Common side effects include headaches, flushing, indigestion, sildenafil 20 mg tablet price nasal congestion, and impaired vision. Therefore, it is recommended that Viagra be used under the guidance of a healthcare provider. More severe risks, though rare, include priapism (a painful erection lasting longer than four hours), sudden hearing loss, and myocardial infarction (heart attack). Despite its success and widespread use, viagra keep you hard after ejaculation Viagra is not without side effects and potential risks.  
  
In conclusion, Viagra remains a pivotal treatment for erectile dysfunction with a well-established efficacy and safety profile. Its development and subsequent popularity have not only provided therapeutic benefits to millions of men worldwide but have also paved the way for greater openness in discussing and addressing sexual health issues. Originally intended as a treatment for hypertension and angina pectoris, its notable side effect on erectile dysfunction (ED) redirected its course towards sexual health, marking a revolutionary step in its domain.  
  
Viagra, chemically known as sildenafil citrate, was first developed by scientists in Britain working for Pfizer in 1989. The introduction and success of Viagra have also had significant social and cultural impacts. It has helped reduce the stigma associated with erectile dysfunction, providing men a means to discuss and manage this condition more openly. However, it has also faced criticism and concerns over recreational use and its portrayal in media and advertising, which sometimes promotes unrealistic expectations about sexual performance.  
  
Erectile dysfunction is a condition where a man is unable to achieve or maintain an erection adequate for satisfactory sexual performance. The prevalence of ED increases with age and can be influenced by a variety of factors including psychological issues, health conditions like diabetes and heart disease, and certain medications. The active ingredient in Viagra, sildenafil, belongs to a class of drugs known as phosphodiesterase type 5 (PDE5) inhibitors.  
  
The mechanism of action for Viagra involves the blocking of the PDE5 enzyme, which is predominantly found in the penis. Under normal conditions, upon sexual arousal, nitric oxide is released into the corpus cavernosum, part of the penis structure. This nitric oxide stimulates the production of cyclic guanosine monophosphate (cGMP), a molecule that causes the smooth muscles in the penis to relax. This relaxation allows for increased blood flow into the penile tissues, leading to an erection.  
  
Its effects can last for up to four hours, providing ample time for satisfactory sexual intercourse. The recommended starting dose is 50 mg, but this can be adjusted based on efficacy and tolerability. Viagra is typically taken orally, in the form of a pill, approximately 30 minutes to an hour before sexual activity. It's crucial for users to follow medical advice strictly and viagra peak time avoid exceeding the prescribed dosage to prevent adverse effects.  
  
Viagra, chemically known as sildenafil citrate, is a medication primarily used to treat erectile dysfunction (ED) in men. Since its accidental discovery and subsequent release by Pfizer in 1998, Viagra has become one of the most well-known and frequently prescribed drugs in the world for enhancing sexual function.