Manforce 100 mg works by blocking the enzyme Phosphodiesterase type 5 (PDE5). This enzyme normally restricts blood flow in the penis. When it is inhibited, the smooth muscles in blood vessels relax, allowing increased blood flow during sexual stimulation. Common side effects include headache, flushing, dizziness, nasal congestion, and mild stomach discomfort. It should not be used with nitrate medications or certain heart drugs, as this can cause a dangerous drop in blood pressure. Alcohol may also reduce effectiveness and increase side effects. https://www.genericday.com/manforce-100-mg.html