Guidelines for ATC classification and DDD assignment - WHOCC

Intravaginal and intrauterine devices containing hormones are classified
in G02B.
Transdermal patches for contraception are classified here.
The DDDs are based on use as contraceptives.
The DDDs of combined preparations of estrogen and progestogen
and plain progestogen products are based on use in menstrual
cycles of 28 days. Thus, the DDD is 0.75 and 1 UD for 21 and 28
tablets cycle package, respectively.
The same principle is used for transdermal patches.
The DDDs for preparations only used in postcoital contraception
are based on the course dose.
G03AA Progestogens and estrogens, fixed combinations
This group comprises preparations, which contain fixed combinations of
progestogen and estrogens.
The preparations are classified at 5th levels according to the
progestogen.
G03AB Progestogens and estrogens, sequential preparations
This group comprises preparations with varying contents of
progestogens and estrogens adjusted to the normal hormonal cycle. A
package which is intended for one cycle, may contain e.g. three types of
tablets, each designed to cover a special part of the menstrual period.
Cycle packages may contain some tablets with progestogen only.
5th levels are built up as in G03AA.
G03AC Progestogens
This group includes hormonal contraceptives, which contain
progestogens only.
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