You should talk with your healthcare provider prior to using the diclofenac patch if you have:
- Heart disease, including congestive heart failure
- High blood pressure (hypertension)
- Liver disease or liver failure
- Kidney disease or kidney failure
- Bleeding problems (or are taking blood-thinning medications)
- Stomach ulcers, stomach bleeding, or a history of these problems
- Had recent open heart surgery
- Any allergies, including allergies to medications, foods, dyes, or preservatives.
Also, let your healthcare provider know if you are:
- Pregnant or thinking of becoming pregnant (see Flector and Pregnancy)
- Breastfeeding (see Flector and Breastfeeding).
Make sure to tell your healthcare provider about all other medicines you are taking, including prescription and non-prescription medicines, vitamins, and herbal supplements.
(Click Precautions and Warnings With the Diclofenac Patch to learn more, including information on who should not take the drug.)
The diclofenac patch contains diclofenac, a nonsteroidal anti-inflammatory drug (NSAID). Like other NSAIDs, it works by blocking a specific enzyme known as cyclooxygenase (COX), blocking the production of various inflammatory substances in the body. However, because it works mostly where it is applied (only a small fraction of the medication actually reaches the rest of the body), the diclofenac patch helps to lower the exposure to the rest of the body (which may decrease the risk of dangerous side effects).