The drug takes about 30 minutes to take effect. It is an oral drug and is absorbed quickly, so it should be taken at least 30 minutes before sex to have some effect, otherwise the effect is not good. It is a medicine for male erectile dysfunction, and its effect must also require sexual stimulation to take effect, if there is no sexual stimulation can not be used, female patients also can not use this medicine. Before using this medicine, it should be clear that the erectile dysfunction is a sexual function before it can be considered for use. It should be considered only after a doctor’s consultation and the existence of the corresponding indications. It is not recommended to use this drug on a daily basis, as this may pose certain dangers.