Codeine Drug Profile

What is Codeine?

Codeine is an opioid analgesic medication derived from the opium poppy plant that is used to treat mild to moderate pain and suppress cough. It belongs to the class of medications known as opioid analgesics, which work by binding to opioid receptors in the brain and spinal cord. Codeine is often combined with other pain relievers like acetaminophen or ibuprofen to enhance its effectiveness.

Uses

Codeine is prescribed for several medical conditions:

• Mild to moderate pain relief: Used for pain management following dental procedures, minor surgeries, or injuries
• Cough suppression: Effective in treating persistent dry coughs, particularly when other cough medications have failed
• Diarrhea control: Can be used to slow bowel movements in certain cases of chronic diarrhea
• Post-operative pain: Often prescribed for pain management after outpatient surgical procedures
• Chronic pain conditions: Sometimes used as part of a pain management plan for conditions like arthritis when other medications are insufficient

How it works

Codeine works by binding to mu-opioid receptors in the brain and spinal cord, which blocks pain signals from reaching the brain. The medication is converted in the liver to morphine, which is responsible for much of its pain-relieving effect. This conversion process varies significantly between individuals due to genetic differences in liver enzymes, which explains why codeine’s effectiveness can vary greatly from person to person.

Side effects

Common side effects include:

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• Drowsiness and sedation
• Constipation
• Nausea and vomiting
• Dizziness or lightheadedness
• Dry mouth
• Headache
• Loss of appetite
• Sweating

Serious side effects requiring immediate medical attention:

• Severe respiratory depression or difficulty breathing
• Severe allergic reactions with rash, swelling, or difficulty swallowing
• Signs of addiction or dependence
• Severe constipation or bowel obstruction
• Confusion or extreme drowsiness

Warnings and precautions

• Pregnancy and breastfeeding: Codeine is not recommended during pregnancy or breastfeeding as it can cause respiratory depression in newborns and infants
• Children and adolescents: Use is restricted in children under 12 years and contraindicated after tonsillectomy or adenoidectomy due to risk of severe breathing problems
• Respiratory conditions: Should be avoided in patients with asthma, sleep apnea, or other breathing disorders
• Liver and kidney disease: Dosage adjustments may be necessary as these organs are responsible for processing and eliminating the medication
• Addiction potential: Codeine carries risk of physical dependence and addiction, especially with long-term use or in individuals with a history of substance abuse

Interactions

Codeine can interact with numerous medications and substances:

• Central nervous system depressants: Alcohol, benzodiazepines, and sedatives can increase drowsiness and respiratory depression risk
• MAO inhibitors: Can cause dangerous increases in codeine effects and should be avoided within 14 days of MAO inhibitor use
• Warfarin: Codeine may enhance the blood-thinning effects of anticoagulants
• Tricyclic antidepressants: Can increase sedation and potentially affect breathing
• Muscle relaxants: May enhance sedative effects and increase fall risk
• CYP2D6 inhibitors: Medications like fluoxetine or paroxetine can reduce codeine’s effectiveness by blocking its conversion to morphine
• St. John’s Wort: This herbal supplement may reduce codeine’s effectiveness
• Other opioid medications: Combining with other opioids increases risk of serious side effects

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Dosage

Typical adult dosages for codeine vary based on the condition being treated and formulation used. For pain relief, the usual dose ranges from 15-60 mg every 4-6 hours as needed, with a maximum daily dose typically not exceeding 360 mg. For cough suppression, lower doses of 10-20 mg every 4-6 hours are commonly prescribed. When combined with other medications like acetaminophen, the codeine portion is usually 8-60 mg per dose. Dosage should always be individualized and determined by a healthcare provider based on the patient’s medical condition, response to treatment, and risk factors. Elderly patients typically require lower starting doses due to increased sensitivity to opioid effects.

Sources: FDA DailyMed drug labels (public domain), BNF, WHO Essential Medicines List. This article is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider before starting or stopping any medication.

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