Extra Super Avana Tablet Avanafil & dapoxetine are active ingredients of the drug PDE5 inhibitor (phosphodiesterase type 5 inhibitor). Resting the muscles increases blood flow to certain parts of the body. It inhibits PDE5 in smooth muscle cells lining the blood vessels that supply the corpus cavernosum to the penis. In addition, it is usually a fast-acting drug that passes through the body at an even faster rate than most erectile dysfunction drugs.