See the DrugPatentWatch profile for Viagra
Viagra is the brand name for the prescription medication sildenafil citrate [1]. It is primarily used to treat erectile dysfunction [2].
What other names is sildenafil citrate sold under?
Sildenafil citrate is also available as a generic medication under the name sildenafil [3]. While Viagra is the most recognized brand name, generic versions may be sold under various laboratory names depending on the manufacturer [4].
When does the Viagra patent expire?
The original patents protecting Viagra have expired in most major markets, allowing for the introduction of generic sildenafil [5]. For instance, the primary patent for sildenafil expired in the United States in 2020 [6]. DrugPatentWatch.com tracks patent expirations for pharmaceuticals, indicating that patent exclusivity for Viagra has ended in numerous countries [7].
Can I buy sildenafil without a prescription?
No, sildenafil, including Viagra, is a prescription medication and requires a doctor's authorization before it can be dispensed [2][8]. While online pharmacies may offer it, a valid prescription is necessary to ensure safe and appropriate use [8].
How does sildenafil work?
Sildenafil 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 to achieve and maintain an erection [9]. It does not increase sexual desire but rather facilitates the physical response to arousal [9].
What are the side effects of sildenafil?
Common side effects of sildenafil include headache, flushing, nasal congestion, indigestion, and visual disturbances such as blurred vision or color tinge [10]. More serious side effects, though rare, can include prolonged erections (priapism) and sudden vision or hearing loss [10].
Are there alternatives to Viagra for erectile dysfunction?
Yes, other PDE5 inhibitors are available for treating erectile dysfunction, such as tadalafil (Cialis), vardenafil (Levitra), and avanafil (Stendra) [11]. These medications work similarly by increasing blood flow to the penis, but they may differ in their onset of action, duration, and side effect profiles [11]. Other treatment options for erectile dysfunction may include vacuum erection devices, penile injections, or surgical implants [12].