Com Bookmark Expert - Fildena 150 Fildena 25mg tablets are the lowest dosage available. Fildena may be prescribed in the lowest dosage (or may not be recommended for you) if you take any of the following medications as they may cause a dangerous drop in blood pressure: You can take Fildena 25mg from four hours to half an hour before you have sex. Mon, 30 Jul 2018 17:20:23 UTC en