The main difference between tadalafil tablets 10 mg and 20 mg is that the dosage is not the same, and when the dosage is different, the potency of the drug is also different, as are the side effects. Tadalafil is a selective type 5 phosphodiesterase inhibitor that generally treats erectile dysfunction in men. For patients with mild erectile dysfunction, tadalafil 10 mg dosage form can be used, need to choose to reduce or increase the amount of medication according to the changes in the condition of the disease, for the more serious condition, tadalafil 20 mg dosage form can be used, to be similarly adjusted according to the changes in the condition of the dosage. The side effects of the drug vary depending on the dose. As the dosage increases, the chances of side effects of the drug and their severity may also increase, such as headache, nausea, and indigestion. Patients who really need to take tadalafil should do so under the guidance of a physician and should not choose to take it on their own to avoid serious consequences.