The generic name for 必利勁 is Dapoxetine Hydrochloride Tablets and the generic name for Cialis is Tadalafil Tablets. The two should not be taken together. Dapoxetine hydrochloride tablets and tadalafil tablets are both medications used to treat abnormal sexual function in men. Dapoxetine hydrochloride tablets are mainly used to treat premature ejaculation and tadalafil tablets are mainly used to treat erectile dysfunction. They treat different diseases, and both are western medicines, taking them together has more side effects and may cause headache and indigestion, so try not to take them together. Dapoxetine hydrochloride tablets need to be taken about 1 to 3 hours before sex, and tadalafil tablets are usually taken once half an hour before each sexual intercourse. If you need to use the medication, consult a medical professional and use it as prescribed by your doctor.