Sildenafil is taken in different numbers of tablets depending on the size, with a general recommendation of 50mg daily and a maximum dose of no more than 100mg, under medical supervision.
For most patients, the regular recommended dose of sildenafil is 50mg taken up to once daily.
Sildenafil is available in two dosing regimens, one on an as-needed basis and one for long-term regular dosing. Because each person has a different health condition and tolerates the drug differently, the maximum can be increased to 100mg per day. when the patient has a special health condition, the dosage should be adjusted under the supervision of a doctor.
When the patient is older than 65 years of age, liver damage such as cirrhosis, severe renal impairment, taking a potent cytochrome inhibitor such as ketoconazole, taking erythromycin, as higher plasma levels in such patients may increase the effectiveness of the drug, the dosage should be reduced and started from 25mg.
Common adverse reactions include headache, flushing, dyspepsia, abnormal vision, and nausea.
Sildenafil is forbidden to be used with nitrate drugs such as nitroglycerin and isosorbide nitrate; forbidden to be used in combination with guanylate cyclase agonists, such as leucovorin; forbidden to be used by those who are allergic to this product and its ingredients.
Should be strictly under the guidance of the doctor reasonable use of drugs.