Diclofenac are NSAIDs used for pain and inflammation. Side effects can vary by formulation (oral tablet/capsule, extended-release, gel/patch, or other topical forms). Here’s a practical overview:
Common side effects (often mild)
- Stomach upset: heartburn, indigestion, abdominal pain, nausea, diarrhea or constipation
- Headache or dizziness
- Mild dizziness or fatigue
- Local skin irritation with topical forms (rash, itching, burning where applied)
Less common but possible
- Gas, belching
- Dry mouth, ringing in the ears (rare)
- Dizziness or lightheadedness
Serious (seek medical care urgently)
- Signs of GI bleeding or ulcers: black tarry stools, vomiting blood or dark/red vomit, severe or persistent stomach pain
- Severe allergic reaction: trouble breathing, swelling of face/throat, hives
- Chest pain, weakness, confusion, trouble speaking (possible heart-related event)
- Signs of liver problems: yellowing of eyes/skin, dark urine, severe fatigue, upper right abdominal pain
- Signs of kidney problems: sudden swelling of ankles/feet, unusual fatigue, little/no urination
- Severe skin reactions: blistering or peeling of skin, fever, flu-like symptoms
- Severe skin or mucous membrane reactions (rare)
Special considerations
- Cardiovascular risk: NSAIDs may increase risk of heart attack or stroke, especially with long-term use, higher doses, or in people with existing heart disease.
- GI risk: higher risk of ulcers and bleeding, particularly with older age, history of ulcers, or concurrent steroids/anticoagulants.
- Kidney and liver function: can affect kidneys and liver, especially with preexisting disease or high/long-term dosing.
- Pregnancy: generally avoided in the later stages of pregnancy. Talk to a healthcare provider about safety if you’re pregnant or planning to become pregnant, or if you’re breastfeeding.
- Topical diclofenac (gel/patch): fewer systemic effects, but can cause local skin irritation. Less likely to affect the stomach or kidneys, but still possible with widespread or prolonged use.
Tips
- Don’t take with other NSAIDs (including ibuprofen or naproxen) unless advised by a clinician.
- Take with food or a full glass of water to reduce stomach upset, if your doctor has not instructed otherwise.
- If you have a history of ulcers, kidney or liver disease, heart disease, high blood pressure, or are taking blood thinners or steroids, tell your clinician before starting diclofenac.
- If you miss a dose or have questions about dosing, contact your clinician or pharmacist.
If you’d like, tell me which diclofenac form you’re asking about (oral vs topical) and any medical history or other meds, and I can tailor the side effects to that situation. Always consult a healthcare provider for personalized advice.