Diclofenac

Generic name: Diclofenac / Diclofenac sodium / Diclofenac potassium

Category: Nonsteroidal anti-inflammatory drug (NSAID), analgesic, anti-inflammatory, antipyretic

Common brand names: Voltaren, Cataflam, Diclac, Diclo-ratiopharm, Diclofenac STADA. Brand availability varies by country.

This article is for dental education only. Diclofenac should be used according to local guidelines, patient-specific risk factors, and professional judgment. Like other NSAIDs, it can cause serious gastrointestinal bleeding, kidney injury, cardiovascular events, allergic reactions, asthma worsening, and important drug interactions.

Diclofenac is a potent NSAID used for pain and inflammation. In dentistry, it may be used for short-term inflammatory dental pain and postoperative pain when an NSAID is appropriate.

It is often considered a strong anti-inflammatory analgesic, but it needs careful risk assessment because diclofenac may carry important cardiovascular, gastrointestinal, and renal safety concerns.

The main safety rule is to use the lowest effective dose for the shortest necessary duration, and to avoid it in patients with significant NSAID risk factors.

• Best use: short-term inflammatory dental pain in low-risk patients
• Common dental context: postoperative pain, surgical pain, inflammatory odontogenic pain
• Main advantage: strong anti-inflammatory analgesic effect
• Main risks: cardiovascular events, stomach bleeding, kidney injury, asthma reaction, drug interactions
• Clinical priority: screen carefully before use, especially in older or medically compromised patients

• Short-term inflammatory dental pain
• Postoperative pain after surgical or traumatic dental procedures
• Pain after extractions when an NSAID is suitable
• Inflammatory pain after periodontal or endodontic procedures
• Temporary pain control while definitive treatment is arranged
• Combination with paracetamol/acetaminophen in selected patients when both medicines are safe and stronger non-opioid analgesia is needed

Example only: Diclofenac potassium 50 mg orally every 8 hours as needed for short-term dental pain, when NSAIDs are appropriate.

A common prescription maximum for oral diclofenac is 150 mg per day, but local product labels and regulations may differ. Lower-dose over-the-counter products, where available, have different limits.

Dose and duration must consider age, kidney function, stomach bleeding risk, cardiovascular risk, pregnancy status, liver risk, current medicines, and local prescribing rules.

• Known hypersensitivity to diclofenac or other NSAIDs
• Previous aspirin- or NSAID-induced asthma, urticaria, angioedema, or severe allergic reaction
• Active stomach ulcer, gastrointestinal bleeding, or serious NSAID-related bleeding history
• Severe kidney disease, significant dehydration, or high renal-risk situation
• Severe heart failure, recent myocardial infarction, significant ischemic heart disease, or high cardiovascular risk without medical approval
• Use before or after coronary artery bypass graft surgery unless specifically managed medically
• Late pregnancy, especially the third trimester
• Use together with another NSAID unless specifically directed by a clinician

• Cardiovascular risk: diclofenac may increase the risk of heart attack, stroke, heart failure, fluid retention, and worsening hypertension.
• Stomach bleeding: risk rises with ulcer history, older age, alcohol use, corticosteroids, anticoagulants, antiplatelets, or prolonged use.
• Kidney injury: risk increases with dehydration, kidney disease, diuretics, ACE inhibitors, ARBs, or high doses.
• Liver effects: diclofenac can rarely cause liver injury; caution is needed in liver disease or prolonged use.
• Asthma reaction: patients with aspirin-sensitive asthma may react to diclofenac.
• Bleeding tendency: diclofenac can affect platelet function and may increase bleeding risk in susceptible patients.
• Pregnancy: avoid especially in late pregnancy unless a physician specifically advises otherwise.

Before recommending diclofenac, ask about heart disease, previous heart attack or stroke, uncontrolled hypertension, stomach ulcers, kidney disease, liver disease, asthma triggered by painkillers, blood thinners, pregnancy, alcohol use, and whether the patient is already taking another NSAID.

• Anticoagulants: warfarin, DOACs, or heparin may increase bleeding risk when combined with NSAIDs.
• Antiplatelet drugs: aspirin, clopidogrel, or similar drugs can increase bleeding risk.
• Corticosteroids: higher risk of gastrointestinal irritation or bleeding.
• SSRIs/SNRIs: may increase gastrointestinal bleeding risk when combined with NSAIDs.
• ACE inhibitors, ARBs, and diuretics: may increase kidney risk, especially in dehydration or older adults.
• Lithium or methotrexate: NSAIDs may increase toxicity risk and require medical review.
• Cyclosporine or tacrolimus: kidney toxicity risk may increase.
• Other NSAIDs: avoid combining diclofenac with ibuprofen, naproxen, aspirin for pain, or similar drugs unless directed.
• Alcohol: increases the risk of stomach irritation and bleeding.

• Stomach pain, heartburn, or indigestion
• Nausea, vomiting, diarrhea, or constipation
• Dizziness, headache, or drowsiness
• Fluid retention or raised blood pressure
• Rash, itching, or photosensitivity
• Worsening asthma in sensitive patients
• Abnormal liver tests or liver-related symptoms in rare cases
• Rare but serious: stomach bleeding, kidney injury, severe allergic reaction, heart attack, stroke, severe skin reaction, liver injury

• Take diclofenac with food or milk to reduce stomach irritation.
• Do not take more than the recommended dose or for longer than advised.
• Do not combine it with ibuprofen, naproxen, aspirin for pain, or another NSAID unless a clinician advises it.
• Avoid alcohol while taking diclofenac, especially if stomach bleeding risk exists.
• Drink enough fluids, especially after surgery, unless medically restricted.
• Stop and seek help if black stools, vomiting blood, chest pain, breathing difficulty, facial swelling, yellow skin, dark urine, or severe rash occurs.
• Contact the dentist if pain worsens, swelling develops, fever appears, or mouth opening becomes limited.

Diclofenac can be effective for dental inflammatory pain, but it should not be treated as a routine “stronger ibuprofen.” Its cardiovascular and gastrointestinal profile requires careful selection. In many dental patients, ibuprofen or paracetamol may be safer first choices depending on the patient’s risk profile.

• Difficulty breathing, wheezing, facial swelling, throat swelling, or collapse after taking diclofenac
• Black stools, bloody stools, vomiting blood, or severe stomach pain
• Chest pain, sudden weakness, severe headache, or stroke-like symptoms
• Reduced urination, severe dehydration, or signs of kidney problems
• Yellow skin or eyes, dark urine, severe fatigue, or right upper abdominal pain
• Severe rash, blistering, or mucosal lesions
• Rapidly spreading dental swelling, fever, trismus, or difficulty swallowing
• Pain that does not improve or becomes worse despite correct use

• Ibuprofen
• Paracetamol / Acetaminophen
• Naproxen
• Metamizole / Dipyrone
• Aspirin / Acetylsalicylic acid
• Diclofenac + Paracetamol combination approach

Diclofenac is a potent NSAID that may help selected patients with inflammatory dental pain and postoperative pain. Its safe use requires careful screening for cardiovascular disease, gastrointestinal bleeding risk, kidney disease, liver problems, NSAID-sensitive asthma, pregnancy, anticoagulant or antiplatelet therapy, and duplicate NSAID use. In dental care, diclofenac should be used selectively, for the shortest necessary time, and never as a substitute for diagnosis, source control, or referral when needed.