Guidelines for ATC classification and DDD assignment - WHOCC

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Combinations with cardiac glycosides, see C01A.
Combinations with rauwolfia alkaloids, see C02AA.
Combinations with beta blocking agents, see C07.
Combinations with calcium channel blockers, see C08.
C01DA Organic nitrates
This group comprises nitrates used on the indication angina pectoris,
including transdermal preparations. Amyl nitrite is classified in
V03AB - Antidotes.
Combinations of isosorbide dinitrate and hydralazine are classified in
C01DA58.
All nitrate preparations in combination with psycholeptics are classified
in C01DA70. Nitrates in combination with psycholeptics and other
agents are also given the code C01DA70.
The DDDs for the nitrates are mainly based on the treatment of
angina pectoris attacks (3-4 times daily). The DDDs of
preparations for oral and transdermal administration are higher than
the DDDs for other routes of administration (e.g. sublingual) due to
a lower bioavailability.
The DDDs for some preparations are mainly based on prophylaxis,
for instance the DDDs of isosorbide dinitrate and glyceryl trinitrate
plaster.
No DDDs are established for parenteral preparations due to great
differences in the dosages used.
C01DB Quinolone vasodilators
C01DX Other vasodilators used in cardiac diseases
This group comprises vasodilators used in cardiac diseases, which
cannot be classified in the preceding groups.