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Level 3
R - Respiratory systemR03 - Drugs for obstructive airway diseasesR03A - Adrenergics, inhalants
R03AA - Alpha- and beta-adrenoreceptor agonistsR03AB - Non-selective beta-adrenoreceptor agonistsR03AC - Selective beta-2-adrenoreceptor agonistsR03AH - Combinations of adrenergicsR03AK - Adrenergics and other drugs for obstructive airway diseases
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