Sildenafil is a prescription class western drug and does not work to delay or treat premature ejaculation. It is a medicine for the treatment of erectile dysfunction in men. In fact, for most patients, it can be taken about an hour before sexual activity under the recommended dose of the doctor, and it should be more flexible in the time of taking it, for example, any time between 0.5 and 4 hours before sexual activity. Since this drug is a drug for erectile dysfunction, some men in life use this drug as a sexual enhancement drug. In a way, it is not reasonable if it is applied for a long time, because sildenafil improperly and inappropriately applied can cause adverse reactions, such as cardiovascular events can occur. If it leads to prolonged erection, it can cause related symptoms, so it needs to be noted that it is a medicine will have some adverse effects. If it is a sexual dysfunction, it is okay to take it according to the doctor’s requirements. If you want to prolong and enhance the sexual function on your own, it is still recommended to take it with caution.