Doltrex contains tramadol, an opioid painkiller used for moderate to severe pain when ordinary painkillers are not enough. Doltrex 50 mg contains tramadol alone; Doltrex Co combines a lower dose of tramadol with paracetamol. Both are prescription-only Schedule 5 medicines.
What is Doltrex?
Doltrex is registered in South Africa as Schedule 5 in two forms:
| Product | Contains |
|---|---|
| Doltrex 50 mg | Tramadol hydrochloride 50 mg |
| Doltrex Co 37.5/325 | Tramadol 37.5 mg + paracetamol 325 mg |
Knowing which one you have matters, because Doltrex Co already contains paracetamol — and taking further paracetamol on top is the most common way people accidentally overdose on it.
Tramadol is an opioid analgesic, but an unusual one. It works in two ways at once:
- It acts weakly on opioid receptors, the same targets as codeine and morphine, dampening pain signalling.
- It increases serotonin and noradrenaline in the spinal cord, which independently reduces pain transmission — the same mechanism some antidepressants use against nerve pain.
That dual action makes tramadol useful for pain with a nerve component, but it also creates the interaction risk covered below: combining it with medicines that raise serotonin can cause serotonin syndrome.
Tramadol also depends on your genetics. It is converted by a liver enzyme into a form that is far more active at opioid receptors, and people vary considerably in how fast they do this. Some get little relief; a smaller number convert rapidly and get an unexpectedly strong effect. This is a real explanation for why tramadol works well for one person and not for another.
In the Co version, paracetamol adds a different mechanism, allowing less tramadol to be used for the same effect.
What is Doltrex commonly used for?
- Moderate to severe acute pain, where paracetamol or an anti-inflammatory has not been enough.
- Pain after surgery or injury.
- Dental pain, in more severe cases.
- Musculoskeletal and back pain, for short courses.
- Osteoarthritis pain, when other options are unsuitable or insufficient.
- Nerve-related pain, where its serotonin and noradrenaline effect can help.
- Cancer-related pain, as part of a broader plan.
It is intended for short-term use in most situations. Tramadol is an opioid, and tolerance, dependence and withdrawal all occur with continued use. It is generally added to — not substituted for — simple painkillers, since paracetamol and anti-inflammatories work by different mechanisms and combining them often gives better relief at a lower opioid dose.
It relieves pain; it does not treat the cause.
How Doltrex fits into this medicine category
| Group | Examples | What it does |
|---|---|---|
| Simple analgesics | Paracetamol (Donapan) | Pain and fever; little anti-inflammatory effect |
| NSAIDs | Ibuprofen, diclofenac | Pain and inflammation |
| Weak opioids | Tramadol (Doltrex), codeine | Moderate pain, when the above are insufficient |
| Strong opioids | Morphine, oxycodone | Severe pain |
| Combination analgesics | Doltrex Co, Mybulen | Paracetamol plus an opioid |
| Corticosteroids | Prednisone | Powerful anti-inflammatory, as courses |
| Nerve pain agents | Pregabalin, amitriptyline | Pain generated by nerves |
Pain treatment is usually stepped: simple analgesics first, then an opioid added if needed, at the lowest effective dose for the shortest time. See the pain, inflammation and musculoskeletal medicines hub.
What to check before using Doltrex
Check every other medicine you take for paracetamol if you have Doltrex Co. Cold and flu remedies, sinus products and other painkillers frequently contain it, and doubling up is the leading cause of accidental paracetamol overdose — which can cause fatal liver damage without early symptoms.
Do not combine it with alcohol or other sedatives. Tramadol with alcohol, benzodiazepines such as diazepam, sleeping tablets or sedating antihistamines can dangerously suppress breathing.
Tell your doctor or pharmacist if you:
- Have epilepsy or a history of seizures. Tramadol lowers the seizure threshold — a genuine and specific risk with this medicine.
- Take an antidepressant — SSRIs, SNRIs, tricyclics — or triptans for migraine, linezolid, or an MAOI. These raise serotonin, and combined with tramadol can cause serotonin syndrome.
- Have kidney or liver disease.
- Have breathing problems, sleep apnoea or COPD.
- Have a head injury or raised pressure in the brain.
- Have a history of substance misuse or dependence.
- Are elderly, where sedation, confusion and falls are more likely.
- Are pregnant or breastfeeding.
- Take other opioids, or warfarin.
- Are giving it to a child or adolescent — tramadol is generally avoided under 12, and after certain surgery.
Do not drive or operate machinery until you know how it affects you.
Possible cautions and when to ask a pharmacist or doctor
Common effects are nausea, vomiting, dizziness, drowsiness, constipation, dry mouth, headache and sweating. Nausea and dizziness often settle after the first days. Constipation does not settle on its own — increase fluid and fibre, and ask a pharmacist about a laxative if it persists.
Seek medical attention urgently if you notice:
- Slow, shallow or difficult breathing, or unusual difficulty waking someone. This is an emergency.
- A seizure.
- Agitation, confusion, fever, sweating, shivering, muscle twitching, a racing heart or marked restlessness — possible serotonin syndrome, particularly if you also take an antidepressant. This can develop over hours and needs urgent assessment.
- Severe drowsiness or confusion.
- Swelling of the face, lips or tongue, or difficulty breathing.
- A severe rash or blistering skin.
- Chest pain or palpitations.
With Doltrex Co, treat any suspected paracetamol overdose as an emergency — go to hospital with the packaging even if the person feels entirely well, because liver damage develops silently and the antidote works best early.
Do not stop suddenly after regular use. Tramadol withdrawal causes anxiety, sweating, insomnia, nausea, tremor and agitation, and can include unusual symptoms such as confusion and perceptual disturbance. A doctor will reduce it gradually.
Tell your doctor if the pain is not controlled, if you need it for longer than planned, or if you find yourself taking more than prescribed. Speak up early — dependence is far easier to address before it is entrenched.
Related medicine guides
- Browse Pain, Inflammation & Musculoskeletal Medicines guides
- Read: Prednisone used for
- Read: Donapan used for
Frequently asked questions
What is Doltrex 50 mg used for? Moderate to severe pain where ordinary painkillers have not been enough — after surgery or injury, dental pain, back and musculoskeletal pain. It contains tramadol 50 mg.
What is the difference between Doltrex and Doltrex Co? Doltrex 50 mg is tramadol alone. Doltrex Co contains less tramadol plus paracetamol. With the Co version, do not take additional paracetamol.
Is Doltrex a strong painkiller? It is an opioid, but a relatively weak one — stronger than paracetamol, weaker than morphine. How well it works varies genuinely between people.
Is tramadol addictive? Tolerance and dependence can develop with continued use, which is why it is Schedule 5 and intended for short courses.
Can I take it with paracetamol? With plain Doltrex 50 mg, usually yes. With Doltrex Co, no — it already contains paracetamol. Check with a pharmacist.
Can I take it with ibuprofen? They work differently and are often used together on advice. That is separate from the paracetamol caution.
Can I drink alcohol with it? No. The combination can dangerously suppress breathing.
Why does it interact with antidepressants? Tramadol raises serotonin, as many antidepressants do. Together they can cause serotonin syndrome, a serious reaction. Tell your doctor everything you take.