A ALIMENTARY TRACT AND METABOLISM

 B BLOOD AND BLOOD FORMING ORGANS

 C CARDIOVASCULAR SYSTEM

 D DERMATOLOGICALS

 G GENITO URINARY SYSTEM AND SEX HORMONES

 H SYSTEMIC HORMONAL PREPARATIONS, EXCL. SEX HORMONES AND INSULINS

 J ANTIINFECTIVES FOR SYSTEMIC USE

 L ANTINEOPLASTIC AND IMMUNOMODULATING AGENTS

 M MUSCULO-SKELETAL SYSTEM

 N NERVOUS SYSTEM

   N01 ANESTHETICS

   N02 ANALGESICS

     N02A OPIOIDS

       N02AA Natural opium alkaloids

       N02AB Phenylpiperidine derivatives

       N02AC Diphenylpropylamine derivatives

       N02AD Benzomorphan derivatives

       N02AE Oripavine derivatives

       N02AF Morphinan derivatives

       N02AG Opioids in combination with antispasmodics

       N02AJ Opioids in combination with non-opioid analgesics

       N02AX Other opioids

         N02AX01 Tilidine [DG:DG00823]

         N02AX02 Tramadol [DG:DG00824]

         N02AX03 Dezocine

         N02AX05 Meptazinol [DG:DG00825]

         N02AX06 Tapentadol [DG:DG00826]

         N02AX07 Oliceridine

         N02AX51 Tilidine and naloxone

     N02B OTHER ANALGESICS AND ANTIPYRETICS

     N02C ANTIMIGRAINE PREPARATIONS

   N03 ANTIEPILEPTICS

   N04 ANTI-PARKINSON DRUGS

   N05 PSYCHOLEPTICS

   N06 PSYCHOANALEPTICS

   N07 OTHER NERVOUS SYSTEM DRUGS

 P ANTIPARASITIC PRODUCTS, INSECTICIDES AND REPELLENTS

 R RESPIRATORY SYSTEM

 S SENSORY ORGANS

 V VARIOUS