Fildena 150 mg is the higher-strength version of Fildena, which has 150 mg of Sildenafil Citrate as its active ingredient. This dosage is usually prescribed for individuals who are treated with this medication during sexual intercourse. A person should take the medicine 30-35 minutes before sexual intercourse. Get more excited with your partner. It is a drug used in the treatment of ED in men. This medicine works for 4-5 hours.