While your doctor is your best source of the correct answer, I believe you local pharmacist can tell you what over-the-counter meds you can consider. That said, the pharmacist will surely ask about the whooping cough, is this your diagnosis, or has a doctor diagnosed the condition? If it is your guess, you may simply ask the pharmacist about cough suppressants that can be used whtn taking Zithromax... which is a medication I know nothing about.
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