Other side effects may include headaches, flushing, indigestion, nasal congestion, dizziness, and visual disturbances. These side effects are generally mild and temporary but can be severe in rare cases. The use of Viagra is contraindicated in patients taking nitrates (often prescribed for chest pain), as the combination can cause a dangerous decrease in blood pressure. viagra online price, 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. By blocking PDE5, Viagra enhances the effects of NO by prolonging the duration and effect of cGMP, thus improving the ability to achieve and maintain an erection in the presence of sexual stimulation. Viagra works by inhibiting an enzyme known as phosphodiesterase type 5 (PDE5), which is responsible for the breakdown of cGMP in the corpus cavernosum.

Furthermore, ongoing research is investigating the potential of Viagra in other areas, such as its effects on heart function, diabetes-related complications, and even certain types of cancer, demonstrating the broad therapeutic potential of this medication beyond its initial indication. Therefore, Viagra must be used under appropriate medical supervision. Despite its success, Viagra is not devoid of side effects. The most common adverse effects include headaches, flushing, dyspepsia, nasal congestion, and impaired vision.

More serious but rare side effects include priapism, a condition where an erection lasts longer than four hours and can cause permanent damage to the penis. It has helped to reduce the stigma associated with ED, encouraged men to seek medical advice for their sexual health issues, and spurred the development of other ED treatments and sexual health products. The cultural impact of Viagra has been significant, changing the landscape of sexual health and relationships for many.

However, Viagra is contraindicated in certain groups of patients, particularly those taking nitrates for chest pain, as the combination can lead to a dangerous drop in blood pressure. Despite its success, Viagra is not without side effects. The most common adverse effects include headaches, flushing, indigestion, nasal congestion, and dizziness. These side effects are generally mild to moderate and transient. 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. In PAH, Viagra helps relax blood vessels in the lungs, improving blood flow and reducing the heart's workload. For instance, it has shown potential benefits in treating pulmonary arterial hypertension (PAH), a rare but serious heart condition. Beyond its primary use in treating ED, Viagra has also been explored for other medical conditions.

It is marketed under the brand doxycycline online uk name Revatio for this purpose. However, it is important to note that Viagra does not lead to an erection without sexual stimulation; it merely facilitates the process when the conditions are right. Viagra is administered orally, typically in dosages ranging from 25 mg to 100 mg.