What are peak sales?

Peak sales are an estimate of how much a drug’s sales will be at the time when it is selling the most during its lifecycle. Peak sales estimates are usually tabulated for a given year and are derived using forecasting exercises. The time at which a drug reaches its peak sales can depend on a number of different variables including but not limited to expected launch trajectory, potential for follow-on indications, competitive landscape, and exclusivity status (eg patent term, regulatory exclusivity, etc).