Generic tadalafil 20mg is an effective medication used to treat erectile dysfunction (ED). It contains tadalafil, a phosphodiesterase type 5 (PDE5) inhibitor that enhances blood flow to the penis, facilitating a firm and lasting erection when sexually aroused. Vidalista is known for its long-lasting effects, which can last up to 36 hours, earning it the nickname "The Weekend Pill." It is taken orally, usually about 30 minutes before sexual activity. Common side effects include headaches, dizziness, and upset stomach, but these are generally mild. Always consult a healthcare provider for personalized advice and to ensure it's appropriate for your condition.