They normal erection shorten the refractory period and result in firmer erections, making them an appealing option for those looking to boost sexual performance. Using Viagra without a prescription to boost sexual performance is not the same as using Viagra as intended. Abusing Generic Tadalafil not only increases the risk of psychological dependence, but it can also increase the risk of other common side effects, such as headaches, nasal congestion, vision issues and digestive problems. Used as recommended, Viagra is a safe, effective and reliable medication that is neither physically nor symptoms addictive. You can also:.