Irfen (Diclofenac Diethylamine)

Diclofenac diethylamine is a topical NSAID used to treat conditions involving inflammation and pain in the musculoskeletal system.

• Musculoskeletal pain: provides localized analgesia and reduces inflammation at the application site.
• Inflammatory conditions: diminishes swelling and erythema associated with soft‑tissue inflammation.
• Arthritis: alleviates joint discomfort and stiffness in osteoarthritis or rheumatoid arthritis when applied to affected areas.

• Diclofenac diethylamine inhibits cyclooxygenase‑1 (COX‑1) and cyclooxygenase‑2 (COX‑2) enzymes in peripheral tissues, leading to reduced synthesis of prostaglandins that mediate inflammation, pain, and fever. By limiting prostaglandin production locally, the topical formulation decreases vascular permeability, edema, and nociceptor sensitization, resulting in analgesic and anti‑inflammatory effects at the site of application.

Topical diclofenac may cause skin‑related reactions, ranging from mild irritation to rare severe dermatologic events.

Common Side Effects

• Burning sensation: transient warmth or stinging at the application site.
• Itching: mild pruritus localized to the treated area.
• Redness: erythema that usually resolves within hours.
• Dry skin: mild desquamation or flaking.
• Rash: localized papular eruption.
• Peeling: superficial skin shedding.

Serious or Rare Side Effects

• Allergic dermatitis: severe itching, swelling, or blistering.
• Stevens‑Johnson syndrome: rare but life‑threatening skin reaction.
• Necrotizing fasciitis: extremely rare deep tissue infection.
• Systemic NSAID toxicity: unlikely but possible if large areas are applied.
• Severe photosensitivity: heightened reaction to sunlight.
• Anaphylaxis: acute systemic allergic response.

When using Irfen, consider the following safety measures.

• Avoid use on broken or infected skin: may increase systemic absorption and infection risk.
• Limit application area: do not exceed the recommended surface area to reduce systemic exposure.
• Do not combine with other topical NSAIDs: increases risk of adverse skin reactions.
• Consult a healthcare professional if using oral anticoagulants or systemic NSAIDs: monitor for bleeding or additive toxicity.
• Store at room temperature: keep in the original container, protect from moisture and direct heat.

Topical diclofenac can interact with systemic medications and other topical agents.

Major Interactions (Avoid)

• Concurrent oral NSAIDs: heightened risk of systemic NSAID‑related adverse effects.
• Anticoagulants (e.g., warfarin): increased bleeding tendency.
• Lithium therapy: potential elevation of lithium serum levels.
• Methotrexate: possible augmentation of methotrexate toxicity.

Moderate Interactions (Monitor Closely)

• Corticosteroid creams: may increase skin thinning when used together.
• Diuretics: monitor renal function if large skin areas are treated.
• ACE inhibitors: watch for rare renal impairment.
• SSRIs or SNRIs: observe for any signs of increased bleeding.