What is diclofenac? The active ingredient and its different forms

The active ingredient and its effect

Diclofenac acts through mechanisms that reduce the production of prostaglandins involved in pain and inflammation. It is found in products used for various musculoskeletal and rheumatic symptoms. Expected benefit depends on the clinical situation and the appropriate product. Relief of a symptom does not necessarily mean that its underlying cause has resolved.

Potassium, sodium and formulation

Diclofenac potassium and diclofenac sodium are different salt forms of the same active ingredient. Release characteristics, coatings and the route of administration also matter. The salt name alone does not establish that a product is stronger, safer or faster for everyone. Products should not be interchanged outside their specific instructions without professional advice.

Systemic and skin-applied forms

Oral and injectable forms may act throughout the body; this is described as systemic use. Gels and other preparations applied to the skin have different conditions of use. Skin application does not eliminate every possibility of side effects. Availability without a prescription for one form in another country does not determine the status or instructions of a different product in Türkiye.

Important safety considerations

A history of gastrointestinal ulcer or bleeding, kidney, liver or cardiovascular disease, medicine allergy, pregnancy or breastfeeding requires consideration. Cardiovascular risks with systemic diclofenac are particularly relevant with higher exposure and prolonged use. Expected benefit and individual risk are assessed together; the same level of risk is not assumed for every person.

Nausea, abdominal discomfort or a rash can occur. Breathing difficulty, throat swelling, vomiting blood, black tar-like stools, chest pain or sudden neurological symptoms require emergency assessment. This short overview is not a complete set of warnings. The approved leaflet for the actual product remains the relevant source of instructions.

Reviewing other treatments

Two products containing the same ingredient, or another pain medicine from the same group, may be taken together unintentionally. Other treatments, including anticoagulants and some blood pressure medicines, also matter. A current list of medicines and supplements helps a doctor or pharmacist assess the situation. This page explains the ingredient rather than selecting a product or a personal dose.