Lupirtin contains Flupirtine Maleate 100mg. It is a centrally acting, non-opioid, prescription-only painkiller. It treats moderate to severe pain when standard options such as paracetamol or ibuprofen are no longer sufficient. Common side effects include tiredness, dizziness, nausea, and constipation. Liver toxicity is a serious risk. Always consult your GP or pharmacist before use. Do not take Lupirtin without a valid UK prescription.
Being prescribed a new painkiller raises a lot of questions. If your doctor has recommended Lupirtin, it is completely natural to want to understand what it does, how it works, and what risks it carries.
Lupirtin contains the active ingredient Flupirtine Maleate 100mg. It belongs to a group of medicines called centrally acting, non-opioid analgesics, meaning it works on the central nervous system to reduce pain, without being an opioid like codeine or an anti-inflammatory like ibuprofen.
If you have heard of Nefopam, sold in the UK under the brand name Acupan, you will already have a sense of what this type of medicine does. Both are non-opioid painkillers used when standard options have fallen short. However, they are entirely different medicines with different active ingredients and different risks. This guide explains everything clearly.
How Lupirtin Works in the Body
By opening neuronal potassium channels in the central nervous system, Flupirtine Maleate reduces nerve cell excitability. Pain-transmitting nerve cells become less active as a result.
It also acts indirectly on NMDA receptors, which are closely linked to chronic and nerve-related pain, and has mild muscle-relaxant properties. This makes it particularly useful when pain and muscle tension co-occur, as in back pain.
Unlike ibuprofen, it does not irritate the stomach lining. Opioid receptors are left entirely unaffected, which sets Lupirtin apart from opioid-based medicines such as codeine. It therefore avoids the gastrointestinal risks of NSAIDs and the dependency risks of opioids.
Lupirtin and Nefopam (Acupan): Understanding the Difference
You may already be familiar with Nefopam (Acupan), routinely prescribed by NHS doctors as a non-opioid painkiller for moderate to severe pain. It is a useful reference point for understanding where Lupirtin fits, but the two must never be confused or swapped without medical advice.
| Feature | Lupirtin (Flupirtine Maleate 100mg) | Nefopam (Acupan 30mg) |
|---|---|---|
| Active Ingredient | Flupirtine Maleate | Nefopam Hydrochloride |
| Mechanism | Potassium channel opener; NMDA modulator | Monoamine reuptake inhibitor |
| UK Availability | Prescription-only (POM) | Prescription-only (POM) — NHS available |
| Primary Use | Moderate to severe pain | Moderate to severe pain |
| Key Safety Risk | Liver toxicity — LFT monitoring is required | Anticholinergic effects; seizure risk |
| Consult Your Doctor? | Always | Always |
⚠️ These medicines are not interchangeable. Never switch between Lupirtin and Nefopam without speaking to your GP or pharmacist. Based on your individual condition, the most appropriate treatment option will be decided by your doctor.
When Doctors Prescribe Lupirtin
Lupirtin is not a first-line treatment. Doctors consider it when standard options are contraindicated or have not provided enough relief.
It may be prescribed for:
• Post-operative pain — recovery following surgery
• Musculoskeletal pain — including back pain and muscle spasm
• Acute traumatic pain — following injury or accident
• Dental pain — where standard analgesics have proved insufficient
• Cancer-related pain — as part of a managed pain programme
• Gynaecological pain — including dysmenorrhoea
• Tension-type headaches — where central sensitisation is a factor
Your doctor will review your full medical history before prescribing. Lupirtin is only appropriate where clinically indicated.
Possible Side Effects
Like any medicine, side effects are possible. Not everyone will experience them. Knowing what to look out for helps you stay safe.
| Side Effect | Symptoms / Signs | Recommended Actions |
|---|---|---|
| Tiredness | General fatigue and low energy | Rest as needed; eat regularly; stay hydrated; limit caffeine and alcohol; try a gentle walk |
| Dizziness | Lightheadedness, especially on standing | Rise gradually from sitting or lying; sit or lie down if dizzy until it passes; do not drive until you know how Lupirtin affects you |
| Nausea | Unsettled stomach | Eat small, frequent meals; sip cold drinks slowly; try ginger tea or ginger biscuits |
| Heartburn & Stomach Discomfort | Digestive discomfort, especially early in treatment | Avoid fatty or heavily spiced foods; do not lie down immediately after eating; ask your pharmacist about suitable antacids |
| Constipation | Irregular or difficult bowel movements | Increase fibre and fluid intake; aim for at least 8 glasses of water daily; maintain a gentle, regular exercise routine |
🚨 Serious Side Effects — Stop taking Lupirtin and seek urgent medical help immediately
| Warning Sign | Details |
|---|---|
| Jaundice | Yellowing of the skin or whites of the eyes |
| Urine / Stool changes | Dark or tea-coloured urine, or pale stools |
| Liver symptoms | Severe unexplained fatigue or pain in the upper right abdomen |
| Allergic reaction (face/throat) | Swelling of the face, lips, or throat |
| Allergic reaction (respiratory/skin) | Difficulty breathing or sudden skin rash |
| Neurological symptoms | Confusion or seizures |
Call 999 or go to your nearest A&E immediately. Side effects should never be left unreported.
The MHRA Yellow Card scheme at yellowcard exists precisely so that patients can flag concerns promptly.
Important Safety Advice
Liver monitoring
Flupirtine Maleate carries a known risk of liver toxicity. This concern led the European Medicines Agency to withdraw authorisation for all Flupirtine-containing medicines in 2018. To keep liver enzyme levels under review, regular blood tests will be arranged by your doctor. Attend every follow-up appointment. If your results are abnormal, your doctor will stop the medicine immediately.
Alcohol
Avoid alcohol completely whilst taking Lupirtin. It worsens dizziness and drowsiness and significantly increases the risk of liver damage. This combination is clinically unsafe. Do not resume drinking without first speaking to your prescriber.
Drug interactions
No specific interactions are currently confirmed in available databases. Your doctor and pharmacist must be kept fully informed of every medicine you are currently taking — this includes over-the-counter products, vitamins, and herbal remedies, where interactions may otherwise go unnoticed. Medicines that affect the liver or the central nervous system require particular care.
Pregnancy and breastfeeding
Because sufficient safety data for use during pregnancy does not exist, Lupirtin is not recommended for pregnant women. Breast milk may carry traces of this medicine, meaning breastfeeding should be avoided whilst treatment is ongoing. Speak to your GP straight away if you are pregnant, planning a pregnancy, or breastfeeding.
Driving and machinery
Lupirtin may cause dizziness and drowsiness. Until the effects of this medicine on your alertness are known, driving, cycling, and operating heavy machinery should all be avoided. If dizziness is ongoing, contact your doctor before resuming these activities.
Older adults
Because older patients may respond more strongly to the central effects of Lupirtin, dizziness and fatigue should be monitored closely in this group. Doctors often start with a lower dose. Falls risk should be assessed at the outset and monitored throughout treatment.
Accessing Treatment Responsibly
Lupirtin is a prescription-only medicine (POM). You must obtain medicine with a valid prescription from a registered healthcare professional.
Access it only through a regulated UK pharmacy. Purchasing prescription medicines from unverified online sources carries serious risks and should always be avoided. This is unsafe and illegal under UK law.
If you believe Lupirtin may be appropriate for you, speak to your GP. They will review your full medical history and any contraindications before making a prescribing decision.
Frequently Asked Questions
Q: What is the use of lupirtin?
A: Lupirtin contains Flupirtine Maleate 100mg. It relieves moderate to severe pain. Doctors prescribe it when standard painkillers are insufficient. It is a prescription-only medicine.
Q: How does lupirtin work in the body?
A: Lupirtin opens potassium channels in nerve cells. Pain signal transmission to the brain is reduced as a direct result of this action. It also relaxes muscles mildly. It acts on the central nervous system.
Q: Is Lupirtin a narcotic?
A: No. Lupirtin is not a narcotic or opioid. It does not act on opioid receptors. It is a centrally acting, non-opioid painkiller. No dependency risk like codeine exists.
Conclusion
Lupirtin – a prescription-only 100mg Flupirtine Maleate – is a non-opioid analgesic for severe pain, with lower stomach and dependency risks but high liver toxicity concerns, requiring strict monitoring. Similar to Nefopam (Acupan), it fills a non-opioid pain reliever gap, yet they are distinct medicines with separate risk profiles. Always consult your doctor before switching painkillers. Follow the prescription precisely, attend liver check-ups, report any symptoms to your GP promptly, and source Lupirtin from a regulated UK pharmacy with a valid prescription.
References
• NHS — Chronic pain: www.nhsinform.scot
• MHRA Yellow Card Scheme: yellowcard.mhra.gov.uk
Medical Disclaimer
This article is for informational purposes only and does not replace professional medical advice. Always consult a qualified UK healthcare professional before starting, stopping, or changing any treatment. If you are experiencing a medical emergency, call 999 or visit your nearest A&E department immediately.