Despec DM Syrup Side Effects
Generic name: dextromethorphan / guaifenesin / phenylephrine
Medically reviewed by Drugs.com. Last updated on Jan 24, 2022.
Note: This document contains side effect information about dextromethorphan / guaifenesin / phenylephrine. Some dosage forms listed on this page may not apply to the brand name Despec DM Syrup.
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 Despec DM Syrup (dextromethorphan / guaifenesin / phenylephrine)
- Check interactions
- Latest FDA alerts (3)
- Dosage information
- During pregnancy
- 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.