The topical decongestant has a hard time limit and a specific consequence for exceeding it: rebound congestion sends the patient back to the same bottle. The two antitussives then work at opposite ends of one reflex — benzonatate numbs the receptors where a cough starts, dextromethorphan suppresses the center in the medulla that organizes it — and that difference decides which one a patient on an antidepressant can safely have. What these do and do not ask. Indications and adverse effects are in — each agent is asked for what it is used for and what it does to the patient. Dosing and formulations are out, so nothing here turns on a milligram or a strength, which is why the sets are 17 to 19 rather than the usual 30. Every option carries its own reason, correct and incorrect alike.
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