Sildenafil acts as the secret ingredient in Fildena 150. Fildena 150 is the best drug used mainly by men. Fildena 150 is the most powerful drug. Consult a doctor before taking Fildena drug. This drug is the best drug used by men. Fildena 150 drug is the most popular drug. Fildena works by increasing blood flow to the vagina during sex.