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Sildenafil Citrate in Fildena 150 mg works by inhibiting the enzyme phosphodiesterase type 5 (PDE5). This inhibition leads to relaxation of the smooth muscles in the blood vessels of the penis, allowing for increased blood flow when sexually aroused. Improved blood flow is essential for achieving and maintaining an erection. Common side effects of Fildena 150 mg may include headache, flushing, indigestion, nasal congestion, and changes in vision. If you experience severe or persistent side effects, seek medical attention promptly.