Theraflu Cold & Sore Throat Side Effects

Generic name: acetaminophen / pheniramine / phenylephrine

Medically reviewed by Drugs.com. Last updated on Nov 13, 2023.

Note: This document contains side effect information about acetaminophen / pheniramine / phenylephrine. Some dosage forms listed on this page may not apply to the brand name Theraflu Cold & Sore Throat.

Applies to acetaminophen / pheniramine / phenylephrine: oral powder for reconstitution.

Get emergency medical help if you have any of these signs of an allergic reaction while taking acetaminophen/pheniramine/phenylephrine: 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 the medicine and call your doctor at once if you have:

• chest pain, rapid pulse, fast or uneven heart rate;

• confusion, hallucinations, tremor, severe dizziness or anxiety;

• slow, shallow breathing;

• little or no urinating;

• easy bruising or bleeding, unusual weakness;

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

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

Common side effects may include:

• dryness of the eyes, nose, and mouth;

• blurred vision;

• dizziness, drowsiness, problems with memory or concentration;

• ringing in your ears;

• feeling restless or irritable; or

• mild nausea, stomach pain, constipation.

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/pheniramine/phenylephrine: oral powder for reconstitution.

Hepatic

Frequency not reported: Hepatotoxic action and nephrotoxicity with prolonged high dose use^[Ref]

Cardiovascular

Frequency not reported: Palpitations, blood pressure increase^[Ref]

Nervous system

Frequency not reported: Hyperexcitability, drowsiness, dizziness, accommodative palsy, sleep disorder^[Ref]

Hematologic

Frequency not reported: Changes in blood count with prolonged high dose use^[Ref]

Hypersensitivity

Frequency not reported: Possible allergic reactions (skin rash, pruritus, hives, angioedema)^[Ref]

Gastrointestinal

Frequency not reported: Nausea, vomiting, stomach pain, dry mouth^[Ref]

Genitourinary

Frequency not reported: Urinary retention^[Ref]

Ocular

Frequency not reported: Increase in intraocular pressure^[Ref]

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.

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