We use a placebo for our double blinded study. The expiry date is Jan 2023 and we have received all documentation confirming that the placebo is deemed acceptable for an expiry extension for an additional 12 months of use. The IMPD for the placebo has date of manufacture of 02/2018 with a 60 month expiry. Therefore, extending the expiry date would exceed 60 months. Please could you advise?