The global patent for tigecycline injection has not been extended based on the provided sources. The information from Drug Patent Watch, the US Patent and Trademark Office, and the European Patent Office does not indicate any patent term extensions for tigecycline injection. Therefore, the patent for tigecycline injection remains unchanged as per the available data.

Sources:
[1] drugpatentwatch.com/p/tradename/TIGECYCLINE
[2] uspto.gov/patents/laws/patent-term-extension/patent-terms-extended-under-35-usc-156
[3] epo.org/en/boards-of-appeal/decisions/t121422eu1