Fildena 100mg is a prescription medication used to treat erectile dysfunction (ED), with sildenafil citrate as its active ingredient. It works by increasing blood flow to the penis during sexual stimulation. Fildena 100mg should be taken as directed by a doctor, typically about one hour before sexual activity and no more than once a day. Common side effects include headaches and flushing, but it's crucial to consult a doctor before use, especially if you have pre-existing heart conditions or are taking other medications like nitrates