Allfen Side Effects

Generic Name: guaifenesin

Please note - some side effects for Allfen may not be reported. Always consult your doctor or healthcare specialist for medical advice. You may also report side effects to the FDA at http://www.fda.gov/medwatch/ or 1-800-FDA-1088 (1-800-332-1088).

Side Effects of Allfen - for the Consumer

Allfen A

All medicines may cause side effects, but many people have no, or minor side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome when using Allfen A:

Constipation; diarrhea; dizziness; drowsiness; dry mouth, nose, or throat; headache; loss of appetite; nausea; upset stomach; vomiting; weakness.

Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); blurred vision or other vision changes; changes in thinking or behavior; confusion; difficult or painful urination; excitability; fainting; fast, slow, or irregular heartbeat; fever, chills, or persistent sore throat; flushing; hallucinations; inability to urinate; loss of coordination; mood or mental changes; nervousness or anxiety; ringing in the ears or other hearing changes; seizures; severe drowsiness; severe dry mouth, nose, or throat; severe or persistent dizziness, lightheadedness, or headache; shortness of breath; slow or irregular breathing; tremor; trouble sleeping; unusual bruising or bleeding; unusual tiredness or weakness.

Allfen

All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome when using Allfen:

Dizziness; headache; nausea; upset stomach; vomiting.

Severe allergic reactions (rash; hives; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); lower back or side pain.

Allfen CX Sustained-Release Tablets

All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome when using Allfen CX Sustained-Release Tablets:

Drowsiness; dry mouth, nose, or throat; upset stomach.

Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue).

This is not a complete list of all side effects that may occur. If you have questions about side effects, contact your health care provider. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088. You may also report side effects at http://www.fda.gov/medwatch .

Side Effects by Body System

Gastrointestinal

Gastrointestinal side effects have included nausea, vomiting, and stomach discomfort.

Nervous system

Nervous system side effects have included dizziness and headache.

Dermatologic

Dermatologic side effects have included skin rash and urticaria.

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