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Dihydrocodeine, codeine and tramadol are medicines used to relieve certain types of pain. Although they belong to the opioid group of medicines, they are not identical. They differ in how they work, their potential side effects and the precautions needed when using them.
These medicines may be prescribed when a healthcare professional considers an opioid appropriate for a person’s pain. However, they can also cause drowsiness, constipation, dependence and potentially life-threatening breathing problems, particularly when taken incorrectly or combined with certain other substances.
Understanding the differences between dihydrocodeine, codeine and tramadol can help patients have more informed conversations with their doctor or pharmacist.
This guide explains what each medicine is used for, how they differ, the risks to understand and the precautions that matter when taking opioid painkillers in the UK.
Medical disclaimer: This article provides general educational information and is not a substitute for medical advice. Always follow your prescription and the patient information leaflet supplied with your medicine.
What Are Dihydrocodeine, Codeine and Tramadol?
All three medicines belong to a group called opioids. Opioids act on receptors involved in pain signalling in the nervous system, helping reduce how strongly pain is experienced.
However, they have different pharmacological properties, and their effects can vary between individuals.
What is dihydrocodeine?
Dihydrocodeine is an opioid painkiller used to treat pain when a healthcare professional considers it appropriate.
It is available in different formulations, and the suitable preparation depends on the individual’s clinical circumstances and prescription.
Common side effects include constipation, nausea, vomiting, drowsiness and dry mouth.
Dihydrocodeine can cause dependence, and long-term use requires appropriate medical supervision.
Read our detailed guide: Dihydrocodeine 30mg: What Patients Should Know.
What is codeine?
Codeine is an opioid medicine used to treat certain types of pain. It is also present in some combination painkillers, including co-codamol, which contains codeine and paracetamol.
The way a person responds to codeine can vary because the body converts some codeine into morphine. Differences in metabolism can affect both pain relief and the risk of side effects.
Common side effects include constipation, nausea, sweating and feeling sleepy or tired.
Codeine can cause dependence, particularly with prolonged use.
Read our detailed guide: Codeine Phosphate 30mg and 60mg: What Patients Should Know.
What is tramadol?
Tramadol is an opioid painkiller used for moderate to severe pain when a healthcare professional considers it appropriate.
In addition to its action on opioid receptors, tramadol affects the brain’s noradrenaline and serotonin signalling systems. These additional effects mean it has some risks that require particular attention.
Possible side effects include nausea, dizziness, constipation, drowsiness and headache. Tramadol can also increase the risk of seizures and serotonin syndrome in certain circumstances, particularly with specific medicines or other risk factors.
Like other opioids, tramadol can cause dependence and withdrawal symptoms.
Read our detailed guide: Tramadol 50mg: What Patients Should Know.
Dihydrocodeine vs Codeine vs Tramadol: Key Differences
The following table summarises some important distinctions.
| Feature | Dihydrocodeine | Codeine | Tramadol |
|---|---|---|---|
| Medicine group | Opioid | Opioid | Opioid with additional effects on serotonin and noradrenaline signalling |
| Main use | Relief of certain types of pain | Relief of certain types of pain | Relief of moderate to severe pain in appropriate circumstances |
| Common side effects | Constipation, nausea, drowsiness | Constipation, nausea, sleepiness | Nausea, dizziness, constipation, drowsiness |
| Dependence risk | Yes | Yes | Yes |
| Important additional concern | Sedation and slowed breathing | Variable conversion to morphine | Seizures and serotonin syndrome in susceptible circumstances |
| UK use | Follow the relevant prescription and product instructions | Depends on the formulation and product; follow professional advice | Prescription medicine; follow the prescribed instructions |
Important: This table does not establish which medicine is strongest or safest for an individual. Opioid potency, formulation, dose, medical history and other medicines all matter. These medicines should not be swapped or combined without advice from a qualified healthcare professional.
How Do These Medicines Work?
Although the three medicines are related, there are differences in their actions.
Dihydrocodeine and pain signalling
Dihydrocodeine acts on opioid receptors to reduce the perception of pain. The degree of relief varies according to the type of pain, the formulation and the individual response.
Codeine and its conversion in the body
Codeine is partly converted into morphine by an enzyme called CYP2D6. People differ in how efficiently this happens, which can influence both effectiveness and the risk of harmful effects.
Some people may obtain limited pain relief, while others may produce morphine more rapidly and face a greater risk of toxicity.
Tramadol’s additional effects
Tramadol acts on opioid receptors and also influences serotonin and noradrenaline signalling. These additional actions are relevant when considering interactions with antidepressants and other medicines.
These differences are one reason a medicine that suits one person may not be appropriate for another.
What Are the Common Side Effects?
All three medicines can cause side effects, and some overlap.
Constipation
Opioids can slow movement in the digestive system, making bowel movements less frequent or more difficult.
Speak to your pharmacist or prescriber if constipation becomes troublesome or does not improve.
Nausea and vomiting
Some people experience nausea or vomiting when taking opioid medicines. Seek advice if symptoms persist or prevent you from keeping fluids down.
Drowsiness and dizziness
These medicines can cause sleepiness, dizziness or impaired concentration.
Do not drive, cycle or operate machinery if you feel sleepy, dizzy or otherwise impaired.
Dry mouth and sweating
Dry mouth and sweating can occur with some opioid medicines. If symptoms are persistent or troublesome, ask your pharmacist or prescriber for advice.
Not everyone experiences the same side effects, and their severity can vary.
Important Safety Risks to Understand
1. Dependence and addiction
All three medicines can cause dependence. With prolonged use, the body may adapt to an opioid, and a person may experience withdrawal symptoms if treatment is stopped suddenly.
Dependence can occur even when a medicine has been taken as prescribed. Addiction is a related but distinct condition involving patterns of use that can become difficult to control.
Warning signs can include:
- Feeling that you need more medicine than prescribed.
- Experiencing cravings.
- Taking the medicine for reasons other than its intended purpose.
- Feeling unable to reduce or stop its use.
- Experiencing withdrawal symptoms when a dose is missed or treatment stops.
If you recognise these signs, speak to your prescriber or pharmacist. Do not increase the dose yourself.
The UK’s Medicines and Healthcare products Regulatory Agency (MHRA) warns that prolonged opioid use can increase the risk of dependence and addiction.
2. Respiratory depression
Respiratory depression means breathing becomes dangerously slow or shallow. It is one of the most serious risks associated with opioids.
The risk may be higher when opioids are combined with alcohol, sleeping tablets, benzodiazepines or other medicines that cause sedation.
Seek emergency help if someone taking an opioid becomes difficult to wake, develops slow or abnormal breathing, or becomes unresponsive.
3. Drug interactions
All three medicines can interact with other substances, but the specific interactions differ.
Examples include:
- Alcohol: Can increase drowsiness and other dangerous opioid effects.
- Benzodiazepines and sleeping tablets: Can increase sedation and breathing risks.
- Other opioids: Combining opioid medicines can increase the risk of overdose.
- Certain antidepressants: These can increase the risk of serotonin syndrome with tramadol.
- Some medicines that affect seizure risk: These may increase concerns when used with tramadol.
Always tell your doctor or pharmacist about prescription medicines, over-the-counter products, supplements and alcohol use when discussing treatment.
4. Tramadol and seizure risk
Tramadol can increase the risk of seizures in some circumstances. The risk may be affected by medical history, dose and other medicines that lower the seizure threshold.
If you have a history of seizures or take medicines that may interact with tramadol, make sure your prescriber knows before treatment begins.
5. Withdrawal symptoms
Stopping an opioid suddenly after prolonged use can cause withdrawal symptoms.
These may include sweating, restlessness, anxiety, difficulty sleeping, diarrhoea, nausea, vomiting and body aches.
If you have been taking an opioid regularly for a prolonged period, ask your prescriber how to stop safely. A gradual reduction may be needed.
Do not attempt to manage withdrawal by taking extra opioid medicine or adding another opioid yourself.
Can You Take Dihydrocodeine, Codeine and Tramadol Together?
Do not combine these medicines unless a qualified healthcare professional has specifically instructed you to do so.
Taking more than one opioid can increase the risk of excessive sedation, breathing problems and overdose.
Also check combination products carefully. For example, co-codamol already contains codeine alongside paracetamol. Taking additional codeine-containing medicine or another opioid without professional advice may increase the risk of harm.
If your pain is not adequately controlled, contact your prescriber or pharmacist rather than adding another painkiller yourself.
Which Medicine Is Right for You?
There is no single answer that applies to everyone.
A healthcare professional considers several factors before recommending an opioid, including:
- The type and severity of pain.
- The likely cause and expected duration of the pain.
- Previous treatments and their effectiveness.
- Other medicines you take.
- Your medical history.
- Your risk of side effects, interactions and dependence.
- Whether non-opioid treatments may be suitable.
One medicine should not be considered automatically better than another simply because it has a different name or strength.
If your treatment is not helping, discuss your symptoms and concerns with your prescriber. Do not change your dose, switch medicines or combine products without professional advice.
How to Use Prescribed Opioids More Safely
If you have been prescribed dihydrocodeine, codeine or tramadol, follow these general precautions:
- Take the medicine exactly as instructed by your prescriber.
- Never increase the dose or take extra doses without advice.
- Avoid alcohol unless your healthcare professional has confirmed that it is safe.
- Check before taking other medicines that may cause drowsiness.
- Do not drive or operate machinery if you feel impaired.
- Keep medicines out of sight and reach of children.
- Store medicines securely and never share them with anyone else.
- Ask for advice before stopping long-term treatment.
- Return unused medicines to a pharmacy for safe disposal.
Keep the patient information leaflet supplied with your medicine and ask a pharmacist if any instructions are unclear.
When Should You Seek Medical Help?
Speak to your prescriber or pharmacist if you experience persistent side effects, inadequate pain relief, concerns about dependence or difficulty reducing your medicine.
Seek urgent medical assistance for severe or rapidly worsening symptoms.
Frequently Asked Questions
Are dihydrocodeine, codeine and tramadol the same medicine?
No. They are different opioid medicines with different pharmacological properties, side effects and interaction risks. They should not be treated as interchangeable.
Which is stronger: dihydrocodeine, codeine or tramadol?
There is no safe, universal comparison based on the medicine names alone. Effects depend on the formulation, prescribed dose, individual response and other clinical factors. Do not use online comparisons to switch medicines or calculate equivalent doses.
Can these medicines cause addiction?
Yes. All three can cause dependence and addiction. The risk can increase with prolonged use. If you are worried about dependence or withdrawal, speak to your prescriber or pharmacist.
Can I drink alcohol while taking these medicines?
Alcohol can increase drowsiness and other dangerous effects of opioids. It is safest to avoid alcohol unless your prescriber or pharmacist has specifically advised you otherwise.
Can I take another painkiller with an opioid?
Some painkillers may be used alongside an opioid in appropriate circumstances, but the choice depends on the specific medicines and your health. Check with a pharmacist or prescriber before combining treatments, especially if a product already contains codeine or paracetamol.
What should I do if my opioid medicine is not relieving my pain?
Contact your prescriber or pharmacist. Do not increase the dose, take extra medicine or switch to another opioid on your own.
Is it safe to stop taking an opioid suddenly?
If you have been taking an opioid regularly for a prolonged period, stopping suddenly can cause withdrawal symptoms. Ask your prescriber for advice about reducing it safely.
Conclusion
Understanding the differences between dihydrocodeine, codeine and tramadol can help you ask informed questions about pain management and medicine safety.
Although these medicines can be useful when appropriately prescribed, they are not interchangeable and should not be chosen solely on the basis of strength or perceived effectiveness.
Follow your prescription, understand the potential side effects, check for interactions and speak with your healthcare professional if you have concerns about pain relief, dependence or withdrawal.
