Skip to Content

The originating document has been archived. We cannot confirm the completeness, accuracy and currency of the content.

Guaifenesin / phenylephrine / pseudoephedrine Side Effects

Applies to guaifenesin / phenylephrine / pseudoephedrine: liquid

Check with your doctor if any of these most COMMON side effects persist or become bothersome:

Dizziness; excitability; headache; nausea; nervousness or anxiety; trouble sleeping; weakness.

Seek medical attention right away if any of these SEVERE side effects occur while taking guaifenesin / phenylephrine / pseudoephedrine:

Severe allergic reactions (rash; hives; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); difficulty urinating; fast or irregular heartbeat; hallucinations; seizures; severe dizziness, lightheadedness, or headache; tremor.

Not all side effects for guaifenesin / phenylephrine / pseudoephedrine may be reported. You should always consult a doctor or healthcare professional for medical advice. Side effects can be reported to the FDA here.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Some side effects may not be reported. You may report them to the FDA.

More about guaifenesin/phenylephrine/pseudoephedrine

Hide