R - Respiratory System
Sub-classes
R01 - Nasal preparations
2 sub-classes
R02 - Throat preparations
1 sub-classes
R03 - Drugs for obstructive airway diseases
4 sub-classes
R05 - Cough and cold preparations
3 sub-classes
R06 - Antihistamines for systemic use
1 sub-classes
R07 - Other respiratory system products
1 sub-classes