The sildenafil ed trial pack generic ( https://www.genericviagrakart.com/trialpack ) is a great value pack that contains 20 sildenafil citrate tablets. The active ingredient is sildenafil citrate that acts efficaciously to boost blood flow to the penile organ by inhibiting the PDE5 enzyme. This drug helps a man to attain an erection when a man is sexually aroused. However, this medicine works only when a man is sexually stimulated.