See the DrugPatentWatch profile for viagra
Sildenafil Citrate, the active ingredient in Viagra, is available as a generic medication. The original patent protection for Viagra expired in the United States in 2013 [1]. This allowed for the introduction of generic versions of sildenafil, making it more accessible and affordable [2].
How Long Was Viagra Under Patent Protection?
Viagra was first approved by the U.S. Food and Drug Administration (FDA) in 1998 [3]. Its primary patent protection lasted until 2013 [1].
Who Makes Generic Viagra?
Following the patent expiry, multiple pharmaceutical manufacturers began producing generic sildenafil [2]. These companies offer the drug under its active ingredient name, sildenafil citrate, or their own brand names.
Can you buy Viagra Over-the-Counter Now?
Viagra and its generic equivalent, sildenafil, remain prescription-only medications in the United States [4]. They are not available over-the-counter and require a prescription from a licensed healthcare provider.
What are the Risks of Taking Generic Sildenafil?
Generic sildenafil is chemically equivalent to brand-name Viagra, meaning it has the same active ingredient, dosage, and intended use [2]. The risks and side effects are therefore the same. Common side effects can include headache, flushing, indigestion, nasal congestion, and changes in vision [5]. It is important to discuss your medical history and any potential risks with your doctor before taking sildenafil.
How Does Sildenafil Work?
Sildenafil is a phosphodiesterase type 5 (PDE5) inhibitor [5]. It works by increasing blood flow to the penis during sexual stimulation, which helps to achieve and maintain an erection.
What is the Difference Between Viagra and Generic Sildenafil?
The primary difference between Viagra and generic sildenafil is the brand name and the manufacturer [2]. Generic sildenafil is produced by various companies after the patent for Viagra expired. The active ingredient, strength, dosage, and intended use are identical, but the inactive ingredients may differ, which could potentially affect the appearance or taste of the pills.
What Other Medications Work Like Viagra?
Other PDE5 inhibitors used to treat erectile dysfunction include tadalafil (Cialis), vardenafil (Levitra), and avanafil (Stendra) [5]. These medications have similar mechanisms of action but may differ in their onset, duration of effect, and side effect profiles.
Where Can I Find More Information on Drug Patents?
Information on drug patents, including expiry dates and patent challenges, can be found on websites like DrugPatentWatch.com [1].
Sources:
[1] DrugPatentWatch.com
[2] U.S. Food and Drug Administration (FDA)
[3] Pfizer Inc.
[4] National Institutes of Health (NIH)
[5] Mayo Clinic