As far as I am aware, throat dryness is not one of the side effects normally associated with Mucinex (guaifenesin).
Dry mouth and throat is more often associated with the use of antihistamines - which are common ingredients in over-the-counter cough and cold preparations. They are used to help dry up the nasal passages.
- Mucinex Information for Consumers
- Mucinex Information for Healthcare Professionals (includes dosage details)
- Side Effects of Mucinex (detailed)
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