Viagra, or sildenafil, primarily works by inhibiting an enzyme called phosphodiesterase-5 (PDE5). This allows increased blood flow to the penis, facilitating an erection. This mechanism is specific to the erectile tissue and doesn’t significantly impact other areas of the body.
Common Side Effects
While generally safe, Viagra can cause side effects. Headaches are frequent, occurring in about 15% of users. Facial flushing and nasal congestion are also common, affecting around 10% each. Less frequent, but still possible, are visual disturbances, such as changes in color perception or blurred vision. Digestive upset, including nausea and diarrhea, is another potential side effect. Importantly, these side effects are usually mild and temporary. Consult your doctor if they persist or are severe.
Rare but Serious Side Effects
Rarely, Viagra can cause more serious side effects, including sudden hearing loss, heart attack, stroke, or irregular heartbeat. These risks are increased in individuals with pre-existing heart conditions or high blood pressure. Men experiencing chest pain, dizziness, or prolonged erection (priapism) should seek immediate medical attention. This information should not substitute for a medical consultation; discuss any concerns with your physician before using Viagra.
