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Pharmaceutical and healthcare online databases.
Over 200,000 approved drugs and health products.
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Level 3
R - Respiratory systemR03 - Drugs for obstructive airway diseasesR03D - Other systemic drugs for obstructive airway diseases
R03DA - XanthinesR03DB - Xanthines and adrenergicsR03DC - Leukotriene receptor antagonistsR03DX - Other systemic drugs for obstructive airway diseases
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