One pill a day of Silagra 100 is generally the prescribed regimen. The recommended dose of Sildenafil is 50 mg taken roughly 1 hour before sexual activity. However, Sildenafil may be taken anywhere from half an hour to 4 hours before sexual activity. Based on effectiveness and toleration, the dose may be increased to a maximum of 100 mg or decreased to 25 mg. The maximum recommended dosing frequency is once per day.