What Is Diclofenac, and What Does It Treat?

Diclofenac is a nonsteroidal anti-inflammatory drug (NSAID) commonly prescribed to relieve pain, reduce inflammation, and lower fever. You’ve likely heard the phrase “what is diclofenac” when researching options for managing aches, joint stiffness, or postoperative discomfort. Below, we’ll explain how diclofenac works, its common uses, potential side effects, and essential safety tips.

How Diclofenac Works

Diclofenac inhibits enzymes called cyclooxygenases (COX-1 and COX-2), which play a key role in producing prostaglandins. Prostaglandins are hormone-like substances that:

• Promote inflammation
• Cause pain signals to reach the brain
• Raise body temperature during fever

By blocking these enzymes, diclofenac helps to:

• Reduce the chemicals that trigger pain and inflammation
• Alleviate swelling and tenderness in affected tissues
• Lower fever in moderate cases

Common Uses of Diclofenac

Diclofenac treats a range of pain and inflammatory conditions. Your doctor may prescribe it in oral, topical (gel/patch), or injectable forms depending on your situation. Typical uses include:

• Arthritis
  • Osteoarthritis (wear-and-tear joint pain)
  • Rheumatoid arthritis (autoimmune joint inflammation)
  • Ankylosing spondylitis (spinal joint inflammation)
• Musculoskeletal Injuries
  • Sprains, strains, and bruises
  • Tendonitis and bursitis
• Postoperative Pain
  • After dental surgery, orthopedic procedures, or soft-tissue surgery
• Menstrual Pain (Dysmenorrhea)
  • Relieves cramping and discomfort
• Migraine Attacks
  • Short-term relief when taken early in the headache phase

Available Forms and Strengths

Diclofenac comes in several formats. Your healthcare provider will choose the most suitable one:

• Oral Tablets/Capsules
  • Immediate-release: taken two to three times daily
  • Extended-release: taken once daily
• Topical Gels and Patches
  • Applied directly to the skin over painful joints or muscles
• Suppositories
  • An alternative if nausea or vomiting make oral dosing difficult
• Injections
  • Administered by a healthcare professional for acute pain relief

Dosage Guidelines

Dosage depends on the condition, form of diclofenac, and your overall health. General guidelines:

• Adults: 50–150 mg per day in divided doses (oral)
• Topical: Apply a thin layer 2–4 times per day; do not exceed the recommended area
• Always follow your doctor’s instructions or the prescription label

Never exceed the prescribed dose or take it longer than recommended without consulting your doctor.

Potential Side Effects

Like all NSAIDs, diclofenac can cause side effects. Many people tolerate it well, but be aware of these possibilities:

• Common (mild to moderate)
  • Upset stomach, indigestion, heartburn
  • Headache, dizziness
  • Skin rash or itching (topical use)
• Less Common (seek medical advice)
  • Nausea, vomiting
  • Fluid retention and swelling (edema)
  • Increased blood pressure
• Serious (seek immediate help)
  • Signs of gastrointestinal bleeding: black, tarry stools or vomiting blood
  • Chest pain, shortness of breath, weakness on one side of the body
  • Severe skin reactions: blistering, peeling, or rash covering large areas
  • Yellowing of the skin or eyes (jaundice)

If you experience any life-threatening or serious symptoms, speak to a healthcare professional right away.

Warnings and Precautions

Before starting diclofenac, discuss your medical history with a doctor, especially if you have:

• Heart disease, high blood pressure, or a history of stroke
• Stomach or intestinal ulcers, bleeding disorders
• Kidney or liver problems
• Asthma triggered by NSAIDs
• An allergy to aspirin or other NSAIDs

Long-term use or high doses can raise the risk of heart attack, stroke, and gastrointestinal bleeding. Your doctor will weigh the benefits and risks based on your health profile.

Drug Interactions

Diclofenac can interact with other medications, potentially altering their effects or increasing side-effect risks. Common interactions include:

• Anticoagulants (blood thinners): warfarin, dabigatran
• Other NSAIDs or corticosteroids: higher risk of ulcers and bleeding
• ACE inhibitors and ARBs: possible reduced blood-pressure control
• Diuretics (“water pills”): risk of kidney function changes
• Lithium and methotrexate: increased blood levels of these drugs

Always disclose all prescription, over-the-counter, and herbal supplements you’re taking to your doctor or pharmacist.

Tips for Safe Use

To get the most benefit and minimize risks with diclofenac:

• Take with food or milk to reduce stomach upset.
• Use the lowest effective dose for the shortest time needed.
• Do not crush or chew extended-release tablets.
• Avoid alcohol—combining with diclofenac can increase the risk of gastrointestinal bleeding.
• Check your blood pressure regularly if you take diclofenac long-term.
• Store at room temperature, away from moisture and heat.

Special Populations

• Older Adults (65+ years)
  • May be more prone to side effects like bleeding, kidney problems, or low blood pressure.
• Pregnancy
  • Avoid during the third trimester; discusses risks and benefits with your obstetrician.
• Breastfeeding
  • Small amounts may pass into breast milk; consult your doctor.
• Children
  • Certain formulations are approved for juvenile arthritis; dosing must be precise.

Monitoring and Follow-Up

If you’re on diclofenac for chronic conditions such as arthritis, your doctor may schedule regular check-ups to:

• Monitor blood pressure, kidney, and liver function
• Screen for signs of gastrointestinal bleeding
• Adjust the dose as needed

How to Know If You Need Medical Attention

While mild side effects often resolve on their own, seek immediate care for:

• Severe stomach pain or bloody stools
• Chest pain, difficulty breathing, sudden weakness
• Signs of an allergic reaction: swelling of the face, lips, tongue, or throat
• Yellowing of the skin or eyes

If you’re ever unsure how serious your symptoms are, consider a free, online symptom check, using the doctor approved Ubie Symptom Checker. It can help you understand whether you should see a doctor right away.

Alternatives to Diclofenac

Depending on your health needs, your healthcare provider might suggest:

• Other NSAIDs (ibuprofen, naproxen)
• Acetaminophen for mild pain without anti-inflammatory action
• Topical pain relievers (capsaicin, lidocaine)
• Physical therapy, exercise, weight loss (for osteoarthritis)
• Disease-modifying antirheumatic drugs (DMARDs) for rheumatoid arthritis

When to Talk to a Doctor

Diclofenac can be helpful, but it’s not right for everyone. Speak to your doctor if you:

• Have a history of heart, stomach, liver, or kidney issues
• Are pregnant, planning pregnancy, or breastfeeding
• Are considering long-term treatment
• Notice any unusual symptoms or side effects

Never ignore symptoms that feel serious. Always seek medical help for anything life-threatening or severe.

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Diclofenac is a powerful tool against pain and inflammation when used correctly under medical supervision. Understanding “what is diclofenac” and how it treats various conditions empowers you to make informed choices about your health. Always talk to a healthcare professional before starting or changing any medication. If in doubt, consider a free, online symptom check, using the doctor approved Ubie Symptom Checker to guide your next step in care.