Theophylline is off the OTC market. Ephedrine may be next.
Chase
S L
SL
D001993:Bronchodilator Agents / Q000009:adverse effects*; D006801:Humans; D004366:Nonprescription Drugs / Q000009:adverse effects*; D013806:Theophylline / Q000009:adverse effects*; D014481:United States; D014486:United States Food and Drug Administration
D001993:Bronchodilator Agents; D004366:Nonprescription Drugs; D013806:Theophylline