Check with your doctor if any of these most COMMON side effects persist or become bothersome when using NyQuil Multi-Symptom:
Constipation; diarrhea; dizziness; drowsiness; excitability; headache; loss of appetite; nausea; nervousness or anxiety; trouble sleeping; upset stomach; vomiting; weakness.
Talk to your pharmacist/doc. if any of these SEVERE side effects occur when using NyQuil Multi-Symptom:
Severe allergic reactions (rash; hives; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); difficulty urinating or inability to urinate; fast or irregular heartbeat; hallucinations; seizures; severe dizziness, lightheadedness, or headache; stomach pain; tremor; trouble sleeping; vision changes; yellowing of skin or eyes.
Irregular heartbeat or fast heartbeat is a side effect, hope this helps?
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