Tadalafil is present in the Vidalista pills. More people refer to it as the "effective pill." It is a medication that works well for treating male erectile dysfunction (ED). A guy with erectile dysfunction is unable to get and/or sustain an erection strong enough for sexual activity. Tadalafil is the dangerous ingredient in this medication. This medication has a 36-hour half-life, so avoid taking it too often. Follow your doctor's advice when taking this medication. This medication can be taken with water, but avoid breaking or chewing the tablet. This medication can be used either before or after a meal.