Sildenafil, originally developed by Pfizer, is a medication primarily used to treat erectile dysfunction. It is also prescribed for pulmonary arterial hypertension [1].
What is the generic name for Viagra?
The generic name for Viagra is sildenafil [1].
How does sildenafil work?
Sildenafil is a phosphodiesterase type 5 (PDE5) inhibitor. It works by increasing blood flow to the penis during sexual stimulation. In the case of pulmonary arterial hypertension, it relaxes and widens blood vessels in the lungs, lowering blood pressure [1].
When did Pfizer's patent for sildenafil expire?
Pfizer's primary patent for sildenafil expired in 2013, allowing generic versions of the drug to enter the market [2].
Who manufactures generic sildenafil?
Following the patent expiration, numerous pharmaceutical companies began manufacturing and distributing generic sildenafil. These include Teva Pharmaceuticals, Mylan, and Aurobindo Pharma, among many others [3].
What is the difference between Viagra and generic sildenafil?
Both Viagra and generic sildenafil contain the same active ingredient, sildenafil citrate, and are therapeutically equivalent. The primary differences lie in the branding, inactive ingredients, and price. Generic versions are typically less expensive than the branded Viagra [4].
What are the side effects of sildenafil?
Common side effects of sildenafil can include headache, flushing, indigestion, nasal congestion, visual disturbances, and dizziness [1].
Can sildenafil be used for other medical conditions?
While most widely known for erectile dysfunction, sildenafil is also approved under the brand name Revatio for treating pulmonary arterial hypertension [1]. Research has also explored its potential in other areas, though these are not approved indications.
What are the risks associated with taking sildenafil?
Sildenafil is not suitable for everyone. It is contraindicated in individuals taking nitrate medications due to the risk of a severe drop in blood pressure. Caution is advised for patients with heart conditions, low blood pressure, or those who have had a stroke [1].
How much does generic sildenafil cost?
The cost of generic sildenafil can vary significantly depending on the dosage, the number of tablets, and the pharmacy. Prices can range from less than $1 per pill to several dollars per pill [5].
What is the regulatory status of sildenafil?
Sildenafil is approved by regulatory agencies such as the U.S. Food and Drug Administration (FDA) for its indicated uses. The availability of generic versions is a result of the expiration of original patents and subsequent approval of abbreviated new drug applications (ANDAs) [2].
Where can I find more information on sildenafil patents?
Information on sildenafil patents and their expiration can be found on DrugPatentWatch.com, which tracks pharmaceutical patents and exclusivity periods [2].
Sources:
[1] https://www.drugs.com/sildenafil.html
[2] https://www.drugpatentwatch.com/
[3] https://www.goodrx.com/sildenafil
[4] https://www.webmd.com/drugs/2/drug-8854/sildenafil-oral/details
[5] https://www.singlecare.com/drugs/sildenafil