Vidalista and Tadalafil for Erectile Dysfunction Vidalista is a tadalafil-based medicine marketed for erectile dysfunction (ED). Tadalafil supports increased blood flow to the penis during sexual stimulation and may begin working within around 30–60 minutes. One feature of tadalafil is its longer treatment window, with effects potentially remaining available for up to 36 hours in some people. This does not mean an erection lasts continuously for this period. Different strengths are marketed, including Vidalista 20 mg , Vidalista 40 mg and Vidalista 60 mg . A higher strength does not automatically provide faster or better results and may increase the likelihood of side effects. Common tadalafil side effects include headache, flushing, indigestion and back pain. Tadalafil should not be combined with nitrate medicines because this can cause a dangerous drop in blood pressure. Medical advice is recommended when choosing an appropriate tadalafil dose.