How long it takes for sildenafil to harden is related to the individual’s physical condition as well as the ability to absorb the drug, and it usually takes effect in half an hour to an hour.
Sildenafil can stretch the smooth muscle of the corpus cavernosum, increase the blood flow of the corpus cavernosum to improve the hardness of the erection, but sildenafil needs to have a certain amount of sexual stimulation to be able to play a role. Young people are in better shape, the drug is absorbed quickly, usually about half an hour will take effect. If you are older or if the sexual stimulation is not strong enough, it may take longer, about an hour or so to work.
Sildenafil is a prescription drug that has some side effects that can cause patients to have headaches, nausea, and flushing. The drug is prohibited in combination with nitrates, and it is contraindicated for women, those who are allergic to the product, children, and those whose recent cardiovascular status makes sexual intercourse inadvisable.
If you need to use the drug, you need to take it under the supervision of a doctor.