Rydex Side Effects

Generic name: brompheniramine / codeine / pseudoephedrine

Medically reviewed by Drugs.com. Last updated on Feb 17, 2025.

Note: This document provides detailed information about Rydex Side Effects associated with brompheniramine / codeine / pseudoephedrine. Some dosage forms listed on this page may not apply specifically to the brand name Rydex.

Applies to brompheniramine/codeine/pseudoephedrine: oral liquid.

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

Like other narcotic medications, codeine can slow your breathing. Death may occur if breathing becomes too weak. A person caring for you should seek emergency medical attention if you have slow breathing with long pauses, blue colored lips, or if you are hard to wake up.

Stop using brompheniramine, codeine, and pseudoephedrine and call your doctor at once if you have:

• severe dizziness or drowsiness, feeling like you might pass out;

• confusion, mood changes, hallucinations, unusual thoughts or behavior;

• severe nervousness, fast or uneven heart rate, tremor, seizure (convulsions);

• pain or numbness in the arms or legs;

• severe stomach cramps or constipation;

• weak or shallow breathing;

• little or no urinating;

• easy bruising or bleeding, unusual weakness; or

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

Side effects such as dry mouth, constipation, and confusion may be more likely in older adults.

Common side effects may include:

• dizziness, drowsiness;

• dry mouth, nose, or throat;

• constipation; 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.

See also:

For healthcare professionals

Applies to brompheniramine / codeine / pseudoephedrine: oral liquid.

Hypersensitivity adverse events

• Frequency not reported: Anaphylactic shock, excessive perspiration, chills

Respiratory

• Frequency not reported: Thickening of bronchial secretions, tightness of chest, wheezing, nasal stuffiness, and dryness of mouth, nose and throat

Cardiovascular

• Frequency not reported: Hypotension, palpitations, tachycardia, extra systoles

Nervous system

• Frequency not reported: Sedation, dizziness, sleepiness, disturbed coordination, fatigue, confusion, restlessness, excitation, nervousness, tremor, irritability, insomnia, euphoria, paresthesias, vertigo, hysteria, neuritis, tinnitus, acute labyrinthitis, convulsions^[Ref]

Hematologic

• Frequency not reported: Hemolytic anemia, thrombocytopenia, agranulocytosis

Gastrointestinal

• Frequency not reported: Epigastric distress, anorexia, nausea, vomiting, diarrhea, constipation

Genitourinary

• Frequency not reported: Urinary frequency, difficult urination, urinary retention, early menses

Ocular

• Frequency not reported: Blurred vision, diplopia

Dermatologic

• Frequency not reported: Urticaria, drug rash, photosensitivity, pruritus

Further information

Rydex 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.

Note: Medication side effects may be underreported. If you are experiencing side effects that are not listed, submit a report to the FDA by following this guide.

Medical Disclaimer