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Level 3
R - Respiratory System
R03 - Drugs for Obstructive Airway Diseases
R03A - Adrenergics, Inhalants
R03AA - Alpha- and beta-adrenoreceptor agonists
R03AB - Non-selective beta-adrenoreceptor agonists
R03AC - Selective beta-2-adrenoreceptor agonists
R03AH - Combinations of adrenergics
R03AK - Adrenergics and other drugs for obstructive airway diseases
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