An androgen synthesis inhibitor is a type of drug which inhibits the enzymatic synthesis of androgens, such as testosterone and dihydrotestosterone (DHT). They include:CYP17A1 inhibitors : inhibit the synthesis of androgens from pregnanes 3β-Hydroxysteroid dehydrogenase inhibitors : inhibit the conversion of weaker androgens such as dehydroepiandrosterone (DHEA) and androstenediol into more potent androgens like and testosterone Cholesterol side-chain cleavage enzyme inhibitors : inhibit the synthesis of pregnenolone from cholesterol, thereby inhibiting the synthesis of most steroid hormones including androgens 17β-Hydroxysteroid dehydrogenase inhibitors : inhibit the interconversion of androgens, including the synthesis of testosterone from the less-potent androstenedione 5α-Reductase inhibitors : inhibit the conversion of testosterone into the more potent DHT Steroid sulfatase inhibitors : inhibit the conversion of inactive androgen sulfates into active androgens like testosterone