G-Supress DX Side Effects

Generic name: dextromethorphan / guaifenesin / phenylephrine

Medically reviewed by Drugs.com. Last updated on Jan 14, 2025.

Note: This document provides detailed information about G-Supress DX Side Effects associated with dextromethorphan / guaifenesin / phenylephrine. Some dosage forms listed on this page may not apply specifically to the brand name G-Supress DX.

Applies to dextromethorphan / guaifenesin / phenylephrine: oral liquid, oral syrup, oral tablet.

Get emergency medical help if you have signs of an allergic reaction: hives, difficult breathing, swelling of your face, lips, tongue, or throat.

Stop using this medicine and call your doctor at once if you have:

• little or no urination;

• fast or slow heartbeats;

• confusion, dizziness, feeling unsteady;

• nervousness, sleep problems (insomnia);

• severe nausea or vomiting;

• severe headache, blurred vision, pounding in your neck or ears;

• slow breathing; or

• unusual changes in mood or behavior.

Common side effects may include:

• diarrhea, constipation;

• dizziness, drowsiness;

• sleep problems (insomnia); or

• feeling nervous, restless, or irritable.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects.

For healthcare professionals

Applies to dextromethorphan/guaifenesin/phenylephrine: oral capsule, oral liquid, oral suspension, oral suspension extended release, oral syrup, oral tablet, oral tablet extended release.

General adverse events

The manufacturer has not provided adverse event information.^[Ref]

See also:

Further information

G-Supress DX side effects can vary depending on the individual. Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Note: Medication side effects may be underreported. If you are experiencing side effects that are not listed, submit a report to the FDA by following this guide.

Medical Disclaimer