Drinking water has little effect on tadalafil efficacy and adverse reactions, taking tadalafil usually does not require drinking more water, if you take tadalafil after serious adverse reactions, you need to seek medical attention. Tadalafil can treat erectile dysfunction, drinking more water has little effect on increasing or decreasing the efficacy of the drug. In addition, patients may experience adverse reactions such as headache, indigestion, back pain, muscle pain, nasal congestion, and facial flushing after taking tadalafil. Drinking more water at this time also has little effect on improving the adverse reactions, so it is usually not necessary to drink more water after taking tadalafil. If the patient headache or back pain and other adverse reactions are serious, you need to go to the hospital in time, the doctor will be based on the patient’s condition to choose the appropriate measures for treatment. Normal patients taking tadalafil usually do not need to drink more water, it is recommended that patients can take tadalafil under the guidance of the doctor, should not be unauthorized use of medication treatment. In addition, lactating and pregnant women, as well as people under 18 years of age are prohibited from taking tadalafil. Patients need to take tadalafil 30 minutes before sexual intercourse takes place. If the patient is allergic to tadalafil, it is forbidden to take the drug.