Ibuprofen can reduce pain and inflammation, but runners should be careful about using it as a training tool. Taking painkillers before a run, during a marathon, or to push through a niggle can hide useful warning signs and may increase the risk of gut, kidney and hydration-related problems — especially during long or hot endurance events.
That does not mean ibuprofen is “bad” or that runners should never use it. It is a common medicine with legitimate uses. But it is not a recovery strategy, and it should not be treated like a gel, electrolyte tablet or pre-run routine.
If you are reaching for ibuprofen regularly because running hurts, the question is not “what dose should I take?” It is “why do I need this to train?”
The short answer: should runners take ibuprofen?
Runners should avoid taking ibuprofen routinely before or during runs, especially long runs and races, unless advised by a healthcare professional. Occasional use after discussion with a pharmacist or GP may be appropriate for some people, but using it to mask pain and keep training is a poor long-term plan.
The biggest concerns are:
- Masking pain that should change your training decision
- Gut irritation, nausea or bleeding risk
- Kidney stress during dehydration or long endurance events
- Potential interaction with other medicines or health conditions
- Creating a habit of “medicating through” bad load management
For UK runners, the practical advice is simple: if you are unsure, ask a pharmacist. If pain is persistent, recurrent, sharp, worsening, or changing your gait, stop guessing and speak to a qualified clinician.
What is ibuprofen?
Ibuprofen is a non-steroidal anti-inflammatory drug, usually shortened to NSAID. It is used for pain and inflammation. In the UK it is available over the counter, which can make it feel casual — but it is still a medicine with side effects and contraindications.
The NHS notes that ibuprofen can help with aches, pains and inflammation, but it is not suitable for everyone. People with certain stomach, kidney, heart, blood pressure or medication issues may need to avoid it or get advice first.
Why runners use ibuprofen
Most runners are not taking ibuprofen for fun. They take it because something hurts, or because they are worried something will hurt.
Common reasons include:
- A sore knee before a long run
- A grumbling Achilles during marathon training
- DOMS after a hard session
- Race-day anxiety about pain
- A desire to “get through” a key session
The problem is that pain is information. It is not always a crisis, but it is a signal. If you block the signal and keep loading the tissue, you may be solving the wrong problem.
Ibuprofen before running: why it is risky
Taking ibuprofen before running is different from taking it while resting at home. During a hard or long run, your body is already under physiological stress. Blood flow is being redirected, your gut may be more sensitive, you may be sweating heavily, and your kidneys are helping manage fluid balance.
Adding NSAIDs into that context can be a bad trade-off. You might feel less discomfort, but you may also be increasing risk in systems that are already working hard.
1. It can mask injury signals
Pain is one of the main ways your body tells you that a tissue is not coping with load. If ibuprofen dulls that pain, you may run further or faster than you otherwise would.
That matters with common running injuries such as tendon pain, bone stress injuries, IT band pain and plantar fascia symptoms. The issue is rarely “not enough painkillers”. It is usually load, recovery, strength, mobility, biomechanics, footwear, terrain, training error, or a combination.
2. It can irritate the gut
Many runners already struggle with gastrointestinal symptoms on long runs. Ibuprofen can irritate the stomach and increase the risk of digestive side effects. Taking it around a hard endurance event may make an already-sensitive gut more vulnerable.
3. It can add kidney stress
Long runs, hot weather and races can involve dehydration and changes in blood flow. NSAIDs can affect kidney blood flow regulation. That is one reason endurance-event ibuprofen use gets flagged in sports medicine discussions.
This is especially relevant for marathon and ultra-distance runners, or anyone racing in heat, with poor hydration, illness, or other risk factors.
4. It may not improve performance anyway
One small randomised trial in 42km trail runners found that ibuprofen did not improve pace, speed or finish time. That does not settle every question, but it supports the practical point: taking ibuprofen during endurance running is not a reliable performance strategy.
What the research says about NSAIDs and endurance running
A 2024 scoping review in BMJ Open Sport & Exercise Medicine looked at the health effects of NSAID use in marathon and ultraendurance running. It grouped potential concerns into five areas: electrolyte balance and hyponatraemia, acute kidney injury, gastrointestinal disturbances, oxidative stress/inflammation/muscle damage, and other medical concerns.
The review did not find clear, statistically significant links across every category, and the authors noted that the evidence base is limited. But there were enough potential signals — especially around kidney function and electrolyte balance — to support a sensible practical approach: do not make NSAIDs part of your default race plan.
Ibuprofen after running: is that different?
Taking ibuprofen after a run may carry less event-specific risk than taking it before or during, because you are no longer exercising. But it still depends on why you are taking it, whether you are hydrated, whether you have eaten, your medical history, and whether it is becoming a habit.
If you occasionally use ibuprofen for a short-term issue and it is suitable for you, that is different from needing it after every long run.
Regular post-run ibuprofen can also encourage the wrong mindset: pain appears, pill follows, training continues unchanged. Good runners do not just collect miles. They adapt the plan when the body is giving them feedback.
What to do instead of relying on painkillers
1. Adjust the training load
If a niggle is building, the first lever is usually load. That might mean reducing intensity, cutting volume, swapping hills for flat running, replacing a session with cross-training, or taking an extra recovery day.
This is not weakness. It is how runners stay consistent for months instead of forcing one heroic week and losing six.
2. Separate soreness from injury pain
General muscle soreness after a hard session is different from sharp, localised, worsening or gait-changing pain. The first may respond to sleep, food, easy movement and time. The second deserves more caution.
Red flags include:
- Pain that changes how you run
- Pain that worsens as the run continues
- Bone tenderness or focal shin/foot pain
- Swelling, heat or significant bruising
- Pain that persists at rest or overnight
- Symptoms that keep returning every time you increase training
If those apply, get professional advice rather than trying to out-supplement or out-medicate the problem.
3. Eat enough to recover
Recovery is not just foam rolling and stretching. Runners need enough total energy, carbohydrate, protein and micronutrients to adapt to training.
If you are under-fuelled, every niggle feels louder. Tendons, bones, immune function, hormones and muscles all depend on adequate energy availability.
4. Sleep more than you want to admit
Sleep is the least glamorous recovery tool and probably the most important. If training is hard and sleep is poor, pain sensitivity, injury risk and perceived effort can all worsen.
5. Build strength before you need it
Many running injuries are capacity problems. The tissue is being asked to tolerate more load than it is ready for. Strength training, progressive loading and sensible programming are more useful than repeatedly muting pain.
Where nutrition support fits
Nutrition will not fix a stress fracture, torn tendon or overloaded training plan. But daily nutrition does affect whether your body is well supported enough to recover from the work you are asking it to do.
That is the difference between an acute painkiller and a daily foundation.
Ibuprofen is a medicine you might use for short-term pain when appropriate. RunStrong is not trying to be that. RunStrong is designed for the everyday nutritional demands of running, with ingredients chosen to support runners’ daily routine: iron, Vitamin D3, L-Carnitine, curcumin and BioPerine®.
Your gels handle race day. Painkillers may have occasional medical uses. But the real recovery work happens in the weeks between races — through training load, sleep, food, strength and daily consistency.
When should runners speak to a professional?
Speak to a pharmacist, GP, physiotherapist or other qualified healthcare professional if:
- You are taking ibuprofen regularly to keep training
- You have stomach ulcers, kidney issues, heart disease, high blood pressure or asthma triggered by NSAIDs
- You take blood thinners, blood pressure medicines, steroids or other regular medication
- You are pregnant or trying to conceive
- You have pain that is sharp, worsening, localised or affecting your gait
- You suspect a bone stress injury
Do not use a blog article to decide whether a medicine is safe for you personally. Use it to ask better questions.
Practical rule of thumb
If you need ibuprofen to complete the run, you probably need to reconsider the run.
That does not mean stopping at the first sign of discomfort. Running is full of sensations. But there is a difference between normal effort and pain you are trying to silence.
The best runners are not the ones who ignore every signal. They are the ones who learn which signals matter.
FAQ
Can I take ibuprofen before a marathon?
It is generally not a good idea to take ibuprofen as part of a marathon plan unless a healthcare professional has specifically advised it. Long races already stress the gut, kidneys and hydration system.
Is paracetamol safer than ibuprofen for runners?
Paracetamol is a different type of painkiller and does not have the same anti-inflammatory action, but it still has dosing limits and safety considerations. Ask a pharmacist or GP if you are unsure what is suitable for you.
Can ibuprofen help DOMS after running?
It may reduce pain for some people, but DOMS usually responds to time, sleep, food, hydration and light movement. If you need painkillers after every hard session, the training load may be too aggressive.
Does ibuprofen speed up running recovery?
Not in the way runners often mean. It may reduce pain or inflammation short term, but recovery is driven by sleep, nutrition, load management and adaptation. Pain relief is not the same as tissue readiness.
What should I do if I already took ibuprofen before a run?
Do not panic. Be sensible: avoid dehydration, do not exceed the label dose, and seek medical help if you feel unwell or have concerning symptoms. For future long runs or races, get proper advice before using NSAIDs.
Sources
- NHS. Ibuprofen for adults: painkiller that also treats inflammation. https://www.nhs.uk/medicines/ibuprofen-for-adults/about-ibuprofen-for-adults/
- NHS. Who can and cannot take ibuprofen for adults. https://www.nhs.uk/medicines/ibuprofen-for-adults/who-can-and-cannot-take-ibuprofen/
- Pannone E, Abbott R. What is known about the health effects of non-steroidal anti-inflammatory drug (NSAID) use in marathon and ultraendurance running: a scoping review. BMJ Open Sport & Exercise Medicine. 2024. https://pmc.ncbi.nlm.nih.gov/articles/PMC10840051/
- de Souza RF et al. Effects of ibuprofen during 42-km trail running on oxidative stress, muscle fatigue, muscle damage and performance: a randomized controlled trial. Research in Sports Medicine. 2024. https://pubmed.ncbi.nlm.nih.gov/36154349/
This article is for general education and does not replace medical advice. Always follow medicine labels, and speak to a pharmacist, GP or qualified healthcare professional if you are unsure whether ibuprofen is suitable for you.