After taking Fildena 200mg, which contains sildenafil citrate, users can expect it to take effect within 30 to 60 minutes, allowing for improved blood flow to the penile and facilitating erections during sexual stimulation. The effects typically last for about 4 to 6 hours, providing a window for sexual activity. Some individuals may experience side effects such as headaches, flushing, or nasal congestion, which are usually mild and temporary. It’s important to note that sexual arousal is still necessary for the medication to work effectively.