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Deconex DM Capsule (Dextromethorphan Hydrobromide, Guaifenesin, Phenylephrine): Side Effects, Uses, Dosage, Interactions, Warnings

Deconex DM

Medical Editor: John P. Cunha, DO, FACOEP Last updated on RxList: 1/27/2022

Drug Summary

What Is Deconex DM?

Deconex DM (dextromethorphan hydrobromide, guaifenesin, phenylephrine hydrochloride capsule) is a combination of a cough suppressant, an expectorant, and a nasal decongestant indicated to temporarily relieves the following symptoms due to the common cold, hay fever (allergic rhinitis) or other upper respiratory allergies: eases cough due to minor throat and bronchial irritation, helps loosen phlegm (mucus) and thin bronchial secretions to drain bronchial tubes and make coughs more productive, relieves nasal congestion, and reduces swelling of nasal passages. Deconex DM is available over-the-counter (OTC).

What Are Side Effects of Deconex DM?

Common side effects of Deconex DM include:

  • dizziness,
  • drowsiness,
  • diarrhea,
  • headache,
  • nausea,
  • trouble sleeping (insomnia),
  • nervousness,
  • restlessness, or
  • irritability.

Dosage for Deconex DM

The dose of Deconex DM for adults and children 12 years of age and over is 1 capsule every 4 hours, not to exceed 6 capsules in 24 hours.

What Drugs, Substances, or Supplements Interact with Deconex DM?

Deconex DM may interact with monoamine oxidase inhibitors (MAOIs). Tell your doctor all medications and supplements you use.

Deconex DM During Pregnancy or Breastfeeding

Tell your doctor if you are pregnant or plan to become pregnant before using Deconex DM. Consult your doctor before breastfeeding.

Additional Information

Our Deconex DM (dextromethorphan hydrobromide, guaifenesin, phenylephrine hydrochloride capsule) Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.

Description for Deconex DM Capsule

Drug Facts

Active Ingredients (in each capsule)

Dextromethorphan HBr 15 mg
Guaifenesin 390 mg
Phenylephrine HCl 10 mg

Uses for Deconex DM Capsule

Purpose

  • Cough Suppressant
  • Expectorant
  • Nasal Decongestant

Uses

Temporarily relieves these symptoms due to the common cold, hay fever (allergic rhinitis) or other upper respiratory allergies:

  • cough due to minor throat and bronchial irritation
  • helps loosen phlegm (mucus) and thin bronchial secretions to drain bronchial tubes and make coughs more productive
  • nasal congestion
  • reduces swelling of nasal passages

Dosage for Deconex DM Capsule

Directions

Do not exceed recommended dosage.

Adults and children 12 years of age and over: 1 capsule every 4 hours, not to exceed 6 capsules in 24 hours.
Children under 12 years of age: Consult a physician.

HOW SUPPLIED

Other Information

Store at controlled room temperature between 15°-30°C (59°-86°F).

Supplied in a tight, light-resistant container with a child-resistant cap.

NDC 50991-583-60

Deconex DM Capsules are purple-yellow capsules imprinted "Deconex DM" in black ink.

Contains color additives including FD&C Yellow No. 5 (tartrazine).

Inactive Ingredients

Croscarmellose Sodium, Dicalcium Phosphate Dihydrate, FD&C Blue #1, FD&C Red #3, FD&C Yellow #5, FD&C Yellow #6, Gelatin, Magnesium Stearate, Maltodextrin, Povidone, Silicon Dioxide, Stearic Acid, and Titanium Dioxide.

Questions? Comments? Call 1-800-882-1041

Manufactured for: Poly Pharmaceuticals, Quitman, MS 39355, 1 (800) 882-1041. Revised: Nov 2011

Side Effects for Deconex DM Capsule

No information provided. Please see the WARNINGS AND PRECAUTIONS sections

Drug Interactions for Deconex DM Capsule

No information provided.

Warnings for Deconex DM Capsule

Included as part of the PRECAUTIONS section.

Precautions for Deconex DM Capsule

Do not exceed recommended dosage.

Do not use this product

Ask a doctor before use if you have

Stop use and ask a doctor if

  • nervousness, dizziness, or sleeplessness occur
  • cough, or nasal congestion persists for more than 1 week, tends to recur, or is accompanied by a fever, rash, or persistent headache. A persistent cough may be a sign of a serious condition.
  • new symptoms occur

If pregnant or breast feeding, ask a health professional before use.
Keep out of reach of children. In case of overdose, get medical help or contact a Poison Control
Center right away.

Overdose Information for Deconex DM Capsule

No information provided.

Contraindications for Deconex DM Capsule

No information provided.

Clinical Pharmacology for Deconex DM Capsule

No information provided.

Patient Information for Deconex DM Capsule

Do not exceed recommended dosage.

Do not use this product

  • if you are now taking a prescription monoamine oxidase inhibitor (MAOI) (certain drugs for depression, psychiatric, or emotional conditions, or Parkinson's disease), or for 2 weeks after stopping the MAOI drug. If you do not know if your prescription drug contains an MAOI, ask a doctor or pharmacist before taking this product.

Ask a doctor before use if you have

  • a cough that last or is chronic such as occurs with smoking, asthma, chronic bronchitis, or emphysema
  • a cough that occurs with too much phlegm (mucus)
  • heart disease
  • high blood pressure
  • thyroid disease
  • diabetes
  • trouble urinating due to an enlarged prostate gland

Stop use and ask a doctor if

  • nervousness, dizziness, or sleeplessness occur
  • cough, or nasal congestion persists for more than 1 week, tends to recur, or is accompanied by a fever, rash, or persistent headache. A persistent cough may be a sign of a serious condition.
  • new symptoms occur

If pregnant or breast feeding, ask a health professional before use.
Keep out of reach of children. In case of overdose, get medical help or contact a Poison Control
Center right away.

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Report Problems to the Food and Drug Administration

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.