Viagra must be taken precisely as it was prescribed by a certified doctor or doctor. 시알리스 효과 Never take it in larger doses or for a longer duration than what the doctor recommends. Consumption of Viagra differs according to a person’s present erectile dysfunction problem. Furthermore, keep in mind that Viagra works just when there is sex-related excitement. This suggests that erection is not feasible by just simple consumption of the Viagra pill. Do not expect an erection if there is no physical excitement.