Viagra is the trade name of sildenafil citrate, and 必利勁 is the trade name of dapoxetine hydrochloride tablets, usually these two drugs can be taken at the same time, and the combination of drugs is usually erectile dysfunction combined with premature ejaculation, but under the guidance of the doctor. Sildenafil citrate belongs to type 5 phosphodiesterase selective inhibitors, mainly for the treatment of erectile dysfunction, and dapoxetine hydrochloride tablets belong to selective 5-hydroxytryptamine reuptake inhibitors, mainly for the treatment of premature ejaculation, poor ejaculatory control and other diseases. Usually there is no chemical reaction between the two drugs, and it is usually possible to take them at the same time under the guidance of a doctor. However, it should be noted that women, children and people who are allergic to the ingredients of Sildenafil Citrate and Dapoxetine Hydrochloride Tablets are prohibited from using the drug. All in all, patients must follow the doctor’s instructions for the joint use of drugs, do not self-medication, so as not to delay the condition.