Yes, one of the side effects is insomnia.
Keep taking Mucinex D and talk to your doctor if you have any of these less serious Mucinex D side effects:
dizziness or headache;
feeling excited or restless;
*sleep problems (insomnia);*
nausea, vomiting, or stomach upset;
mild loss of appetite;
warmth, tingling, or redness under your skin; or
skin rash or itching.
This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect. You may report side effects to FDA at 1-800-FDA-1088.
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