This group comprises other nervous system drugs, which cannot be classified in the preceding 2nd levels in ATC group N.

This group comprises drugs used for maintenance treatment of addictive disorders. Drugs used for detoxification are classified in V03A - All other therapeutic products.

Low strength formulations of buprenorphine (equal or less than 0.4 mg) are classified in N02AE. Naltrexone is classified in N07BB - Drugs used in alcohol dependence.
Combinations of buprenorphine and naloxone are classified here.
Morphine used for treatment of opioid dependence is classified in N02AA01.