Fildena CT 50 mg is commonly marketed as a chewable sildenafil citrate medicine for treating erectile dysfunction (ED) in adult men. Sildenafil belongs to the phosphodiesterase type-5 (PDE5) inhibitor class and supports the natural erection process by increasing blood flow to the penis during sexual stimulation. Sildenafil must not be combined with nitrate medicines such as nitroglycerin because this combination can cause a potentially dangerous drop in blood pressure. Caution may also be necessary with alpha-blockers and certain blood-pressure medicines.