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Supress A Side Effects

Generic name: dexbrompheniramine / dextromethorphan / phenylephrine

Medically reviewed by Last updated on Apr 17, 2022.

Note: This document contains side effect information about dexbrompheniramine / dextromethorphan / phenylephrine. Some dosage forms listed on this page may not apply to the brand name Supress A.

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

Do not use this medicine if you have used an MAO inhibitor in the past 14 days, such as isocarboxazid, linezolid, methylene blue injection, phenelzine, rasagiline, selegiline, or tranylcypromine.

Do not use cough or cold medicine to make a child sleepy.

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:

  • fast, pounding, or irregular heartbeats;

  • shortness of breath;

  • severe dizziness or nervousness;

  • little or no urination;

  • trouble sleeping; or

  • increased blood pressure--severe headache, blurred vision, pounding in your neck or ears, anxiety, nosebleed.

Common side effects may include:

  • flushing (warmth, redness, or tingly feeling);

  • dry mouth, nose, or throat;

  • feeling nervous, restless, or irritable;

  • dizziness, drowsiness;

  • feeling restless or excited (especially in children);

  • loss of appetite;

  • blurred vision; or

  • sleep problems (insomnia).

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

More about Supress A (dexbrompheniramine / dextromethorphan / phenylephrine)

Patient resources

Other brands

Alahist CF, Alahist DM, G-P-Tuss DXP, Panatuss DXP, Supress A Pediatric

Related treatment guides

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.