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Carbetapentane / guaifenesin / phenylephrine Side Effects

Medically reviewed by Drugs.com. Last updated on Apr 17, 2022.

Applies to carbetapentane/guaifenesin/phenylephrine: oral liquid, oral syrup, oral tablet, oral tablet extended release.

Warning

Do not give this medication to a child younger than 4 years old. Always ask a doctor before giving a cough or cold medicine to a child. Death can occur from the misuse of cough and cold medicines in very young children.

Do not use a cough or cold medicine if you have taken an MAO inhibitor in the past 14 days. A dangerous drug interaction could occur. MAO inhibitors include isocarboxazid, linezolid, phenelzine, rasagiline, selegiline, and tranylcypromine.

Get emergency medical help if you have any of these signs of an allergic reaction while taking carbetapentane/guaifenesin/phenylephrine: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

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

Common side effects may include:

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 carbetapentane/guaifenesin/phenylephrine: oral liquid, oral syrup, oral tablet, oral tablet extended release.

Nervous system

Nervous system side effects have included nervousness, lightheadedness, excitability, restlessness, dizziness, tenseness, convulsions, CNS depression, and insomnia.[Ref]

Cardiovascular

Cardiovascular side effects have included arrhythmias and hypotension with cardiovascular collapse.[Ref]

Gastrointestinal

Gastrointestinal side effects have included nausea and vomiting.[Ref]

Psychiatric

Psychiatric side effects have included fear, anxiety, and hallucinations.[Ref]

Respiratory

Respiratory side effects have included respiratory difficulty.[Ref]

Genitourinary

Genitourinary side effects have included dysuria.[Ref]

General

General side effects have included weakness and pallor.[Ref]

References

1. Product Information. Phencarb GG (carbetapentane / guaifenesin / phenylephrine). Boca Pharmacal Inc. 2004.

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.