What is Diclofenac?
Diclofenac is a nonsteroidal anti-inflammatory drug (NSAID) used worldwide to relieve pain and inflammation. It helps treat conditions like arthritis, muscle sprains, migraine, and painful menstruation. It works by blocking the action of certain enzymes that cause swelling and pain, as explained by the National Library of Medicine.
Sodium or Potassium: What's the Difference?
The active molecule is the same, but the salt attached changes how quickly the drug dissolves. Diclofenac potassium is absorbed more quickly and provides faster relief for acute pain. Diclofenac sodium tends to last longer in the system, giving a more prolonged effect. This is why potassium is often preferred for sudden pain attacks.
Speed of Absorption
According to a study in the Postgraduate Medical Journal, some potassium formulations can be absorbed faster than sodium ones, which makes them effective for short-term pain. However, the speed also depends on tablet design, whether you take it with food, and your individual metabolism. Always follow your doctor's instructions.
Dosing Recommendations
The right dose varies by age, condition, and product. Mayo Clinic warns that different forms are not always interchangeable milligram-for-milligram. The National Library of Medicine gives these typical adult doses:
| Form | Usual Adult Dose |
|---|---|
| Diclofenac sodium | 100-150 mg per day for certain chronic inflammatory conditions |
| Diclofenac potassium | 25-50 mg taken 1 to 4 times a day (total 50-200 mg/day) |
MedlinePlus stresses to take exactly what your doctor prescribes. Do not increase the dose or continue treatment on your own. Use the lowest effective dose for the shortest time.
Shared Risks & Precautions
- Cardiovascular risk: Diclofenac may increase the chance of heart attack or stroke, especially with higher doses, long-term use, or pre-existing heart disease.
- Gastrointestinal risk: It can cause ulcers, bleeding, or stomach perforation, sometimes without warning. This risk is higher for older adults, or those also taking anticoagulants, steroids, or who smoke.
- Hepatic and kidney effects: It can raise liver enzymes, cause fluid retention, worsen kidney function, or increase blood pressure. People with kidney or liver issues should be monitored closely.
Additionally, diclofenac sodium adds a bit of extra sodium to your body, which may affect individuals with salt-sensitive hypertension. A PubMed study warns that such small sodium loads could contribute to cardiovascular events in sensitive people.