Co-codamol combines paracetamol with codeine, an opioid that can cause tolerance, physical dependence and addiction. Taking more than directed can cause life-threatening codeine toxicity or delayed, serious liver damage from paracetamol.
Repeated opioid use does not affect everyone in the same way. Risk depends on the product, dose, duration, other medicines or substances, health conditions and personal circumstances. Dependence and addiction are related but different: physical dependence can occur with prescribed use, while addiction involves impaired control and continued use despite harm.
In the UK, some low-strength combination painkillers containing codeine can be supplied by a pharmacy for short-term pain that is not relieved by paracetamol or ibuprofen alone; higher-strength products require a prescription. Availability without a prescription does not remove the risks of dependence, opioid addiction, breathing suppression or paracetamol overdose.
Co-codamol is the UK name for products that combine paracetamol and codeine. Repeated use can lead to tolerance and physical dependence, and some people develop addiction. Alcohol, benzodiazepines, sedatives and other opioids can add to codeine’s effects and increase the risk of severe drowsiness, breathing problems, coma and death.
Co-codamol is an analgesic medication that is a combination of two drugs namely paracetamol (acetaminophen) and codeine phosphate (an opioid).
Paracetamol also known as acetaminophen is a non-narcotic analgesic and antipyretic. Antipyretics are medications used to treat fever by acting on part of the brain that regulates the body’s temperature. Paracetamol is used as an alternate for NSAIDs in patients with gastric complaints or risks and in those who do not require the anti-inflammatory action of NSAIDs.
Codeine is an opioid analgesic used for some types of moderate pain. It can cause drowsiness, constipation, breathing suppression, tolerance, physical dependence and addiction.
What is co-codamol used to treat?
Co-codamol is used for the short-term treatment of non-malignant pain when other pain medications have not proved to be effective. Co-codamol is used in the following condition:
- headache
- toothache
- muscular pain
- migraine
Co-codamol is a combination of two drugs that work through their separate mechanism of action.
Paracetamol reduces pain and fever, although its exact mechanism is not fully understood. In co-codamol it works alongside codeine; taking extra paracetamol from another product can unintentionally cause an overdose.
Codeine is converted partly to morphine and relieves pain through opioid receptors in the central nervous system. People metabolise codeine at different rates, so effects and risks vary. It can also cause drowsiness, euphoria, tolerance, physical dependence and addiction; taking more than directed increases the risk of dangerous breathing suppression.
Co-codamol strengths in the UK
Co-codamol comes in the form of tablets and capsules in three different strengths. The tablets or capsules contain 8mg, 15mg, and 30mg of codeine.
However, the paracetamol is 500mg in all the preparations, similar to the standard dose of paracetamol.
Moreover, the packaging contains two numbers depicting the strength of both the drugs such as 8/500 refers to 8mg of codeine and 500mg of paracetamol. The labels 15/500 and 30/500 mean 15mg or 30mg of codeine with 500mg of paracetamol in each tablet.
The lowest strength (8/500) is available as an over-the-counter pain medication, while the higher strengths (15/500 and 30/500) are available only on prescription by a general practitioner (GP).
Dosage
Dose instructions differ by strength, formulation, age and individual health. Follow the label and the directions from your prescriber or pharmacist exactly; do not increase the dose, take extra doses or combine co-codamol with any other paracetamol- or codeine-containing product.
Pharmacy-supplied co-codamol is intended for short-term use and should not be taken for more than three days without advice from a doctor or pharmacist. This limit is a safety rule, not a precise “addiction clock”; the risk of dependence and addiction varies and generally increases with higher doses and longer use.
If co-codamol is prescribed, take it only as directed and discuss the planned duration and stopping plan with the prescriber. Never take a double dose. Too much paracetamol can cause delayed, serious liver damage even when a person initially feels well.
Use the product exactly as its leaflet directs. Standard tablets are swallowed whole; effervescent and other formulations have different instructions, so check the pack or ask a pharmacist.
Like every other medicine, certain side effects are associated with co-codamol use. They are as follows:
- drowsiness
- constipation
- nausea
- vomiting
- headache
- confusion
- abdominal pain
- dependency and addiction
Important risks include severe drowsiness or breathing problems from codeine, delayed liver injury from excess paracetamol, and the development of tolerance, physical dependence or addiction. Use only the recommended product and dose, keep it secure, and do not share it with anyone else.
Some serious and less common side effects of co-codamol include:
- change in eyesight
- dizziness
- difficulty in urination
A serious allergic reaction may cause swelling of the lips, mouth, throat or tongue, difficulty breathing, collapse, or a blistering or peeling rash. Stop the medicine and seek emergency help for these symptoms.
Taking too much can cause life-threatening breathing suppression from codeine and serious liver injury from paracetamol. Long-term or repeated use also increases the risks of tolerance, physical dependence and addiction. Seek urgent help for slow or difficult breathing, collapse or inability to wake.
Co-codamol can cause tolerance and physical dependence, and some people develop addiction. Low-strength pharmacy products still contain an opioid and are not risk-free. Alcohol, benzodiazepines, sedatives and other opioids can intensify drowsiness and breathing suppression; follow the product warning and ask a pharmacist or prescriber before combining medicines.
Repeated use can cause physical dependence and withdrawal when the dose is reduced or stopped. The likelihood and severity vary with dose, duration and individual circumstances; the three-day limit for pharmacy products is not a guaranteed threshold. If you have used co-codamol regularly, ask the prescriber how to reduce it safely.
Using codeine with alcohol, benzodiazepines, sedatives, gabapentinoids or other opioids can increase sedation and breathing suppression. Tell the prescriber or pharmacist about every medicine and substance you use so interaction risks can be assessed.
Some people experience euphoria or use co-codamol for reasons other than pain, but addiction is not inevitable. Warning signs include craving, loss of control, taking more or for longer than directed, continued use despite harm, and repeated unsuccessful attempts to cut down. Increasing the dose raises overdose risk.
Co-codamol use does not inevitably lead to heroin use. Anyone concerned about their use deserves a non-judgmental assessment that considers pain, physical dependence, mental health and possible opioid use disorder.
Co-codamol misuse means using it in a way not directed on the label or by a prescriber, such as taking extra doses or using it for effects other than pain relief. Misuse can cause overdose and may be a sign of addiction, but physical dependence alone is not the same as addiction.
Examples of misuse or warning behaviors can include:
- Using co-codamol with alcohol, benzodiazepines, sedatives or other opioids despite safety warnings
- Altering the product or using it by a route not directed on the label
- Taking a higher dose of co-codamol that was not prescribed
- Obtaining co-codamol outside a licensed pharmacy or valid prescription
- Seeking supplies from multiple sources or hiding how much is being used
Possible warning signs of co-codamol addiction or harmful use include changes in control, purpose and consequences of use. One sign alone does not diagnose addiction; a clinician can assess the pattern without judgment:
- Taking larger doses of co-codamol and more frequently
- Taking co-codamol long after the pain has subsided
- Hiding or minimizing how much medicine is being used
- Seeking supplies from multiple pharmacies or prescribers
- Seeking overlapping prescriptions or supplies from multiple clinicians or pharmacies
- Obtaining co-codamol from unregulated or illegal sources
- Experiencing withdrawal symptoms when you stop taking co-codamol
Risks associated with co-codamol misuse
Misuse can harm both physical and mental health. Important risks include:
- Respiratory depression can lead to coma and death
- Co-codamol overdose
- Developing dependence on co-codamol
- Developing addiction on co-codamol
- Accidents or unsafe decisions while drowsy or impaired
- Serious liver injury from paracetamol
- Coma
Addiction can affect health, mood, judgment, relationships and daily responsibilities. Possible signs and effects include:
Some of the physical side effects are as follows:
- slurred speech
- drowsiness
- pinpoint pupils
- loss of appetite
- shallow breathing
- staggering gait
- loss of balance
- experiencing withdrawal symptoms
Behavioral and psychological symptoms are as follows:
- anxiety
- depression
- loss of interest in activities that earlier used to excite them
- isolating themselves
- hiding their tablets
- unexplained mood swings
- agitation
- impaired thinking and judgment
- becoming withdrawn from their responsibilities
- failing academically and/or financially
- declining personal hygiene or grooming
- experiencing insomnia and having nightmares
- preoccupied with thoughts of arranging the drug
Addiction can narrow a person’s focus toward obtaining and using the medicine, while health, relationships and responsibilities suffer. This is a treatable health condition, not a moral failing.
Treatment can include a supported reduction plan, medication for opioid use disorder when clinically appropriate, psychological support, pain review, overdose education and continuing care. The right plan depends on the individual.
There is no single dose at which overdose can be predicted for every person. Never combine co-codamol with another paracetamol- or codeine-containing product. If more than directed may have been taken, seek urgent medical or poison-service advice immediately, even if the person feels well, because serious liver injury can be delayed.
Effects of co-codamol overdose
As co-codamol is a combination of paracetamol and codeine, the effects of overdose are attributed to both the drugs individually.
Paracetamol overdose may cause few or no early symptoms. Do not wait for sweating, vomiting or abdominal pain before seeking help after a possible excess dose.
Serious liver injury can develop after an initially well period. Early hospital assessment allows clinicians to measure risk and give time-sensitive treatment when needed.
Severe paracetamol poisoning can also affect the kidneys, blood clotting, blood sugar and brain. These complications require hospital care.
Codeine overdose can depress the central nervous system, causing extreme drowsiness, muscle weakness, cold or clammy skin, slow or shallow breathing, coma and death.
Codeine alone can cause severe, life-threatening breathing suppression. Alcohol, benzodiazepines and other sedatives increase the risk, but serious poisoning does not require co-use or an obviously very large dose. Seek immediate medical or poison-service advice after taking more co-codamol than directed, even if you feel well. Call emergency services for slow or difficult breathing, collapse or inability to wake.
Other opioid-overdose signs can include extreme drowsiness, confusion, cold or clammy skin, small pupils, seizures and low blood pressure. The most urgent danger is slow, shallow or stopped breathing.
In severe overdose with codeine, circulatory collapse, cardiac arrest and death may occur.
Call emergency services immediately if breathing is slow or difficult, the person has collapsed or cannot be woken. Give naloxone if it is available and you are trained to use it, and stay with the person until help arrives.
After regular use, reducing or stopping co-codamol can produce opioid withdrawal because the body has adapted to codeine. Withdrawal can be uncomfortable and may complicate pain or mental health, so an individualized plan from a prescriber or addiction service is appropriate.
Co-codamol withdrawal symptoms
Physical dependence can occur with prescribed use and is not the same as addiction. Withdrawal may occur after reducing or stopping regular codeine use; onset and severity vary with the dose, duration, formulation and individual circumstances.
Possible co-codamol withdrawal symptoms include:
- diarrhea
- restlessness
- loss of appetite
- shaking
- sweating
- shivering
- nausea
- vomiting
- difficulty sleeping
- palpitations
- increased blood pressure
- agitation
- confusion
- anxiety
- watery eyes
- cravings for co-codamol
There is no fixed withdrawal timeline. Symptoms and recovery vary, and cravings or sleep and mood problems may last longer than the most acute physical symptoms.
If you have used co-codamol regularly, ask the prescriber how to reduce it safely rather than making a sudden change on your own. This does not replace emergency action for overdose or a serious allergic reaction.
A suspected co-codamol overdose requires immediate medical assessment; rehabilitation is not a substitute for emergency care. After stabilization, treatment for addiction should be based on a full assessment and an individualized plan rather than a fixed detox or residential timeline.
Care may include medical and mental-health assessment, supported withdrawal, evidence-based medication for opioid use disorder when appropriate, psychological therapies, pain management, overdose education and relapse-prevention planning. Continuing care should adapt as needs change.
Residential amenities can support comfort and privacy, but clinical suitability, safety, continuity and evidence-based treatment should guide the choice of program.
