Codeine – Mild Opioid Analgesic & Antitussive (Rx / Controlled in Many Regions)
Codeine is a mild opioid analgesic and antitussive (cough suppressant) used for the treatment of mild to moderate pain and dry cough when other non-opioid options are not sufficient.
After administration, codeine is partially converted in the liver into morphine (via CYP2D6 enzyme), which provides its pain-relieving effect. Because of this conversion, response to codeine can vary significantly between individuals.
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Key Details
- Active Ingredient: Codeine phosphate (commonly)
- Drug Class: Weak opioid analgesic
- Indications:
- Mild to moderate pain
- Dry, non-productive cough
- Mechanism of Action: Prodrug → partial conversion to morphine → μ-opioid receptor activation
- Prescription Status: Controlled prescription medicine in many countries
Specifications
- Dosage Forms: Tablets, capsules, oral syrup
- Common Strengths: 15 mg, 30 mg, 60 mg (varies by country/formulation)
- Onset of Action: ~30–60 minutes
- Duration of Action: ~4–6 hours
- Half-Life: ~3–4 hours
- Metabolism: Hepatic (CYP2D6 → morphine, CYP3A4 pathways)
- Excretion: Renal
- Storage: Room temperature
Dosage & Administration
- Usually taken every 4–6 hours as needed
- Often combined with paracetamol (acetaminophen) for stronger analgesic effect
- Dose must be individualized by a healthcare provider
- Use is generally recommended for short-term treatment only
Compatibility / Suitable Use
- Patients with mild to moderate pain not controlled by non-opioids
- Treatment of dry cough (in some formulations)
- Short-term pain management under medical supervision
- Not typically used for long-term chronic pain due to dependence risk
Warnings & Precautions
- Risk of dependence, tolerance, and misuse
- Can cause respiratory depression at high doses or in sensitive individuals
- Effectiveness varies due to genetic differences in metabolism (CYP2D6 variability)
- Avoid alcohol and sedatives due to increased CNS depression
- Use caution in children, elderly, and respiratory disease
Contraindications
- Severe respiratory depression
- Acute asthma without monitoring
- Known hypersensitivity to opioids
- Children in certain age groups (restricted in many countries)
- Use with MAO inhibitors (in some cases)
Why Codeine Is Used
Codeine is used as a step-up mild opioid option when standard pain relievers are insufficient, and also as a cough suppressant in selected cases. It is generally reserved for short-term use under medical supervision due to its opioid properties.