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

 P ANTIPARASITIC PRODUCTS, INSECTICIDES AND REPELLENTS

 R RESPIRATORY SYSTEM

   R01 NASAL PREPARATIONS

   R02 THROAT PREPARATIONS

   R03 DRUGS FOR OBSTRUCTIVE AIRWAY DISEASES

     R03A ADRENERGICS, INHALANTS

     R03B OTHER DRUGS FOR OBSTRUCTIVE AIRWAY DISEASES, INHALANTS

     R03C ADRENERGICS FOR SYSTEMIC USE

     R03D OTHER SYSTEMIC DRUGS FOR OBSTRUCTIVE AIRWAY DISEASES

       R03DA Xanthines

       R03DB Xanthines and adrenergics

       R03DC Leukotriene receptor antagonists

         R03DC01 Zafirlukast

         R03DC02 Pranlukast [DG:DG01065]

         R03DC03 Montelukast [DG:DG01066]

         R03DC04 Ibudilast

         R03DC53 Montelukast, combinations

       R03DX Other systemic drugs for obstructive airway diseases

   R05 COUGH AND COLD PREPARATIONS

   R06 ANTIHISTAMINES FOR SYSTEMIC USE

   R07 OTHER RESPIRATORY SYSTEM PRODUCTS

 S SENSORY ORGANS

 V VARIOUS