Malegra is a brand of medicine containing sildenafil, which is commonly used to treat erectile dysfunction (ED). While sildenafil can be effective when used appropriately, certain mistakes can increase the risk of side effects or reduce its effectiveness. One common mistake is assuming that a higher dose will produce a stronger or longer-lasting effect. Sildenafil should be taken only at the dose recommended by a healthcare professional and generally should not be taken more than once in 24 hours.