Sildenafil can be taken 5 times a month, but the medication should be reasonably arranged under the guidance of a doctor and according to one’s physical condition. Sildenafil is generally used for the treatment of erectile dysfunction in men, and should be taken once a day at most, and should be careful not to exceed the dosage of 100mg.Sildenafil can be used according to the need to take and regular long-term use, different methods of taking for different people, should be diagnosed by a doctor to confirm the physical condition, choose a reasonable way of using the drug. Sildenafil can have adverse reactions such as headache, indigestion, hearing abnormality, etc. It is recommended to reduce the frequency of dosing if regular long-term dosing is not required. It should be noted that sildenafil is generally not recommended to be used with any nitrate drugs such as nitroglycerin, which will enhance the antihypertensive effect of nitrate drugs. It should be taken on the advice of a doctor and should not be used blindly.