Codeine 15mg Tablets: Moderate Pain, Cough & Diarrhoea UK Guide

Codeine 15mg Tablets contain 15mg of Codeine Phosphate, an opioid medicine with analgesic, antitussive and antidiarrhoeal properties. Codeine may be prescribed for acute moderate pain when other analgesics such as paracetamol or ibuprofen alone have not provided adequate relief, and certain authorised formulations also include indications for dry or painful cough and symptomatic treatment of diarrhoea.

For adults prescribed Codeine 15mg, the appropriate dose depends on the condition being treated, symptom severity, age, individual response and other medicines being taken. Codeine should generally be used at the lowest effective dose for the shortest appropriate duration because repeated or prolonged use can cause tolerance, dependence, addiction and withdrawal symptoms. For acute pain, UK product information recommends limiting treatment to 3 days if adequate pain relief is not achieved.

1. Active Ingredient & Mechanism of Action

Codeine 15mg Active Ingredient

• Codeine Phosphate 15mg: Each tablet contains 15mg of codeine phosphate, an opioid analgesic that can also have antitussive and antidiarrhoeal effects.
• Opioid Medicine: Codeine is converted partly into morphine in the body, contributing to its analgesic effects. Individual response can vary because codeine metabolism differs between people.
• Oral Treatment: Codeine phosphate 15mg is supplied as an oral tablet and is available as a prescription-only medicine in the UK.

How Does Codeine Work?

Codeine produces its principal analgesic effects through opioid receptors after metabolism to morphine. This reduces the perception and emotional response to pain. Codeine can also suppress the cough reflex and reduce intestinal motility, which explains its antitussive and antidiarrhoeal properties.

Codeine & Moderate Pain

Codeine is indicated for acute moderate pain in patients over 12 years when the pain is not considered to be adequately relieved by other analgesics such as paracetamol or ibuprofen alone. Its opioid activity means that treatment requires careful consideration of dependence, sedation, constipation and respiratory-depression risks.

2. Clinical Indications: Who Are These Tablets For?

Codeine for Acute Moderate Pain

• Moderate Pain: Codeine may be prescribed for acute moderate pain when other suitable analgesics alone have not provided sufficient relief.
• Short-Term Treatment: Acute pain treatment should be kept as short as clinically appropriate to reduce opioid-related risks.
• Patients Over 12: UK product information permits use for acute moderate pain in patients older than 12 years, subject to the relevant prescribing restrictions and individual assessment.

Codeine for Cough & Diarrhoea

• Dry or Painful Cough: Some UK-authorised codeine phosphate 15mg products include an indication for the symptomatic treatment of dry or painful cough.
• Diarrhoea: Certain authorised codeine phosphate formulations include codeine for the symptomatic treatment of diarrhoea.
• Clinical Assessment: Treatment should be based on the specific indication and product licence because authorised indications can differ between individual codeine products.

Prescription & Clinical Assessment

• Professional Supervision: Codeine phosphate 15mg tablets are prescription-only medicines in the UK.
• Individualised Treatment: The appropriate dose depends on the condition, age, response, other medicines and relevant medical conditions.
• Regular Monitoring: Continued or repeated use should be reviewed because codeine can cause tolerance, dependence, addiction and withdrawal.

3. Key Benefits of Codeine 15mg

Opioid Pain Relief

• Analgesic Action: Codeine can provide additional pain relief when clinically appropriate for acute moderate pain.
• Combination Therapy: Codeine may also be prescribed in combination with another analgesic, such as paracetamol, when clinically appropriate.

Antitussive Properties

• Cough Suppression: Codeine has antitussive properties and some authorised formulations are indicated for dry or painful cough.
• Symptomatic Relief: Treatment focuses on reducing troublesome cough symptoms rather than treating the underlying cause.

Established 15mg Strength

• 15mg Formulation: Codeine phosphate 15mg tablets are an established UK oral prescription formulation.
• Flexible Prescribing: The prescribed dose and frequency depend on the indication and individual clinical circumstances.

Short-Term Opioid Treatment

• Lowest Effective Dose: UK prescribing information recommends using codeine at the lowest effective dose for the shortest appropriate period.
• Treatment Review: For acute pain, if effective relief is not achieved within the recommended short treatment period, medical advice should be sought rather than continuing treatment independently.

4. Recommended Dosage & Administration Protocol

Codeine 15mg Dosage

• Pain: Adult analgesic dosing varies between products; some UK 15mg product information specifies 30–60mg every 4 hours when required, rather than 15mg being the standard adult analgesic dose.
• Maximum Daily Dose: Where used as an analgesic, the cited UK product information specifies a maximum of 240mg of codeine per day.
• Cough: Certain authorised 15mg products specify 15–30mg three or four times daily for adults when used as an antitussive.
• Dose Intervals: Doses should be separated according to the prescribing instructions; one current UK product specifies intervals of at least 6 hours for its acute-pain regimen.
• Older Adults: Lower doses may be required in older patients, particularly where hepatic or renal function is impaired.

How to Take Codeine

• Oral Administration: Take codeine tablets by mouth exactly as prescribed by your doctor or pharmacist.
• Follow the Prescription: Do not increase the dose or frequency because the medicine appears less effective.
• Avoid Alcohol: Alcohol can increase opioid-related sedation and other central nervous system effects.
• Other Painkillers: Check with a pharmacist or doctor before combining codeine with other medicines, particularly products that also contain paracetamol or other sedatives.
• Missed Dose: If you forget a dose, follow your medicine’s patient leaflet or pharmacist’s instructions and do not take an extra dose to compensate.

Codeine Treatment Duration

• Acute Pain: For acute pain, treatment should generally be limited to a short period; one current UK product specifies 3 days when adequate relief has not been achieved.
• Lowest Effective Dose: Use the lowest dose that provides appropriate symptom control.
• Repeated Treatment: Repeated or prolonged use increases the risk of tolerance, dependence and addiction.
• Gradual Reduction: After prolonged use, codeine should generally be reduced gradually rather than stopped suddenly to minimise withdrawal symptoms.
• Clinical Review: Persistent pain, cough or diarrhoea requires medical assessment rather than prolonged self-directed opioid treatment.

5. Safety Profile, Side Effects & Warnings

Common Codeine Side Effects

• Drowsiness: Codeine can cause sleepiness and reduced alertness, particularly when treatment begins or doses are increased.
• Constipation: Constipation is a common opioid-related adverse effect and may require appropriate management.
• Nausea: Nausea and vomiting can occur, especially during initial treatment.
• Dizziness: Dizziness or light-headedness may affect normal activities.
• Sedation: Codeine can impair concentration and coordination, particularly when combined with alcohol or other sedating medicines.

Codeine Drug Interactions

• Alcohol: Alcohol can increase sedation and other central nervous system effects and should be avoided.
• Benzodiazepines: Combining codeine with benzodiazepines can substantially increase the risk of sedation and respiratory depression.
• Other Opioids: Combining codeine with other opioids can increase opioid-related adverse effects and overdose risk.
• CNS Depressants: Sedating antihistamines, sleeping medicines, anaesthetics and other CNS depressants may intensify codeine’s effects.
• Other Medicines: Tell your doctor or pharmacist about all medicines, including prescription, over-the-counter and herbal products, before using codeine.

Dependence, Withdrawal & Discontinuation

• Dependence Risk: Codeine is an opioid that can cause addiction and dependence, particularly with repeated or prolonged use.
• Tolerance: Repeated use can lead to tolerance, meaning that higher doses may appear necessary to produce the same effect.
• Withdrawal Symptoms: Stopping suddenly after prolonged use can cause anxiety, restlessness, sweating, sleep disturbance, nausea and other withdrawal symptoms.
• Misuse Risk: Taking codeine more frequently or at higher doses than prescribed increases the risk of addiction and overdose.
• Gradual Reduction: Where treatment has been prolonged, discontinuation should generally be planned with a healthcare professional rather than stopping suddenly.

Driving & Machinery

• Drowsiness: Codeine may cause sleepiness and reduce alertness.
• Coordination: Dizziness, sedation or impaired concentration can make driving or machinery operation unsafe.
• Driving Restrictions: Do not drive or operate machinery if codeine affects your alertness, concentration or coordination.

Serious Reactions & Safety Warnings

• Respiratory Depression: Slow, shallow or difficult breathing is a medical emergency and can occur with excessive opioid exposure or combinations with other CNS depressants.
• Severe Sedation: Extreme sleepiness, difficulty waking or loss of consciousness requires urgent medical attention.
• Serious Allergy: Swelling of the face or throat, breathing difficulty or severe allergic reactions require immediate medical treatment.
• Overdose: Excessive codeine can cause severe respiratory depression, unconsciousness and potentially fatal outcomes.
• Dependence & Addiction: Codeine can cause addiction and physical dependence, particularly when used repeatedly or for prolonged periods.
• Ultra-Rapid Metabolism: Some people metabolise codeine into morphine more rapidly than expected, potentially increasing opioid toxicity; this is particularly important in children and breastfeeding. Codeine is contraindicated for children under 12 and should not be used for pain relief in children under 18 following certain surgeries involving the tonsils or adenoids.