Sildenafil acts as the active ingredient in Bigfun tablets. Bigfun is taken 1 hour before intercourse. After taking Bigfun tablets, its effect lasts for 4-5 hours. Consult a doctor before taking Bigfun tablets. Bigfun is one of the best tablets of ED. Honeydew is widely used. Bigfun tablets are widely used. Bigfun is widely used by men.