This group comprises all hormonal preparations for systemic use, except:
- Insulins, see A10.
- Anabolic steroids, see A14.
- Catecholamines, see C01C and R03C.
- Sex hormones, see G03.
- Sex hormones used in treatment of neoplastic diseases, see L02.
- Metreleptin used for treatment of complications of leptin deficiency in patients with generalised lipodystrophy is classified in A16AA.

Drugs acting on calcium homeostasis are classified in this group.
Vitamin-D preparations, see A11CC.

Calcitonin, natural and synthetic, is classified in this group. Other drugs for treatment of hypercalcemia, see M05B.