Taking tadalafil can help male patients improve their erectile dysfunction symptoms. However, you need to follow the doctor’s instructions to use the drug correctly to reduce the chance of adverse drug reactions. Tadalafil is a selective reversible inhibitor of cyclic guanosine monophosphate-specific phosphodiesterase 5, which is one of the commonly used medications for the treatment of erectile dysfunction in men. It is usually taken about 1 to 2 hours before intercourse. During intercourse, it is important to use sexual stimulation to bring out the effect of the drug. The absence of sexual stimulation can cause the medication to not work. The use of tadalafil may cause adverse reactions such as headache, back pain, and indigestion. Tadalafil is contraindicated in people who are allergic to any of the ingredients in the product, patients who are taking any form of nitrates, guanylate cyclase stimulators, women, children and other people. To ensure the safety of medication. Patients need to use the drug as prescribed by the doctor.