Gentex LQ Side Effects

Generic name: carbetapentane / guaifenesin / phenylephrine

Medically reviewed by Drugs.com. Last updated on Apr 8, 2024.

Note: This document provides detailed information about Gentex LQ Side Effects associated with carbetapentane / guaifenesin / phenylephrine. Some dosage forms listed on this page may not apply specifically to the brand name Gentex LQ.

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

Important warnings This medicine can cause some serious health issues

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:

• fast or pounding heartbeats;

• confusion, hallucinations, unusual thoughts or behavior;

• severe dizziness, anxiety, restless feeling, or nervousness;

• little or no urinating;

• easy bruising or bleeding, unusual weakness, fever, chills, body aches, flu symptoms; or

• dangerously high blood pressure (severe headache, blurred vision, buzzing in your ears, anxiety, chest pain, shortness of breath, uneven heartbeats, seizure).

Common side effects may include:

• dizziness, drowsiness, headache, weakness;

• dry mouth, nose, or throat, increased sweating or urination;

• nausea, mild stomach pain;

• sleep problems (insomnia); or

• feeling restless or excited (especially in children).

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.

General adverse events

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

Nervous system

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

Further information

Gentex LQ 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.

Some side effects may not be reported. You may report them to the FDA.

Medical Disclaimer