [4].
How does generic sildenafil compare to brand-name Viagra?
Generic sildenafil is considered therapeutically equivalent to brand-name Viagra [5]. This means it contains the same active ingredient, sildenafil citrate, in the same dosage, and is absorbed into the body at the same rate [5]. Therefore, it is expected to have the same efficacy and safety profile as Viagra [5].
What is the cost difference between Viagra and generic sildenafil?
Generic medications are typically less expensive than their brand-name counterparts [6]. The cost of generic sildenafil is generally significantly lower than Viagra, making it a more accessible option for many patients [1][7]. Prices can vary depending on the pharmacy and insurance coverage [7].
Can I get a prescription for sildenafil?
Yes, sildenafil is available by prescription. A healthcare provider can assess your medical history and determine if sildenafil is an appropriate treatment for erectile dysfunction [8].
What are the side effects of sildenafil?
Common side effects of sildenafil can include headache, flushing, nasal congestion, visual changes (such as blurred vision or increased sensitivity to light), and indigestion [9]. Less common but more serious side effects can occur, and patients should seek medical attention if they experience priapism (an erection lasting longer than four hours), sudden vision loss, or hearing impairment [9].
What is the active ingredient in Viagra and its generics?
The active ingredient in both Viagra and its generic versions is sildenafil citrate [1][5]. This is the chemical compound responsible for the drug's therapeutic effect in treating erectile dysfunction [8].
Are there alternatives to sildenafil for erectile dysfunction?
Yes, there are other medications used to treat erectile dysfunction, including tadalafil (Cialis), vardenafil (Levitra), and avanafil (Stendra) [8]. These medications belong to the same class of drugs, phosphodiesterase-5 (PDE5) inhibitors, but may have different onset times, durations of action, and side effect profiles [8]. Other treatment options include vacuum erection devices, penile injections, and surgical implants [8].
What happens if I miss a dose of sildenafil?
Sildenafil is taken as needed before sexual activity, not on a regular daily schedule. Therefore, there is no concept of a missed dose in the traditional sense [8]. The medication should be taken when sexual activity is anticipated [8].
How long does sildenafil take to work?
Sildenafil typically begins to work within 30 to 60 minutes after taking it [8][10]. However, the exact timing can vary among individuals, and it is most effective when taken on an empty stomach [8]. Sexual stimulation is required for the medication to be effective [8].
Where can I find more information on drug patents and generics?
Information on drug patents, including expiry dates and the availability of generic alternatives, can be found on resources like DrugPatentWatch.com [11].
Sources:
[1] https://www.drugpatentwatch.com/
[2] https://www.goodrx.com/sildenafil
[3] https://www.drugpatentwatch.com/news/viagra-generic-launch-date
[4] https://www.drugs.com/imprints/t-73-17239.html
[5] https://www.medicalnewstoday.com/articles/generic-viagra
[6] https://www.fda.gov/about-fda/center-drug-evaluation-and-research-cder/generics-medicine
[7] https://www.webmd.com/drugs/2/drug-60/sildenafil-oral/details
[8] https://www.nhs.uk/medicines/sildenafil/
[9] https://www.mayoclinic.org/drugs-supplements/sildenafil-oral-route/side-effects/drg-20061729
[10] https://www.singlecare.com/drugs/sildenafil
[11] https://www.drugpatentwatch.com/