Cogesic combines paracetamol 500 mg with codeine phosphate 8 mg. It is used for moderate pain — headache, backache, period pain, dental and post-operative pain — where paracetamol alone is not enough. It contains an opioid, so it is for short-term use only.
What is Cogesic?
Cogesic contains two painkillers:
- Paracetamol 500 mg — a simple analgesic
- Codeine phosphate 8 mg — a weak opioid
Paracetamol works mainly in the central nervous system, reducing how pain is perceived. Codeine is converted by the liver into morphine, which acts on opioid receptors to block pain signals. Together they relieve pain better than paracetamol alone.
Codeine has a peculiarity worth knowing. How well it works depends on your genetics. The liver enzyme CYP2D6 converts codeine to morphine, and people vary widely in how much of that enzyme they have. Roughly one person in ten converts very little, and for them codeine does almost nothing — which explains why some people find codeine-containing painkillers no better than plain paracetamol. A small number convert unusually fast and get a much stronger effect than intended, which is why codeine is not given to children and is avoided in breastfeeding.
At 8 mg per tablet, Cogesic sits at the lower end of the codeine range. Products such as Synaleve and Mybulen contain 10 mg, and prescription-strength combinations more.
What is Cogesic commonly used for?
Cogesic is used for moderate pain where a simple painkiller has not been sufficient:
- Headache, including tension headache.
- Backache and muscular pain.
- Period pain.
- Dental pain, including after an extraction.
- Post-operative pain, short-term.
- Pain after injury — sprains and strains.
- Pain where an anti-inflammatory is unsuitable, since Cogesic contains no NSAID. This is a genuine advantage for someone with ulcer history, kidney disease or heart failure.
That last point is worth drawing out. Because it pairs paracetamol with codeine rather than with ibuprofen, Cogesic avoids the stomach, kidney and cardiovascular cautions that come with anti-inflammatories. For someone who cannot take an NSAID but needs more than paracetamol, that combination is useful.
The trade-off is the opioid — and the risk it carries is not about a single dose, it is about weeks.
How Cogesic fits into this medicine category
| Type | Examples | Note |
|---|---|---|
| Plain paracetamol | Donapan, Napamol | No opioid; try this first |
| Paracetamol + codeine | Cogesic, Synaleve, Stopayne | Stronger; no NSAID cautions |
| Plain anti-inflammatory | Ibuprofen (Unifen), diclofenac | Better for inflammatory pain |
| Triple combinations | Mybulen | Ibuprofen, paracetamol and codeine together |
| Corticosteroids | Prednisone | Inflammatory conditions, as courses |
Start at the top of that ladder and move up only when needed. See the pain, inflammation and musculoskeletal medicines hub.
What to check before using Cogesic
Do not take any other paracetamol product. Cogesic already contains 500 mg per tablet — a full standard dose. Cold and flu remedies, sinus preparations and other combination painkillers commonly contain paracetamol, and adding one is how accidental overdose happens.
Do not drive until you know how the codeine affects you.
Do not drink alcohol with it.
Speak to a pharmacist or doctor if:
- You have breathing problems — sleep apnoea, COPD, severe asthma. Codeine suppresses breathing.
- You have a history of dependence on codeine, other opioids or alcohol.
- You have liver disease, or drink heavily. Both ingredients matter here.
- You have kidney disease.
- You have a head injury or raised pressure in the skull.
- You are pregnant or breastfeeding. Codeine passes into breast milk and is generally avoided when breastfeeding.
- The medicine is for a child or teenager. Codeine is not given under 12, nor to under-18s after tonsil or adenoid surgery.
- You are prone to constipation, or have a bowel condition.
- You take other sedating medicines, a benzodiazepine, or another opioid.
- You are older, where sedation, confusion and constipation are more likely.
Follow the pack instructions, and note the maximum in 24 hours.
Possible cautions and when to ask a pharmacist or doctor
Do not take it for more than a few days. Codeine dependence develops without any decision to misuse anything — the usual pattern is someone who started for genuine pain, found it helped, and kept going because stopping felt worse.
Signs worth acting on: taking it most days, exceeding the pack maximum, needing it for pain it once handled easily, buying from several pharmacies, or feeling restless, achy, sweaty, anxious or unable to sleep without it. Those last symptoms are codeine withdrawal, and they are routinely mistaken for the original pain returning — which is what sustains the cycle.
Medication overuse headache is the other trap. Taking a painkiller for headache on most days produces headaches caused by the treatment. If you are using one more than about two days a week, raise it with a doctor.
If any of that is familiar, speak to a doctor or pharmacist. This is common, it is not a failure of character, and there is effective help.
Paracetamol overdose is a medical emergency with no early warning. If too much has been taken, go to an emergency department immediately with the packaging, even if the person feels entirely well.
Constipation is very common with codeine — increase fluids and fibre, and ask about a laxative if needed.
Seek urgent medical attention for slow or shallow breathing, extreme drowsiness or difficulty waking someone, confusion, severe constipation with abdominal pain, facial or throat swelling, or difficulty breathing.
Related medicine guides
- Browse Pain, Inflammation & Musculoskeletal Medicines guides
- Read: Prednisone used for
- Read: Donapan used for
Frequently asked questions
What is Cogesic used for? Moderate pain — headache, backache, period pain, dental and post-operative pain — where plain paracetamol is not enough. It contains paracetamol and codeine.
Does it contain codeine? Yes, 8 mg per tablet. Codeine is an opioid and causes dependence with regular use.
Can I take paracetamol with it? No. Each tablet already contains 500 mg of paracetamol. Check cold and flu remedies too.
Why does it not seem to work for me? Around one person in ten has little of the liver enzyme that converts codeine to morphine, so codeine does very little for them. That is a known genetic variation, not imagination.
How long can I take it? A few days. Longer use leads to dependence and can cause medication overuse headache.
Does it upset the stomach like ibuprofen? It contains no anti-inflammatory, so it avoids those stomach and kidney cautions. Its main effects are constipation and drowsiness from the codeine.