Crantex ER Side Effects

Generic name: guaifenesin / phenylephrine

Note: This document contains side effect information about guaifenesin / phenylephrine. Some of the dosage forms listed on this page may not apply to the brand name Crantex ER.

Some side effects of Crantex ER may not be reported. Always consult your doctor or healthcare specialist for medical advice. You may also report side effects to the FDA.

For the Consumer

Applies to guaifenesin / phenylephrine: oral capsule, oral capsule extended release, oral drops, oral liquid, oral syrup, oral tablet, oral tablet extended release

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

Stop using this medication and call your doctor at once if you have any of these serious side effects:

• fast, pounding, or uneven heartbeat;

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

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

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

• nausea, stomach pain, low fever, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes).

Less serious side effects of guaifenesin / phenylephrine may include:

• vomiting, upset stomach;

• warmth, tingling, or redness under your skin;

• feeling excited or restless (especially in children);

• sleep problems (insomnia);

• skin rash or itching;

• headache; or

• dizziness.

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 guaifenesin / phenylephrine: oral capsule, oral capsule extended release, oral drops, oral liquid, oral suspension, oral syrup, oral tablet, oral tablet extended release

Cardiovascular

Cardiovascular side effects have included tachycardia, palpitations, arrhythmias, and cardiovascular collapse with hypotension.

Nervous system

Nervous system side effects have included central nervous system depression, tremor, headache, dizziness, restlessness, insomnia, and convulsions.

Psychiatric

Psychiatric side effects have included fear, nervousness, anxiety, and hallucinations.

Gastrointestinal

Gastrointestinal side effects have included nausea and vomiting.

Respiratory

Respiratory side effects have included breathing difficulty.

Genitourinary

Genitourinary side effects have included dysuria.

Dermatologic

Dermatologic side effects have included pallor.

General

General side effects have included weakness.

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