If there is no response after taking tadalafil tablets, the possible reasons include: 1. The time to take the drug is longer than the time for the drug to take effect, tadalafil tablets can be taken before sex 24 disappear, if taken too early it may not produce any effect, because the metabolic period of the drug has passed. 2. After taking tadalafil tablets must receive certain sexual stimulation to produce a good erection, if not receiving If you do not receive good sexual stimulation, you will not get an erection. It is necessary to receive sensory, verbal or action stimulation to produce an obvious erection. It is only an erection aid, not a direct stimulation that can lead to an erection. So there are many patients who only wait for an erection after taking the pill and do not receive the relevant sensory stimulation, so they will not have a good erection. The time of taking the pill plus certain sexual stimulation is the necessary factor for a good erection after taking the pill.