Femalegra 100 contains sildenafil as the main ingredient in the drug. Femalegra 100 is a drug used when women suffer from sex related problems. These tablets are taken 1 hour before sex. The effect lasts for 4-5 hours after taking it. It is advisable to consult a doctor before taking Femalegra. Femalegra 100 should not be used by people under 18 years of age. Femalegra 100 is ED's best drug.