Interestingly, this is something that is never included in the prescribing information. Individual packs are labeled with an expiry date specific to an individual batch.
If you needed to know the time between the date of manufacture and the date of expiry, you could contact Pfizer (who manufacture Chantix) http://www.pfizer.com/contact/
- Varenicline Information for Consumers
- Varenicline Information for Healthcare Professionals (includes dosage details)
- Side Effects of Varenicline (detailed)
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