Tadalafil, generic name called tadalafil tablets; sildenafil generic name for sildenafil citrate tablets; from the duration of the drug effect to consider, if you want the effect to last longer and less restricted, tadalafil is better. Tadalafil tablets and sildenafil citrate tablets are both drugs for treating male erectile dysfunction, each with its own merits, none of which has obvious superiority, and should be chosen according to the individual’s situation and needs. Tadalafil tablets are effective within 36 hours after taking them; while sildenafil citrate tablets are effective within 0.5 to 4 hours after taking them, and tadalafil efficacy lasts longer. It is important to note that people who are allergic to both drugs are strictly prohibited from taking them, as well as patients who are taking any form of nitrate medication are not allowed to take tadalafil tablets; adverse reactions include headache, dizziness, nausea, indigestion, abnormal vision, nasal congestion, back pain, flushing of the skin, and skin rashes. The two products have their own benefits, but they are prescription drugs, which can only be purchased by a doctor’s pharmacy; patients need to choose according to their own situation under the guidance of a physician; if there are uncomfortable symptoms after taking them, they should seek medical attention in a timely manner.