Introduction to Viagra and Sildenafil

Viagra, also known by its active ingredient sildenafil, is commonly known for its use in treating erectile dysfunction. Sildenafil works by increasing blood flow to the penis to aid in erection. However, it does not just influence blood flow in the penile region; it can also impact other parts of the body, leading to various side effects.

Common Side Effects of Viagra

Common side effects of Viagra include headaches, skin flushing, upset stomach, a stuffy nose, and nosebleeds. A majority of these side effects, such as skin flushing and headaches, are due to the dilation of blood vessels throughout the body, a direct result of sildenafil's action.

Less Common Side Effects: Rectal Bleeding and Blood in Stool

Rectal bleeding and blood in stool have been documented as less common side effects of Viagra, especially among males aged 30-39. The exact pathogenic mechanism causing this side effect could lie in sildenafil's vasodilator effects. Viagra's action on dilating blood vessels, combined with its impact on various phosphodiesterase receptors, leads to increased circulation, potentially resulting in such side effects.

Other Serious Side Effects of Viagra

Aside from rectal bleeding, other serious side effects can occur with Viagra use. Low blood pressure and abnormal ejaculation are some of these serious side effects. Furthermore, there is a risk of priapism, a condition where a painful erection lasts longer than expected. This condition can be a severe issue, potentially causing permanent damage if not treated immediately.

The Role of Preexisting Medical Conditions and Medication Interactions

It is important to be aware that individuals with certain preexisting medical conditions or those taking certain medications may experience increased side effects or interactions. For instance, sildenafil is associated with bleeding events, so individuals with bleeding problems should be prescribed Viagra with caution.

Importance of Medical Attention and Proper Use of Viagra

Given these side effects, it's crucial to use Viagra exactly as directed by a doctor and to inform them of any preexisting medical conditions or medications being taken to avoid potential interactions or adverse effects. Should any side effect, including rectal bleeding or blood in stool, occur, it is imperative to seek immediate medical attention.

Summary and Conclusion

In conclusion, while Viagra is most commonly associated with the treatment of erectile dysfunction, potential side effects, including rectal bleeding and blood in stool, can occur.

These are less common but are serious nonetheless.

Therefore, it is critical to take Viagra responsibly, under a doctor's guidance, and to seek medical attention if any side effects occur.