It'll probably work, but won't be as potent.
They have to put a best before date on everything...like food...the chips will still be good and safe to eat, but they won't be as fresh.
I have a bottle of aspirin that "expired" last year, but they still work.
Still, it's best to ask a pharmacist. Just call one up and ask about the shelf life of the product. There ARE some meds that won't work, and others that can make you sick if expired.
Most products with expiration dates have some lee way built into the date. If it has not been stored properly, I would say no. If it has been stored properly, it is getting close to what I consider the end of its viability. I usually assume meds within 6 months of their expiration date are okay. After that, I throw them out. That is my personal practice.
Meds either concentrate or weaken as they age. The trouble is that as a consumer we rarely know which way a specific drug goes. But with the manufacturer's built in "cushion", I think you should be alright if you use the patches within the next few weeks.
The Content on this Site is presented in a summary fashion, and is intended to be used for educational and entertainment purposes only. It is not intended to be and should not be interpreted as medical advice or a diagnosis of any health or fitness problem, condition or disease; or a recommendation for a specific test, doctor, care provider, procedure, treatment plan, product, or course of action. Med Help International, Inc. is not a medical or healthcare provider and your use of this Site does not create a doctor / patient relationship. We disclaim all responsibility for the professional qualifications and licensing of, and services provided by, any physician or other health providers posting on or otherwise referred to on this Site and/or any Third Party Site. Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site. We offer this Site AS IS and without any warranties. By using this Site you agree to the following Terms and Conditions. If you think you may have a medical emergency, call your physician or 911 immediately.