Painkillers designed for short-term use behave differently when taken for months. Risks that are negligible over three days accumulate, and two problems appear that do not exist with occasional use at all.
The first is medication-overuse headache. Taking painkillers frequently for headaches can itself cause headaches, producing a cycle where the treatment sustains the problem. It is common, it is easily missed, and the only way out is a supervised reduction, during which headaches temporarily get worse before improving. If you take something for headache on most days, this is worth raising specifically.
The second is dependence on codeine-containing products, which develops from ordinary use rather than misuse.
Common side effects of this pharmacy medicine or category
What accumulates depends on which family you are taking:
- Anti-inflammatories. Stomach ulcers and bleeding, effects on kidney function, raised blood pressure, and a small increase in cardiovascular risk. These scale with dose and duration. See long-term ibuprofen side effects.
- Paracetamol. Generally the best tolerated over time, though regular use still counts towards your daily total and can affect INR on warfarin.
- Codeine combinations. Constipation, tolerance, dependence, and withdrawal on stopping.
Across all three, the ordinary effects tend to be under-reported over time simply because people get used to them.
Interactions and duplicate-ingredient risks
Over months, the chance of a duplicate ingredient rises simply because more products get bought. Paracetamol is the usual overlap, and combination painkillers plus cold remedies plus a plain tablet is the common route to exceeding the daily total. See taking two medicines with paracetamol.
Signs your use has crept up, worth recognising without judgement: buying more often than you used to, taking something most days, taking it before pain starts, feeling uneasy about running out, or finding it harder to stop than you expected.
Children, pregnancy, older adults and chronic medicine cautions
Older adults carry the highest risk from prolonged anti-inflammatory use: stomach bleeding often without warning indigestion, kidney effects, and falls from codeine. See side effects in older adults.
Anyone with ulcer history, kidney disease, heart failure, asthma or on blood thinners should not be on long-term anti-inflammatories without review and usually stomach protection.
Warning signs and overdose concerns
Emergency care for signs of gut bleeding:
- Vomiting blood, or material that looks like coffee grounds
- Black, tarry or sticky stools
- Severe or sudden abdominal pain
- Feeling faint, breathless or unusually tired, which can indicate slow blood loss
Same-day advice for passing much less urine than usual, marked ankle swelling, or persistent new indigestion.
Book a review if you have been taking any painkiller most days for more than a few weeks. Persistent pain needs a cause and a plan, not an indefinite supply. That review might produce a different medicine, stomach protection, a referral, or non-medicine approaches that work better over time.
Questions to ask a pharmacist before using it
- I have been taking this most days for months. What should we do?
- Could my headaches be caused by the painkillers themselves?
- Do I need stomach protection with an anti-inflammatory?
- Should my kidney function be checked?
- If this contains codeine, how do I come off it safely?
Related OTC and medicine-safety guides
- Painkiller side effects
- NSAID side effects
- Chronic pain medication side effects
- When to see a doctor about an OTC medicine
- Report an OTC medicine side effect
See also codeine side effects and long-term medicine side effects.
Medical Disclaimer: This content is for informational and educational purposes only and does not constitute medical diagnosis, prescription, or professional advice. Always read the patient information leaflet and consult a qualified doctor or pharmacist regarding any medicine or health concern.