Fildena CT 100 contains sildenafil 100 mg, it can be taken after a meal. Sildenafil can be taken with or without food. D DailyMed +1 However, if you've just eaten a large or high-fat meal, the medicine may take longer to start working. For a more predictable/faster onset, taking it on a relatively empty stomach or after a light meal is generally preferable. D DailyMed A few important points: 100 mg is the maximum recommended single dose of sildenafil, and it should not be taken more than once in 24 hours. D DailyMed It is usually taken about 1 hour before ***** activity. Do not combine it with nitrates (such as nitroglycerin) or another ED medicine such as tadalafil or vardenafil. D DailyMed +1 ***** stimulation is still required for an erection. If you tell me what you ate and how long ago, I can explain how likely it is to delay the effect.