Mucinex Fast-Max Severe Cold Side Effects

Generic name: acetaminophen / dextromethorphan / guaifenesin / phenylephrine

Medically reviewed by Drugs.com. Last updated on Apr 25, 2024.

Note: This document provides detailed information about Mucinex Fast-Max Severe Cold Side Effects associated with acetaminophen / dextromethorphan / guaifenesin / phenylephrine. Some dosage forms listed on this page may not apply specifically to the brand name Mucinex Fast-Max Severe Cold.

Applies to acetaminophen / dextromethorphan / guaifenesin / phenylephrine: oral capsule, oral liquid, oral tablet.

Important warnings This medicine can cause some serious health issues

Do not use this 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.

Do not take more of this medication than is recommended. An overdose of acetaminophen can damage your liver or cause death. Call your doctor at once if you have nausea, pain in your upper stomach, itching, loss of appetite, dark urine, clay-colored stools, or jaundice (yellowing of your skin or eyes).

In rare cases, acetaminophen may cause a severe skin reaction. Stop taking this medicine and call your doctor right away if you have skin redness or a rash that spreads and causes blistering and peeling.

Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

In rare cases, acetaminophen may cause a severe skin reaction that can be fatal. This could occur even if you have taken acetaminophen in the past and had no reaction. Stop taking this medicine and call your doctor right away if you have skin redness or a rash that spreads and causes blistering and peeling. If you have this type of reaction, you should never again take any medicine that contains acetaminophen.

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

• chest pain, fast, slow, or uneven heart rate;

• severe dizziness, feeling like you might pass out;

• mood changes, confusion, hallucinations;

• tremor, seizure (convulsions);

• fever;

• urinating less than usual or not at all;

• nausea, pain in your upper stomach, itching, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of your skin or eyes); or

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

Common side effects may include:

• dizziness, weakness;

• mild headache;

• mild nausea, diarrhea, upset stomach;

• dry mouth, nose, or throat;

• feeling nervous, restless, irritable, or anxious; 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.

For healthcare professionals

Applies to acetaminophen/dextromethorphan/guaifenesin/phenylephrine: oral capsule, oral liquid, oral powder for reconstitution, oral tablet.

General adverse events

The manufacturer has not provided adverse event information.^[Ref]

Further information

Mucinex Fast-Max Severe Cold 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