Dextromethorphan / guaifenesin / phenylephrine Side Effects
Medically reviewed by Drugs.com. Last updated on Jan 24, 2022.
For the Consumer
Applies to dextromethorphan / guaifenesin / phenylephrine: oral liquid, oral suspension, oral syrup, oral tablet, oral tablet extended release
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;
severe headache, blurred vision, pounding in your neck or ears;
slow breathing; or
unusual changes in mood or behavior.
Common side effects may include:
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
The manufacturer has not provided adverse event information.[Ref]
More about dextromethorphan / guaifenesin / phenylephrine
- Drug interactions
- Dosage information
- During pregnancy
- Reviews (20)
- Imprints, shape & color data
- Pricing & coupons
- Drug class: upper respiratory combinations
Related treatment guides
1. "Product Information. Presgen B (brompheniramine/dextromethorph/phenylephrine)." KramerNovis (2019):
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.