ivermectin dosage for dogs Each tablet contains 20 mg of tadalafil, USP and the following inactive ingredients croscarmellose sodium, iron oxide red, iron oxide yellow, lactose monohydrate, microcrystalline cellulose, polyethylene glycol, polyvinyl alcohol-part hydrolyzed, povidone, sodium lauryl sulfate, sodium starch glycolate, sodium stearyl fumarate, talc, and titanium dioxide