Diclofenac tablets are used for adults whose joint, muscle, or injury-related pain requires an anti-inflammatory painkiller. They reduce prostaglandin activity to help relieve inflammatory pain and swelling.
Diclofenac, the active ingredient of Diclofenac tablets, is a non-steroidal anti-inflammatory drug used to relieve inflammatory pain and swelling.
The dose is decided individually, taking age, other medicines, and health conditions into account. Use the smallest effective dose for the shortest practical time, which is the approach reflected in NSAID safety guidance.
Tablets should be swallowed, not used as a substitute for rest, rehabilitation, or treatment of the cause of pain. Taking more tablets for several days because a sprain remains painful can raise the risk of harm without speeding ligament healing.
Diclofenac tablets contain diclofenac as the active ingredient. Diclofenac is a non-steroidal anti-inflammatory drug that reduces prostaglandin activity to help relieve inflammatory pain and swelling.
Diclofenac blocks cyclooxygenase enzymes, often shortened to COX enzymes. These enzymes help the body make prostaglandins after tissue injury or during inflammation. Lower prostaglandin production means less sensitisation of pain receptors, less swelling, and a lower fever response.
Diclofenac has relative preference for cyclo-oxygenase-2, or COX-2, at therapeutic concentrations, though it is not a purely COX-2 selective NSAID. COX-2 becomes more active at inflamed tissue sites. COX-1 also has useful roles in protecting the stomach lining, supporting kidney blood flow, and helping platelets function. This explains why an anti-inflammatory effect can be accompanied by stomach, kidney, or bleeding-related adverse effects.
The European Medicines Agency identifies diclofenac’s cardiovascular risk profile as requiring the same precautions applied to selective COX-2 inhibitors, especially with higher doses or longer exposure. [1]
Doctors may use oral diclofenac tablets for conditions such as:
Diclofenac does not repair cartilage, ligaments, or muscles. It reduces the inflammatory response that makes movement painful while tissue recovery takes place.
Taking diclofenac only when pain becomes severe can lead some people to take doses too close together. Keeping to the prescribed schedule is safer than trying to catch up.
Another common mistake is treating diclofenac as interchangeable with every other anti-inflammatory tablet. Adding ibuprofen, naproxen, or aspirin can substantially increase gastrointestinal and kidney risk without reliably improving pain relief.
People also underestimate dehydration. Vomiting, diarrhoea, fever, poor fluid intake, and heavy alcohol intake can reduce kidney perfusion, making NSAID-related kidney injury more likely.
It is also generally unsuitable or requires prescriber-led assessment in people with:
Avoid taking diclofenac with another oral NSAID. Medicines that can raise risk include anticoagulants such as warfarin, antiplatelet drugs, corticosteroids, selective serotonin reuptake inhibitors, ACE inhibitors, angiotensin receptor blockers, diuretics, lithium, methotrexate, and ciclosporin. The interaction pattern matters because it can increase bleeding, kidney injury, blood-pressure changes, or medicine toxicity.
Diclofenac is not for you if you have had an allergic reaction, asthma attack, hives, or nasal swelling after aspirin, diclofenac, ibuprofen, naproxen, or another NSAID.
The most frequent diclofenac adverse effects are gastrointestinal. Indigestion, nausea, abdominal discomfort, diarrhoea, constipation, headache, dizziness, and fluid retention may occur. These symptoms do not always mean serious injury, yet ongoing stomach pain deserves attention because ulcers can develop with few early warning signs.
Serious reactions are less common but need prompt action. Gastrointestinal bleeding may present as black, tar-like stools or vomit resembling coffee grounds. A serious allergic reaction can include wheezing, swelling of the lips or face, widespread hives, or collapse. Severe skin reactions may start with fever, sore throat, painful red or purple rash, blistering, or peeling.
Diclofenac can raise blood pressure, worsen fluid retention, and increase cardiovascular risk in susceptible people. Long-term or high-dose NSAID exposure is linked with a higher risk of heart attack and stroke, and the United States Food and Drug Administration warns that this risk can appear early in treatment. [3]
Diclofenac, ibuprofen, naproxen, indometacin, and aspirin are NSAIDs, yet they differ in duration, tolerability, and risk profile. Paracetamol works through a different mechanism and has little anti-inflammatory action. Combined paracetamol and ibuprofen tablets also have different safety considerations from diclofenac alone.
| Medicine | Usual clinical role | Key limitation |
|---|---|---|
| Diclofenac | Inflammatory joint, muscle, and acute injury pain | Gastrointestinal, cardiovascular, kidney, and liver risks require careful selection |
| Ibuprofen | Short-term mild to moderate inflammatory pain | Can still cause ulcers, kidney injury, and NSAID-related bleeding |
| Naproxen | Inflammatory pain needing longer symptom coverage | Stomach irritation and bleeding risk remain relevant |
Ibuprofen is often used for shorter-lived mild pain, while naproxen may provide longer symptom coverage for some inflammatory conditions. Indometacin can be effective but is often less well tolerated because central nervous system and gastrointestinal effects can be troublesome. Aspirin is not routinely interchangeable with diclofenac for pain management because its antiplatelet effect and bleeding implications differ.
Health Canada advises that NSAID selection should account for cardiovascular disease, gastrointestinal history, kidney function, age, and concurrent medicines. [2]
In clinical practice, doctors often start by asking what is causing the pain rather than focusing only on its intensity. A short diclofenac course can be reasonable for inflammatory pain in a person without major risk factors. It is a less attractive option for someone with recurrent indigestion, a prior ulcer, heart disease, or declining kidney function.
Doctors also look for the point at which pain medicine stops being the answer. A painful joint that becomes red, hot, rapidly swollen, or difficult to bear weight on may indicate infection, gout, fracture, or another condition requiring examination. Persistent back pain with leg weakness, saddle numbness, bladder changes, or fever also needs urgent assessment.
Keep Diclofenac tablets in a dry place at normal room temperature, away from heat, moisture, and direct sunlight. Keep them secured where children and pets cannot access them. During travel, carry the tablets in a closed container protected from excessive heat, such as a hot vehicle. A labelled container can also prevent mix-ups. Health Canada’s 2024 medicine-safety advice supports storing medicines away from humidity and heat sources.
Alcohol can irritate the stomach lining and increase the chance of gastrointestinal bleeding when combined with an NSAID. The risk is greater with frequent alcohol intake, previous ulcer disease, anticoagulant use, or older age. Avoiding alcohol during a Diclofenac course is the most cautious approach, especially if you have indigestion or abdominal pain. The EMA’s 2013 diclofenac safety review emphasised careful risk reduction in people with factors that increase NSAID harm.
Swallow Diclofenac tablets whole unless a prescriber or pharmacist has confirmed that the specific tablet can be divided. Some tablets use coatings or modified-release technology intended to control where or how quickly diclofenac is released. Crushing or chewing can increase stomach irritation and change the intended release pattern. WHO medicine-use guidance from 2023 supports using oral solid medicines only as their formulation permits.
Taking Diclofenac with food, milk, or a snack can reduce stomach upset for many people. Food may affect how quickly a tablet starts to work, so the exact timing should follow the prescribed directions. Taking it on an empty stomach may be harder on the stomach, especially for people prone to indigestion. Health Canada’s 2024 NSAID safety information identifies gastrointestinal effects as a central consideration with this medicine class.
Diclofenac should be avoided during pregnancy from 20 weeks onward unless a clinician has specifically determined it is necessary. NSAIDs later in pregnancy can affect fetal kidney function, amniotic fluid, and fetal circulation. Breastfeeding decisions need individual assessment because maternal dose, treatment duration, and infant factors matter. The EMA’s 2023 pregnancy-related NSAID guidance supports avoiding systemic NSAIDs late in pregnancy.
Course length depends on the condition, response, age, other medicines, and health conditions. Short courses are commonly used for acute inflammatory pain, while long-term use needs periodic reassessment because risks can accumulate over time. Long-term diclofenac may be considered in selected patients, though cardiovascular, gastrointestinal, kidney, and liver factors must be reviewed. The FDA’s 2015 NSAID safety communication advises using the lowest effective dose for the shortest duration consistent with treatment goals.
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I used Diclofenac tablets at the prescribed dose for several days for a flare of knee arthritis that had made stairs difficult. The stiffness eased over several days and I was able to sleep more comfortably. I developed indigestion when I took it without breakfast, so taking it with food made a noticeable difference.
I took it at the prescribed dose for several days for back pain after lifting equipment at work. It helped the movement-related pain, but I stopped after I noticed ankle swelling and spoke with my prescriber. I already take treatment for blood pressure, which turned out to matter.
After several days at the prescribed dose, the tablets reduced the aching from a shoulder strain enough for physiotherapy exercises to be manageable. I expected an instant cure and was frustrated at first. Rest and the exercises still did most of the work.
