FDA rethinks OTC status of bronchodilators, theophylline labeling.
D001993:Bronchodilator Agents; D004348:Drug Labeling; D006801:Humans; D004366:Nonprescription Drugs; D013806:Theophylline; D014481:United States; D014486:United States Food and Drug Administration
D001993:Bronchodilator Agents; D004366:Nonprescription Drugs; D013806:Theophylline