Diclofenac

What is Diclofenac?

Diclofenac is a prescription (and, in some formulations and regions, over-the-counter) medication that belongs to a class of drugs called nonsteroidal anti-inflammatory drugs (NSAIDs). It works by reducing substances in the body that cause inflammation, pain, and fever.

Diclofenac is commonly prescribed or used for:

• Osteoarthritis and rheumatoid arthritis
• Ankylosing spondylitis and other inflammatory joint conditions
• Acute pain, including musculoskeletal injuries, sprains, and strains
• Menstrual pain (dysmenorrhea)
• Migraine relief, in certain formulations
• Localized joint or muscle pain, when using topical formulations
• Eye inflammation following certain eye surgeries, when using ophthalmic formulations

Available formulations: Diclofenac is available in a wide range of forms, including oral tablets and capsules (immediate and extended/delayed release), topical gels, patches, and solutions for localized pain, ophthalmic eye drops, and, in some clinical settings, injectable and suppository forms. Patients should confirm the exact formulation and strength prescribed or recommended with their healthcare provider and pharmacist.

What is the Recommended Dosage of Diclofenac?

Dosage of diclofenac depends on several factors, including:

• The condition being treated (chronic joint disease vs. acute pain)
• The formulation being used (oral, topical, ophthalmic, or injectable)
• The patient’s age and body weight
• Kidney and liver function
• Cardiovascular risk factors and other underlying health conditions
• Other medications being taken

Because dosing varies significantly based on the formulation, condition, and individual patient factors, this page does not provide specific dosing numbers. Only a licensed physician, rheumatologist, or other qualified healthcare provider can determine the correct dose, formulation, and duration of use for a given patient. Diclofenac should generally be used at the lowest effective dose for the shortest duration necessary.

How Diclofenac Works

Diclofenac works by blocking enzymes called cyclooxygenase (COX-1 and COX-2), which are involved in producing prostaglandins — substances in the body that contribute to inflammation, pain, and fever. By reducing prostaglandin production, diclofenac helps relieve pain and reduce inflammation and swelling.

Diclofenac manages the symptoms of pain and inflammation associated with various conditions; it does not cure the underlying disease process, such as the joint damage seen in arthritis. It is typically used as part of a broader treatment approach that may include other medications, physical therapy, or other interventions as determined by a healthcare provider.

Is a Prescription Required to Buy Diclofenac Online?

This depends on the specific formulation, strength, and region. Some low-strength topical diclofenac products are available over the counter in certain countries, while oral tablets, higher-strength topical products, and ophthalmic or injectable forms typically require a prescription. Patients should confirm the regulatory status of the specific product in their region.

Regardless of prescription status, it is advisable to consult a healthcare provider before starting diclofenac, particularly:

• A physician or rheumatologist for chronic joint or inflammatory conditions
• An ophthalmologist for eye-related use
• Any physician if there is a history of heart disease, stomach ulcers, kidney disease, or if other medications are being taken

Patients should be cautious of:

• Websites offering prescription-strength diclofenac without any medical oversight
• Unusually low prices, which may indicate counterfeit or substandard products
• Products marketed for veterinary or non-human use
• Sellers that are not licensed pharmacies

Diclofenac should only be obtained from a licensed pharmacy or authorized retailer to ensure the product is safe, authentic, and appropriately formulated.

Side Effects of Diclofenac

Common Side Effects

These vary by formulation but commonly include:

• Stomach upset, indigestion, or nausea
• Headache
• Dizziness
• Mild skin irritation, redness, or itching at the application site (topical forms)
• Temporary stinging or irritation (ophthalmic forms)

Serious Side Effects

Serious side effects are less common but require prompt medical attention:

• Signs of gastrointestinal bleeding or ulcers (black or bloody stools, vomiting blood, severe stomach pain)
• Signs of a heart attack or stroke (chest pain, shortness of breath, sudden weakness or numbness, difficulty speaking) — NSAIDs, including diclofenac, carry a risk of cardiovascular events, particularly with long-term or high-dose use
• Signs of kidney problems (decreased urination, swelling in the legs or ankles, unusual fatigue)
• Signs of liver problems (yellowing of the skin or eyes, dark urine, severe fatigue, loss of appetite)
• Signs of a severe allergic reaction (swelling of the face, lips, or throat; difficulty breathing; severe rash)
• Signs of a severe skin reaction (widespread rash, blistering, peeling skin)

Patients or caregivers should seek immediate medical attention if any of these serious symptoms occur. This list is not exhaustive, and any new or worsening symptoms should be reported to a healthcare provider promptly.

Drug Interactions

Diclofenac can interact with a range of other medications and substances, including:

• Blood thinners (anticoagulants) and antiplatelet medications, which may increase bleeding risk
• Other NSAIDs or aspirin, which may increase the risk of stomach and cardiovascular side effects
• Certain blood pressure medications, including ACE inhibitors, ARBs, and diuretics, which may be less effective or affect kidney function when combined with diclofenac
• Lithium and methotrexate, which may reach higher levels in the body when combined with diclofenac
• Corticosteroids, which may increase the risk of stomach ulcers when used together
• Over-the-counter medications, including other pain relievers and cold/flu products that may contain NSAIDs
• Herbal products and dietary supplements, including some that affect bleeding risk

Patients should provide their healthcare provider and pharmacist with a complete and current list of all prescription medications, over-the-counter drugs, vitamins, and herbal supplements before starting diclofenac.

Safety & Important Considerations

• Cardiovascular risk: NSAIDs, including diclofenac, may increase the risk of heart attack or stroke, particularly with long-term use or in patients with existing heart disease or risk factors. This risk should be discussed with a healthcare provider before starting treatment.
• Gastrointestinal risk: Diclofenac can increase the risk of stomach ulcers and bleeding, particularly in older adults, those with a history of ulcers, or those using other medications that increase bleeding risk.
• Kidney function: Diclofenac can affect kidney function, particularly with long-term use, dehydration, or in patients with existing kidney disease. Periodic monitoring may be recommended.
• Liver function: Periodic liver function testing may be recommended, particularly with long-term oral use.
• Pregnancy and breastfeeding: Diclofenac is generally not recommended during pregnancy, particularly in the third trimester, due to potential risks to the developing fetus. Patients who are pregnant, planning to become pregnant, or breastfeeding should discuss the risks and benefits with their healthcare provider.
• Age-related considerations: Older adults may be at higher risk for gastrointestinal, kidney, and cardiovascular side effects and may require closer monitoring or lower doses.
• Monitoring requirements: For long-term use, periodic blood pressure checks, kidney function tests, and liver function tests may be recommended.
• FDA safety information: Diclofenac and other NSAIDs carry labeling regarding cardiovascular and gastrointestinal risks. Patients should review the FDA-approved prescribing information or product labeling with their healthcare provider.

This medication should be used only for its approved indications, at the lowest effective dose for the shortest necessary duration.

Who This Medication Is For

Diclofenac is typically used by individuals experiencing pain and inflammation related to arthritis, musculoskeletal injuries, menstrual cramps, or other inflammatory conditions, as well as certain eye conditions requiring anti-inflammatory treatment. It is used across a wide age range of adults, with use in children generally limited to specific formulations and conditions under specialist guidance.

Who Should Not Take Diclofenac

Diclofenac may not be appropriate for individuals who:

• Have a known hypersensitivity or allergic reaction to diclofenac, aspirin, or other NSAIDs
• Have a history of asthma, hives, or allergic reactions triggered by aspirin or other NSAIDs
• Are in the late stages of pregnancy (third trimester)
• Have active or a history of recurrent stomach ulcers or gastrointestinal bleeding
• Have severe heart failure or are recovering from recent heart bypass surgery
• Have severe kidney or liver impairment, unless specifically directed and closely monitored by a healthcare provider

This is not a complete list of contraindications. A licensed healthcare provider must review a patient’s full medical history before prescribing or recommending diclofenac.

What to Do If You Miss a Dose

If a dose of diclofenac is missed, patients should generally take or apply it as soon as they remember, unless it is close to the time of the next scheduled dose, in which case the missed dose is typically skipped.

Patients should never take or apply two doses at once to make up for a missed dose. If there is any uncertainty about what to do after a missed dose, patients or caregivers should contact a healthcare provider or pharmacist for guidance.

Alternatives to Diclofenac

Alternatives to Diclofenac depend on the condition being treated: joint pain, arthritis, muscle pain, dental pain, menstrual pain, eye inflammation, or post-surgery pain. Diclofenac is an NSAID, so many alternatives are other NSAIDs, but they carry similar stomach, kidney, blood pressure, and heart-risk concerns. (nhs.uk)

Alternatives to Diclofenac

Use Case	Possible Alternatives	Notes
General pain and inflammation	Ibuprofen, Naproxen, Aceclofenac, Etoricoxib, Celecoxib	These are common NSAID alternatives. They may help pain and swelling, but they are not suitable for everyone.
Osteoarthritis / joint pain	Topical NSAID gel, Ibuprofen gel, Naproxen, Celecoxib, Etoricoxib, Acetaminophen	NICE recommends topical NSAIDs for knee osteoarthritis and says they may be considered for hand osteoarthritis. (NICE)
Muscle pain / sprain / strain	Ibuprofen gel, Diclofenac-free topical NSAID gel, Menthol gel, Capsaicin cream, Acetaminophen	Topical options may be preferred when the pain is localized.
Dental pain	Ibuprofen, Naproxen, Acetaminophen	Dental pain may need dental treatment, not only pain medicine. Avoid using multiple NSAIDs together.
Menstrual cramps	Ibuprofen, Naproxen, Mefenamic Acid	NSAIDs are commonly used for period pain, but they should be avoided in some stomach, kidney, heart, and bleeding-risk conditions.
High stomach-risk patients	Acetaminophen, topical NSAIDs, Celecoxib with doctor guidance, non-drug therapy	NSAIDs such as diclofenac can cause stomach ulcers, bleeding, or holes in the stomach or intestine. (MedlinePlus)
Heart disease / stroke-risk patients	Acetaminophen, topical treatments, physical therapy, specialist-guided options	Diclofenac has important cardiovascular warnings, including increased heart attack and stroke risk, especially in higher-risk patients. (GOV.UK)
Eye inflammation after surgery	Ketorolac eye drops, Nepafenac eye drops, Bromfenac eye drops	These are ophthalmic NSAID alternatives and should be used only as prescribed.

NSAID alternatives:

• Ibuprofen
• Naproxen
• Aceclofenac
• Mefenamic Acid
• Ketoprofen
• Piroxicam
• Celecoxib
• Etoricoxib

Non-NSAID pain options:

• Acetaminophen / Paracetamol
• Tramadol, only when prescribed
• Lidocaine patches or gel
• Capsaicin cream

Topical alternatives:

• Ibuprofen gel
• Ketoprofen gel
• Capsaicin cream
• Menthol-based gel
• Lidocaine topical products

Eye-drop alternatives:

• Ketorolac
• Nepafenac
• Bromfenac

Important Safety Note

Do not combine diclofenac with other NSAIDs such as ibuprofen, naproxen, aspirin for pain relief, celecoxib, or etoricoxib unless a doctor specifically advises it. NSAIDs may not be suitable for people with a history of stomach ulcer, kidney disease, heart disease, high blood pressure, asthma triggered by NSAIDs, pregnancy, or blood thinner use. NHS also warns that diclofenac may not be suitable for people allergic to aspirin or other NSAIDs such as ibuprofen or naproxen. (nhs.uk)

Storage Instructions

• Store at room temperature, generally between 68°F and 77°F (20°C to 25°C), unless otherwise directed on the label.
• Keep the medication in its original container, protected from excess moisture and light.
• Keep topical gels and patches tightly closed or sealed when not in use.
• Keep out of reach of children and pets at all times, ideally in a locked or secured location.
• Do not use diclofenac past its expiration date, and dispose of unused medication according to pharmacist or local guidelines rather than discarding it in household trash.

Disclaimer

This page is for educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Patients must consult a licensed physician, rheumatologist, or other relevant medical specialist before starting, changing, or stopping treatment with diclofenac. Treatment decisions must be based on a full clinical evaluation by a qualified specialist.