is_about respiratory system ATC Classification System ATC Code R Respiratory system ATC_code:R R RESPIRATORY SYSTEM Inhaled antiinfectives are classified in ATC group J - Antiinfectives for systemic use. R01 NASAL PREPARATIONS R02 THROAT PREPARATIONS R03 DRUGS FOR OBSTRUCTIVE AIRWAY DISEASES R05 COUGH AND COLD PREPARATIONS This group comprises a large number of preparations, most of which are combined preparations. Cold preparations containing therapeutic levels of antiinfectives should be classified in ATC group J - Antiinfectives for systemic use. Cold preparations with therapeutic levels of analgesics/anti-inflammatory agents should be classified in the respective N02/M01 groups, at separate 5th levels by using the 50-series. Cold preparations with both antiinfectives and analgesics should be classified in ATC group J - Antiinfectives for systemic use. Cold preparations with minimal amounts of antiinfectives or analgesics are classified in R05X - Other cold preparations. See also R01 - Nasal preparations, R02 - Throat preparations, and R03D - Other systemic drugs for obstructive airway diseases. Fixed DDDs are assigned for combinations. These DDDs are based on an average dose regimen of three times daily, and dosages in the upper area of the recommended dose ranges are chosen. The strengths of the various components are not taken into consideration. E.g. 6 UD (= 30 ml) is the fixed DDD for products where the recommended dose is 5-10 ml. R06 ANTIHISTAMINES FOR SYSTEMIC USE R07 OTHER RESPIRATORY SYSTEM PRODUCTS Sirarat Sarntivijai Classification of drugs affecting the respiratory system.