After taking sildenafil, the active ingredient in Viagra, several physiological processes occur to help alleviate erectile dysfunction. Sildenafil works primarily by inhibiting an enzyme called phosphodiesterase type 5 (PDE5). This inhibition leads to an increased level of cyclic guanosine monophosphate (cGMP), a substance that relaxes smooth muscles and increases blood flow to certain areas of the body, including the penis.
About 30 to 60 minutes after ingestion, sildenafil begins to take effect, provided there is sexual stimulation. The increase in cGMP facilitates the relaxation of the blood vessels in the penis, allowing more blood to flow into the corpus cavernosum, which results in an erection. It is important to note that sildenafil does not cause an erection on its own; sexual arousal is necessary for it to work effectively.
The duration of sildenafil's effects can last for about 4 to 6 hours, during which the ability to achieve and maintain an erection is enhanced. The intensity and duration can vary depending on individual factors such as age, overall health, and other medications being taken.
Some common side effects may occur, including headaches, facial flushing, nasal congestion, indigestion, dizziness, and visual disturbances such as a blue tint to vision or increased light sensitivity. These side effects are usually mild and temporary but should be monitored.
In rare cases, more serious side effects can occur. These include sudden vision loss, hearing loss, or an erection lasting longer than 4 hours (priapism), which requires immediate medical attention to prevent long-term damage.
To ensure safe and effective use, it is crucial to follow the dosage and instructions provided by a healthcare provider. Taking sildenafil as prescribed minimizes the risk of adverse effects and interactions with other medications. Avoiding high-fat meals before taking the medication can also improve its effectiveness, as such meals can delay its absorption.
Overall, sildenafil can significantly improve erectile function and sexual performance when used responsibly under medical guidance. Regular check-ups and communication with a healthcare provider help manage any potential risks and maximize the benefits of the medication.