Viagra it is a medication for treating erectile dysfunction in men and can be taken if there is erectile dysfunction. If the erectile function is normal, this situation is not recommended to take Viagra. For Viagra, it has indications for treatment and relative contraindications. For those who have erectile dysfunction and also have high blood pressure and are taking nitrates, in this case taking Viagra must be careful, it may cause severe hypotension to occur. For patients with erectile dysfunction, after excluding other contraindications, you can take Viagra, it is recommended to take it orally one hour before sexual intercourse, and then there is sexual stimulation, so that the penile erection can be improved, so that normal sexual behavior can be completed.