An analgesic is a painkiller — the general term for any medicine whose job is to relieve pain. It is not a single product. Which analgesic suits you depends on what kind of pain you have, and matching the two is what makes the difference between relief and disappointment.
What is Analgesic?
“Analgesic” is a category, not a medicine. It comes from the Greek an- (without) and algos (pain), and covers everything from a paracetamol tablet to morphine.
Analgesics fall into a few groups that work in genuinely different ways, and understanding the difference is more useful than any brand name.
Simple analgesics — paracetamol. Acts mainly in the central nervous system to reduce the perception of pain and lower fever. Almost no effect on inflammation. The gentlest option on the stomach, kidneys and heart, and generally the preferred painkiller in pregnancy.
Anti-inflammatories (NSAIDs) — ibuprofen, diclofenac, naproxen, meloxicam. Block the COX enzymes that produce prostaglandins, the chemicals causing pain, swelling and fever where tissue is damaged. They treat the inflammation, not just the pain — which is why they work better for swollen joints, injuries and period pain. The cost is stomach, kidney and cardiovascular risk.
Opioids — codeine, tramadol, morphine, fentanyl. Act on opioid receptors in the brain and spinal cord, damping the pain signal centrally. Powerful, and carrying tolerance, dependence, constipation and — with repeated use for headache — rebound pain.
Nerve pain agents — amitriptyline, pregabalin, gabapentin. Not painkillers in the ordinary sense: they calm overactive nerves, and they are the treatment for nerve pain, where ordinary painkillers work poorly.
Topical analgesics — diclofenac or ibuprofen gel, capsaicin. Deliver the medicine locally with a fraction of the whole-body exposure. Considerably underused for localised joint and muscle problems.
Adjuvants — muscle relaxants, steroids, antispasmodics — treat something generating pain rather than the pain itself.
What is Analgesic commonly used for?
Matching the analgesic to the pain is the whole skill, and it is mostly straightforward:
| Kind of pain | Usually best |
|---|---|
| Headache, tension type | Paracetamol or ibuprofen |
| Period pain | An anti-inflammatory, started at the first sign |
| Swollen joint, sprain, injury | An anti-inflammatory; a gel for one joint |
| Osteoarthritis | Topical NSAID first; paracetamol; exercise and weight loss |
| Dental pain | Ibuprofen with paracetamol — strong evidence |
| Back pain | Anti-inflammatory, plus staying active |
| Fever with aches | Paracetamol or ibuprofen |
| Nerve pain, sciatica, shingles pain | Amitriptyline or pregabalin — not ordinary painkillers |
| Colic, cramping | An antispasmodic |
| Severe acute pain | Opioid combination, short term |
Two combinations worth knowing.
Paracetamol and ibuprofen together work better than either alone, because their mechanisms are separate. For dental and post-operative pain the evidence is genuinely strong, and it often removes the need for anything stronger. They can be taken together on advice, or alternated.
What does not help is doubling one. Above 400 mg of ibuprofen per dose, pain relief barely improves while stomach, kidney and cardiovascular risks keep rising. Adding a second mechanism beats increasing one.
Two cautions that catch people out.
Paracetamol is hidden in many products — cold and flu remedies, sinus preparations, some cough mixtures, and compound painkillers such as Synaleve and Stopayne. Taking two means taking paracetamol twice, the commonest route to serious accidental overdose. Read the active ingredients on everything.
Painkillers taken most days can cause headache. Medication-overuse headache is common, under-recognised, and caused by the treatment — using any painkiller for headache on more than about ten to fifteen days a month sustains the problem it is meant to fix.
How Analgesic fits into this medicine category
| Group | Examples | Guide |
|---|---|---|
| Simple analgesics | Paracetamol | Donapan |
| NSAIDs | Ibuprofen, diclofenac, meloxicam | Inza, Motifine, Flexocam |
| COX-2 selective | Celecoxib, etoricoxib | Cyretib, Thrytix |
| NSAID + paracetamol | Combination tablets | Mypaid Forte |
| Opioid combinations | Tramadol/paracetamol, codeine products | Patram, Painogesic |
| Corticosteroids | Prednisone | Powerful anti-inflammatory, in courses |
| Nerve pain agents | Pregabalin, amitriptyline | Glovireg, Trepiline |
| Topical | Diclofenac gel | Local effect, far lower risk |
See the pain, inflammation and musculoskeletal medicines hub.
What to check before using Analgesic
Before taking any painkiller, check what else you are taking contains. Paracetamol and ibuprofen both appear in combination products under names that do not mention them.
Speak to a pharmacist or doctor if you:
- Have or have had a stomach ulcer, gastritis or gut bleeding — this rules out most anti-inflammatories without stomach protection.
- Have kidney disease, liver disease or heart failure.
- Have high blood pressure or heart disease.
- Have asthma. Anti-inflammatories trigger severe attacks in a minority of asthmatics.
- Are over 65, where stomach, kidney and cardiovascular risks all rise.
- Take warfarin or another blood thinner, low-dose aspirin, steroids, an SSRI antidepressant, an ACE inhibitor, ARB or diuretic, lithium or methotrexate.
- Are pregnant. Paracetamol is generally preferred; NSAIDs are avoided, particularly after 20 weeks.
- Weigh under 50 kg, or drink alcohol heavily — both lower the safe paracetamol maximum.
- Are buying for a child. Children are dosed by weight using paediatric preparations, never adult tablets.
Practical points:
- Take anti-inflammatories with food.
- Follow the pack’s 24-hour maximum, particularly for paracetamol.
- Use the lowest effective dose for the shortest time.
- For one painful joint or muscle, try a gel first.
- Drink enough fluid, especially in hot weather — dehydration plus an NSAID is hard on the kidneys.
Possible cautions and when to ask a pharmacist or doctor
Paracetamol overdose is a medical emergency, and it does not feel like one. Someone who has taken too much may feel entirely well for a day or more while serious liver damage develops. If you think anyone has taken too much — even accidentally, even if they seem fine — go to an emergency department immediately with the packaging. There is an effective antidote and it works best given early.
Get emergency help for:
- Any suspected paracetamol overdose.
- Vomiting blood, or black tarry stools, or severe abdominal pain.
- Chest pain, sudden breathlessness, or signs of a stroke.
- Swelling of the face, lips or tongue, or difficulty breathing.
- A widespread blistering or peeling rash.
- Slow or shallow breathing, or difficulty waking someone on an opioid.
Seek prompt advice for:
- Persistent indigestion or stomach pain on an anti-inflammatory. Do not just take an antacid and continue.
- Wheezing after an anti-inflammatory.
- Reduced urine output, swollen ankles, or unusual tiredness.
- Needing more than prescribed, or wanting to, on an opioid.
See a doctor rather than continuing to self-treat if pain is:
- Severe, or getting worse.
- Lasting more than a few days without a clear cause.
- Waking you at night.
- Accompanied by fever, unexplained weight loss, numbness, weakness, or loss of bladder or bowel control. Back pain with any of the last two needs emergency assessment.
- Chest pain, which should never be assumed to be muscular.
- Requiring painkillers most days.
A closing point. Persistent pain deserves a diagnosis, not an escalating series of painkillers. Much chronic pain responds better to physiotherapy, exercise, weight loss, sleep and psychological approaches than to any tablet — and for nerve pain in particular, ordinary painkillers barely work while the right medicine works well. Getting the cause identified is what changes the outcome.
Related medicine guides
- Browse Pain, Inflammation & Musculoskeletal Medicines guides
- Read: Prednisone used for
- Read: Donapan used for
Frequently asked questions
What is an analgesic used for? Relieving pain. It is a category covering paracetamol, anti-inflammatories, opioids, nerve pain medicines and topical preparations — not a single product.
Which painkiller should I take? It depends on the pain. Anti-inflammatories for swelling, injury and period pain; paracetamol for general pain and fever or where NSAIDs are unsuitable; nerve pain agents for nerve pain; a gel for one localised joint.
Can I take paracetamol and ibuprofen together? Yes, on advice — they work by different mechanisms and the combination is more effective than either alone. Do not combine two anti-inflammatories.
Why isn’t my painkiller working for sciatica? Nerve pain responds poorly to ordinary painkillers. Amitriptyline, pregabalin or gabapentin are the medicines that work for it.
Is it safe to take painkillers every day? Not without advice. Daily anti-inflammatory use raises stomach, kidney and cardiovascular risks, and any painkiller taken for headache on more than about ten to fifteen days a month can cause medication-overuse headache.
What is the strongest painkiller I can buy without a prescription? Strength is the wrong frame — matching the medicine to the pain matters more. Ibuprofen with paracetamol is genuinely effective for most acute pain and needs no prescription.
Why must I check labels for paracetamol? Because it is in many cold and flu and compound products under names that do not mention it. Taking two means taking paracetamol twice, which is the commonest cause of accidental overdose.
What if I have taken too much paracetamol? Go to an emergency department immediately with the packaging, even if you feel well. Liver damage develops without early symptoms and the antidote works best given early.