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Pregabalin and co-codamol are medicines that may be prescribed for different types of pain. Pregabalin is commonly used for nerve pain, while co-codamol combines codeine, an opioid painkiller, with paracetamol. Although both medicines can have a role in pain management, taking them together requires particular care.
The main concern is that pregabalin and codeine can both affect the central nervous system. When used together, their effects can increase the risk of excessive drowsiness, dizziness and potentially dangerous breathing difficulties. In severe cases, the interaction may lead to unconsciousness, coma or death. UK medicine safety guidance specifically warns about the risks of combining pregabalin with opioid medicines such as codeine.
This guide explains how pregabalin and co-codamol work, why their combination needs medical supervision, which side effects to recognise and what to discuss with a doctor or pharmacist.
What Is Pregabalin?
Pregabalin is a prescription medicine used for conditions including nerve pain and certain types of epilepsy. It is also prescribed for generalised anxiety disorder in some circumstances.
Nerve pain can feel like burning, shooting, tingling or electric-shock sensations. Pregabalin helps reduce abnormal nerve signalling associated with these symptoms.
Common side effects include:
- Sleepiness or drowsiness
- Dizziness
- Headaches
- Blurred vision
- Difficulty concentrating
- Swelling in the hands or feet
- Weight gain in some people
Pregabalin can also cause serious side effects in certain circumstances, including breathing difficulties. The risk may be higher for people with respiratory problems, kidney impairment, neurological conditions or those taking other medicines that cause sedation.
Pregabalin should be taken according to the prescription. Do not increase the amount, share it with another person or stop taking it suddenly without medical advice.
For more information, read our related guide: Pregabalin 300mg: What Patients Should Know.
What Is Co-codamol?
Co-codamol is a combination painkiller containing two active ingredients:
- Codeine: An opioid painkiller that changes how the body perceives pain.
- Paracetamol: A pain-relieving medicine that can help reduce pain and fever.
Co-codamol is used for certain types of pain when a healthcare professional considers the combination appropriate. It is available in different strengths, and the prescribed product determines how much codeine and paracetamol each tablet contains.
Possible side effects include:
- Constipation
- Nausea or vomiting
- Drowsiness
- Dizziness
- Stomach discomfort
Codeine can cause dependence and slow breathing. Paracetamol can cause serious liver damage if too much is taken, including through accidental duplication with other medicines.
Important: Do not take additional paracetamol-containing products alongside co-codamol unless a healthcare professional has confirmed that it is appropriate. Check the ingredients of other painkillers and cold or flu remedies carefully.
Can You Take Pregabalin and Co-codamol Together?
Pregabalin and co-codamol should only be taken together when a qualified prescriber has assessed the risks and specifically advised that the combination is appropriate.
The concern comes mainly from the combined effects of pregabalin and codeine. Both can cause drowsiness and affect the central nervous system. Using them together may increase sedation and suppress breathing.
UK product information warns that combining co-codamol with pregabalin can lead to respiratory depression, low blood pressure, profound sedation, coma or death. The level of risk varies between individuals and depends on factors such as other medicines, health conditions and the prescribed treatment.
A doctor may sometimes decide that both medicines are necessary. If so, the prescriber should consider the potential benefits and risks, review other medicines and provide appropriate monitoring or adjustments where necessary.
Do not start this combination independently, use someone else’s prescription or alter the timing or amount of either medicine in an attempt to make the combination safer.
Why Is the Combination Potentially Dangerous?
1. Increased Drowsiness and Sedation
Pregabalin can cause sleepiness, while codeine can also make people feel drowsy or less alert.
When these medicines are used together, the combined effect may be stronger than expected. A person may feel unusually sleepy, confused, dizzy or unsteady.
Severe sedation can make it difficult to wake someone and may occur alongside breathing problems.
Avoid driving, cycling or operating machinery if you feel sleepy, dizzy or impaired. Alcohol and other sedating medicines can increase these risks further.
2. Respiratory Depression
Respiratory depression means that breathing becomes abnormally slow or shallow. It is one of the most serious concerns when pregabalin is combined with an opioid such as codeine.
Signs of a possible emergency include:
- Slow, shallow, irregular or difficult breathing
- Extreme sleepiness or difficulty waking
- Blue or grey lips or fingertips
- Collapse or loss of consciousness
- Severe confusion accompanied by unusual drowsiness
The UK’s Medicines and Healthcare products Regulatory Agency (MHRA) has warned that pregabalin has been associated with severe respiratory depression, including in some cases where no opioid was being taken. People with certain health conditions or taking other central nervous system depressants may be at greater risk.
3. Dizziness, Poor Coordination and Falls
Both medicines can affect alertness and balance. Their combined effects may increase the likelihood of stumbling, falling or sustaining an injury.
This is particularly important for older adults and people who already experience dizziness, weakness or mobility difficulties.
Take care when standing up or walking if you feel light-headed. Tell your doctor or pharmacist if dizziness becomes persistent or significantly affects everyday activities.
4. Constipation and Digestive Problems
Codeine commonly causes constipation. Opioids can also slow bowel movement, and combining them with pregabalin may require additional attention to digestive symptoms.
Seek advice if constipation persists or becomes difficult to manage. Severe abdominal pain, a swollen abdomen or persistent vomiting needs prompt medical assessment.
5. Low Blood Pressure and Fainting
The combination can sometimes contribute to low blood pressure. This may cause light-headedness, weakness or fainting, particularly in vulnerable individuals or when other medicines also lower blood pressure.
Seek medical advice if these symptoms occur. Fainting accompanied by severe drowsiness, breathing problems or difficulty waking someone requires emergency help.
Who May Have a Higher Risk of Side Effects?
All three medicines can cause side effects, and some overlap.
Constipation
The combination needs particular caution in people who:
- Are aged over 65 or are frail
- Have asthma, chronic lung disease or another condition affecting breathing
- Have kidney problems, which may affect how pregabalin is cleared from the body
- Have neurological conditions that affect breathing or alertness
- Take sleeping tablets, benzodiazepines or other sedating medicines
- Drink alcohol while taking these medicines
- Have a history of medicine dependence or substance misuse
These factors do not automatically determine whether treatment is suitable, but they are important for a prescriber to consider.
Tell your doctor or pharmacist about all medicines you use, including prescribed medicines, pharmacy products, herbal remedies and supplements.
Medicines and Substances to Discuss With Your Doctor
Pregabalin and co-codamol may interact with other substances that cause sedation or affect breathing.
Alcohol
Alcohol can increase drowsiness and may worsen breathing-related risks. Avoid alcohol while taking this combination unless your healthcare professional has given specific advice.
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Medicines such as benzodiazepines and other sedatives can increase central nervous system depression when combined with opioids. Taking them with pregabalin and co-codamol may increase the risk of severe sedation and breathing difficulties.
Other Opioid Painkillers
Do not add codeine, dihydrocodeine, tramadol, morphine or another opioid painkiller unless your prescriber has specifically directed you to do so. Combining opioid medicines can increase the risk of overdose and respiratory depression.
Other Paracetamol Products
Co-codamol already contains paracetamol. Taking additional paracetamol through another painkiller or cold and flu remedy can lead to an accidental overdose and serious liver damage.
Read the labels of all medicines and ask a pharmacist if you are unsure about their ingredients.
What Should You Do If Both Medicines Have Been Prescribed?
If your doctor has prescribed pregabalin and co-codamol together, follow the treatment instructions you were given.
Useful precautions include:
- Follow the prescription exactly. Do not take extra doses or change the amount yourself.
- Check before adding another medicine. Ask a pharmacist about potential interactions.
- Avoid alcohol. It can increase sedation and breathing risks.
- Monitor for unusual symptoms. Report new or worsening drowsiness, dizziness or breathing changes.
- Discuss your medical history. Make sure your prescriber knows about breathing problems, kidney conditions and other medicines you take.
- Keep medicines secure. Store them away from children and anyone for whom they were not prescribed.
Should You Stop Taking Pregabalin or Co-codamol?
Do not stop prescribed treatment suddenly or make changes without medical advice.
Pregabalin may cause withdrawal symptoms if it is stopped abruptly, and a gradual reduction may be needed. Suddenly stopping or changing regular opioid treatment can also cause problems, including withdrawal symptoms.
If you are concerned about the interaction, contact your prescriber promptly. They can assess your circumstances and advise whether the treatment needs to be adjusted, changed or stopped gradually.
If you experience serious breathing difficulties, collapse or extreme difficulty staying awake, seek emergency help rather than waiting for a routine appointment.
Frequently Asked Questions
Is it safe to take pregabalin and co-codamol at the same time?
The combination can increase the risk of serious side effects, including sedation and respiratory depression. It should only be used when a prescriber has specifically assessed and approved the combination.
What is the main risk of combining pregabalin with co-codamol?
The main concern is that pregabalin and codeine can have additive effects on the central nervous system. This can cause excessive drowsiness and dangerously slow breathing, potentially leading to unconsciousness or death.
Can pregabalin and co-codamol make you sleepy?
Yes. Both medicines can cause drowsiness, and their effects may be stronger when they are taken together. Avoid driving or operating machinery if you feel impaired.
Can I drink alcohol while taking pregabalin and co-codamol?
Alcohol can increase sedation and the risk of breathing problems. Avoid alcohol while taking this combination and ask your prescriber or pharmacist if you need advice about your specific treatment.
Can I take another painkiller with co-codamol?
Do not add another painkiller without checking its ingredients and asking a pharmacist or prescriber. In particular, avoid accidentally doubling up on paracetamol or combining opioid painkillers without medical direction.
Conclusion
Pregabalin and co-codamol may sometimes be prescribed together, but their combination carries important safety risks. Because pregabalin and codeine can both affect the central nervous system, using them together may increase the risk of drowsiness, dizziness, low blood pressure and potentially life-threatening breathing difficulties.
The safest approach is to use the combination only under appropriate medical supervision, avoid alcohol, check all other medicines for interactions and seek advice if symptoms develop. Never change your prescribed treatment or add another opioid painkiller without professional guidance.
If you are unsure whether pregabalin and co-codamol are appropriate for you, speak with your doctor or pharmacist. For severe breathing difficulties, collapse or suspected overdose, Contact Doctor.
Medical disclaimer: This article is for general educational purposes only and is not a substitute for individual medical advice, diagnosis or treatment. Always follow your prescription and the patient information leaflet supplied with your medicine.
