Zonisamide Patent Expiration

Zonisamide is Used for controlling seizures. It was first introduced by Advanz Pharma (Us) Corp in its drug Zonegran on Mar 27, 2000. Another drug containing Zonisamide is Zonisade. 20 different companies have introduced drugs containing Zonisamide.


Zonisamide Patents

Given below is the list of patents protecting Zonisamide, along with the drug name that holds that patent and the company name owning that drug.

Drug Used in Drug Patent Number Drug Patent Title Drug Patent Expiry Drug Owner
Zonisade US11478456 Oral pharmaceutical composition comprising Zonisamide and process of preparation thereof Aug 18, 2038 Azurity
Zonisade US11529333 Oral pharmaceutical composition comprising zonisamide and process of preparation thereof Aug 18, 2038 Azurity



A patent's expiry date may change depending upon legal activities going on that patent. Critical activities like abandoning of a patent, term extension of a patent or amendment of its claims can increase or decrease the life of a patent hence affecting its expiry date and in turn affecting the generic launch date of that drug. Tracking these ongoing activities on a patent application helps to keep an eye on the latest developments in the patent process of the drug which can give an idea of how early a drug's generic could be available. The next section provides a list of recent legal activities on Zonisamide's patents.

Given below is the list recent legal activities going on the following patents of Zonisamide.

Activity Date Patent Number
Patent litigations
Recordation of Patent Grant Mailed 20 Dec, 2022 US11529333
Patent Issue Date Used in PTA Calculation 20 Dec, 2022 US11529333
Email Notification 01 Dec, 2022 US11529333
Issue Notification Mailed 30 Nov, 2022 US11529333
Application Is Considered Ready for Issue 23 Nov, 2022 US11529333
Dispatch to FDC 23 Nov, 2022 US11529333
Issue Fee Payment Verified 02 Nov, 2022 US11529333
Issue Fee Payment Received 02 Nov, 2022 US11529333
Recordation of Patent Grant Mailed 25 Oct, 2022 US11478456
Patent Issue Date Used in PTA Calculation 25 Oct, 2022 US11478456


Zonisamide's Family Patents

Family Patents

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Zonisamide Generic API Manufacturers

Several generic applications have been filed for Zonisamide. The first generic version for Zonisamide was by Roxane Laboratories Inc and was approved on Dec 22, 2005. And the latest generic version is by Macleods Pharmaceuticals Ltd and was approved on May 12, 2025.

Given below is the list of companies who have filed for Zonisamide generic, along with the locations of their manufacturing plants worldwide.