Diclofenac sodium is an NSAID. Like other NSAIDs, it can cause a range of side effects. Most people have no or only mild effects, but some can be serious. Here’s a practical summary:
Common (usually mild)
- Stomach upset: nausea, indigestion, heartburn, abdominal pain
- Diarrhea or constipation
- Dizziness or headache
- Mild rash or itching
- Fluid retention or swelling (edema), especially with higher doses or long use
Less common
- Vomiting
- Dizziness or fatigue
- Rash or other skin reactions
Serious (requires urgent medical attention)
- GI bleeding or ulcers: black/tarry stools, vomiting blood, severe stomach pain
- Signs of liver injury: yellowing of eyes/skin, dark urine, persistent nausea/vomiting
- Kidney problems: decreased urine, swelling, shortness of breath
- Severe allergic reactions: swelling of face/t hands/tongue, trouble breathing, severe skin reactions
- Heart and blood vessels: chest pain, weakness on one side of body, trouble speaking, sudden severe headache (possible heart attack or stroke)
- Severe skin reactions (rare): widespread blistering or peeling skin, mucous membrane involvement
Notes and safety tips
- Take the lowest effective dose for the shortest possible time.
- Take with food or milk to reduce stomach upset; avoid alcohol if possible.
- People with a history of ulcers, GI bleeding, kidney or liver disease, heart disease, or those taking blood thinners or other NSAIDs may have higher risk—discuss with your clinician.
- Topical diclofenac (gel/cream) tends to have fewer systemic side effects, but can cause local skin reactions at the application site.
- Pregnancy: NSAIDs are generally avoided in the third trimester; consult your obstetrician if you’re pregnant or planning to become pregnant.
- If you miss a dose, take it as soon as you remember unless it’s almost time for the next dose. Do not double up.
If you have a specific formulation (e.g., diclofenac sodium 50 mg tablets) or a medical condition, I can tailor the side‑effect info. If you experience any warning signs of serious reactions, seek medical care promptly. Always follow your healthcare provider’s guidance.