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Phenergan-Codeine

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Phenergan-Codeine

Discontinued Warning IconPlease Note: This Brand Name drug is no longer available in the US.
(Generic versions may still be available.)

Phenergan-Codeine
(promethazine HCl and codeine phosphate) Oral Solution




WARNING

Respiratory Depression in Children and Death Related to Ultra-Rapid Metabolism of Codeine to Morphine

Respiratory Depression in Children

The combination of promethazine hydrochloride and codeine phosphate is contraindicated in pediatric patients less than 6 years of age. Concomitant administration of promethazine products with other respiratory depressants has an association with respiratory depression, and sometimes death, in pediatric patients.

Postmarketing cases of respiratory depression, including fatalities, have been reported with use of promethazine hydrochloride in pediatric patients less than 2 years of age. A wide range of weight-based doses of promethazine hydrochloride have resulted in respiratory depression in these patients.

Death Related to Ultra-Rapid Metabolism of Codeine to Morphine

Respiratory depression and death have occurred in children who received codeine following tonsillectomy and/or adenoidectomy and had evidence of being ultra-rapid metabolizers of codeine due to a CYP2D6 polymorphism.

DRUG DESCRIPTION

Each 5 mL (one teaspoonful), for oral administration contains: Promethazine hydrochloride 6.25 mg; codeine phosphate 10 mg in a flavored syrup base with a pH between 4.8 and 5.4. Alcohol 7%.

Inactive ingredients: Artificial and natural flavors, citric acid, D&C Red 33, FD&C Blue 1, FD&C Yellow 6, glycerin, saccharin sodium, sodium benzoate, sodium citrate, sodium propionate, water, and other ingredients.

Codeine is one of the naturally occurring phenanthrene alkaloids of opium derived from the opium poppy, it is classified pharmacologically as a narcotic analgesic. Codeine phosphate may be chemically designated as 7,8-Didehydro-4, 5α-epoxy-3-methoxy-17-methylmorphinan-6-α-ol phosphate (1:1)(salt)hemihydrate.

The phosphate salt of codeine occurs as white, needle-shaped crystals or white crystalline powder. Codeine phosphate is freely soluble in water and slightly soluble in alcohol. It has a molecular weight of 406.37, a molecular formula of C18H21NO3•H3PO4 • ½ H2O, and the following structural formula:

Codeine Phosphate - Structural Formula Illustration

Promethazine hydrochloride, a phenothiazine derivative, is chemically designated as (±)-10-[2(Dimethylamino)propyl] phenothiazine monohydrochloride.

Promethazine hydrochloride occurs as a white to faint yellow, practically odorless, crystalline powder which slowly oxidizes and turns blue on prolonged exposure to air. It is freely soluble in water and soluble in alcohol. It is soluble in water and freely soluble in alcohol. It has a molecular weight of 320.88, a molecular formula of C17H20N2S•HCl, and the following structural formula:

Promethazine HCl - Structural Formula Illustration

What are the possible side effects of codeine and promethazine (Codeine Phosphate-Promethazine HCl, Promethazine HCl and Codeine Phosphate, Promethazine with Codeine)?

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

Call your doctor at once if you have a serious side effect such as:

  • restless muscle movements in your eyes, tongue, jaw, or neck, tremor (uncontrolled shaking);
  • shallow breathing, slow heartbeat;
  • feeling like you might pass out;
  • jaundice (yellowing of the skin or...

Read All Potential Side Effects and See Pictures of Phenergan-Codeine »

What are the precautions when taking codeine phosphate and promethazine hcl (Phenergan-Codeine)?

See also Warning section.

Before taking this medication, tell your doctor or pharmacist if you are allergic to any of its ingredients; or to narcotic pain relievers (e.g., morphine); or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

Before using this medication, tell your doctor or pharmacist your medical history, especially of: abdominal problems (e.g., chronic constipation, ileus, pancreatitis), gallbladder disease, adrenal gland problem (e.g., Addison's disease), blood/immune system problems (e.g., bone marrow depression), brain disorders (e.g., seizures, head injury, tumor, increased intracranial pressure), breathing problems (e.g., asthma,...

Read All Potential Precautions of Phenergan-Codeine »

Last reviewed on RxList: 2/26/2015
This monograph has been modified to include the generic and brand name in many instances.

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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.


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