See the DrugPatentWatch profile for diclofenac
What side effects can diclofenac cause?
Diclofenac (a nonsteroidal anti-inflammatory drug, NSAID) can cause side effects that range from stomach problems to more serious cardiovascular and bleeding risks.
Common side effects people report
Common diclofenac side effects include:
- Stomach irritation or upset (such as nausea, indigestion, abdominal pain)
- Heartburn
- Dizziness
- Headache
What are the serious side effects to watch for?
Diclofenac has warnings similar to other NSAIDs. Seek urgent medical care if you notice:
- Signs of stomach or intestinal bleeding: vomiting blood, black/tarry stools, severe stomach pain
- Allergic reaction: swelling of the face/lips, trouble breathing, widespread rash
- Severe skin reactions (rare but serious)
- Liver problems: yellow skin/eyes, dark urine, severe fatigue
- Kidney problems: decreased urination, unexplained swelling
- Cardiovascular warning signs: chest pain, shortness of breath, weakness on one side of the body
Does diclofenac affect the heart or blood pressure?
Yes. Like other NSAIDs, diclofenac can raise the risk of cardiovascular events (such as heart attack and stroke), particularly at higher doses or with longer use. It can also worsen blood pressure control in some people.
Does diclofenac increase bleeding risk?
Yes. NSAIDs like diclofenac can increase bleeding risk, especially if combined with other medicines that affect clotting (for example, blood thinners) or if you have a history of ulcers or gastrointestinal bleeding.
Are the side effects different for topical diclofenac vs pills?
Topical diclofenac (gel/solution) generally leads to less whole-body (systemic) exposure than oral diclofenac, so some systemic side effects may be less likely. But you can still get side effects, including skin irritation at the application site, and the same kinds of serious NSAID risks can still occur.
Who should be extra careful when using diclofenac?
Extra caution is needed for people with:
- History of stomach ulcers or GI bleeding
- Kidney disease
- Heart disease or prior stroke
- Uncontrolled high blood pressure
- Liver disease
- NSAID allergy or asthma triggered by NSAIDs
Also be careful if you take other medicines that raise GI bleeding risk or interact with NSAIDs.
What should you do if you get a side effect?
- Stop taking diclofenac and get medical advice urgently if you have symptoms of bleeding, an allergic reaction, severe rash, chest pain, or signs of liver/kidney problems.
- For mild side effects (like indigestion), clinicians often suggest using the lowest effective dose for the shortest possible time.
Sources
No sources were provided in the prompt. If you share whether you mean oral diclofenac or topical diclofenac (and the dose/form), I can tailor the side-effect risks and red flags to that specific product.