ABT-724 is a drug which acts as a dopamine agonist, and is selective for the D<sub>4</sub> subtype. It was developed as a possible drug for the treatment of erectile dysfunction, although poor oral bioavailability means alternative drugs such as ABT-670 may be more likely to be developed commercially. Nonetheless, it continues to be used in scientific research into the function of the D<sub>4</sub> receptor.