When does tigecycline's patent extension take effect?

Tigecycline’s patent extension “effective” date depends on which specific patent/patent family and which country you mean. Patent term extensions are granted by individual jurisdictions (e.g., FDA/US patent term adjustments for the U.S., SPCs for the EU), and the timing can differ.

If you tell me (1) the country (US/EU/UK/etc.) and (2) the specific product (tigecycline/brand—Tygacil) and patent number or application, I can pinpoint the exact “take effect” date.

In the meantime: in the U.S., a common way extensions/timing shows up is as FDA “Patent Term Extension/Adjustment” timelines (often reflecting patent term adjustment due to regulatory review), which is published in FDA/USPTO records for specific patents. In the EU, it’s typically an SPC (Supplementary Protection Certificate) effective date.

Reply with the jurisdiction and (if you have it) the patent/SPC identifier, and I’ll give you the precise effective date.