Doctor insights on:
Does Mucinex Make You Drowsy
No ( if used alone): Mucinex (guaifenesin) alone is not associated with drowsiness. Common side effects may include headache, dizziness, nausea/vomiting. Be careful when using combination products which may contain antihistamines as these may cause drowsiness. Take with a full glass of water. Do not use for > 7 days.If problem persists /worsen see a doctor. Hope you feel better soon. ...Read more
Older ones do: First generation antihistamines (benadryl, clor-pheramine, atarax) cross the blood brain barrier and cause lethargy. Second generation (allegra, claritin, zyrtec, xyzal, (levocetirizine) clarinex) cause the blood brain barrier at a much lesser amount and more targeted to the h1 receptor. ...Read more
Antihistamine: Antihistamines can still cause drowsiness even if it says, non-drowsy, especially loratadine. Paradoxical effects of hyperactivity can be a side effect of antihistamines, though it tends to happen mostly in the very young or old. If you took a decongestant with it, then that can also cause hyperactivity. ...Read more
Not likely: Tessalon perles (benzonatate) are used to treat coughing. They provide a local anesthetic to cough receptor triggers. It is unlikely that they would cause fatigue or drowsiness, but to be sure, don't take your fist dose ever and then operate a car, boat, plane, tractor, etc. ...Read more
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