Fildena Double 200 mg is a high-strength erectile dysfunction medication containing sildenafil citrate, the same active ingredient found in Viagra. It works by increasing blood flow to the penis, helping men achieve and maintain an erection during sexual stimulation. Because 200 mg is a strong dose, it is generally considered only for those who have not responded to lower strengths and <strong data-start="499" data-end="507">must be used under medical guidance. Possible side effects include headache, flushing, dizziness, nasal congestion, and vision changes. It should not be combined with nitrates, alcohol excess, or certain heart medications. Always consult a doctor before use to ensure safety and proper dosing.