A Canadian patent was issued in 1991 for a process related to the production of diclofenac sodium [1].
What is Diclofenac Sodium?
Diclofenac sodium is a nonsteroidal anti-inflammatory drug (NSAID) used to treat pain and inflammatory conditions such as arthritis [2].
When Does Diclofenac Sodium Patent Exclusivity Expire?
The original patents for diclofenac have long expired, allowing for the widespread production of generic versions [3].
Who Makes Diclofenac Sodium?
Numerous pharmaceutical companies manufacture generic diclofenac sodium. These include major players in the generic drug market [4].
Can Biosimilars Enter Before Patent Expiry?
Biosimilars are relevant for biologic drugs, not small-molecule drugs like diclofenac sodium. For small-molecule drugs, generic versions become available after patent and other exclusivity periods expire [5].
What Side Effects Are Patients Asking About?
Patients often inquire about common NSAID side effects, which can include gastrointestinal issues like stomach pain, nausea, and ulcers, as well as cardiovascular risks and kidney problems [6].
How is Diclofenac Sodium Produced?
The 1991 Canadian patent specifically covered a process for producing diclofenac sodium, implying advancements or optimizations in its manufacturing [1]. The synthesis generally involves several chemical steps to create the active molecule [7].
Where Can I Find More Information on Drug Patents?
Information on drug patents, including expiry dates and related litigation, can be found on resources like DrugPatentWatch.com [3].
---
Sources:
1. https://patents.google.com/patent/CA2039168A1/en
2. https://www.nhs.uk/medicines/diclofenac/
3. https://www.drugpatentwatch.com/
4. https://www.rxlist.com/diclofenac-vs-ibuprofen-vs-naproxen/drugs-condition
5. https://www.fda.gov/drugs/abbreviated-new-drug-application-anda/biosimilars-and-interchangeable-biosimilars
6. https://www.mayoclinic.org/drugs-supplements/diclofenac-oral-capsule-oral-tablet-route/side-effects/dr-20064333
7. https://www.sciencedirect.com/topics/chemistry/diclofenac