Forecasting branded and generic pharmaceuticals

Nikolopoulos, Konstantinos, Buxton, Samantha, Khammash, Marwan and Stern, Philip (2016) Forecasting branded and generic pharmaceuticals. International Journal of Forecasting, 32 (2). pp. 344-357. ISSN 0169-2070

[img] PDF - Published Version
Restricted to SRO admin only

Download (968kB)


We forecast UK pharmaceutical time series before and after the time of patent expiry. This is a critical point in the lifecycle, as a generic form of the product is then introduced into the market, while the branded form is still available for prescription. Forecasting the numbers of units of branded and generic forms of pharmaceuticals dispensed is becoming increasingly important, due to their huge market value and the limited number of new ‘blockbuster’ branded drugs, as well as the imposed cost for national healthcare systems like the NHS. In this paper, eleven methods are used to forecast drug time series, including diffusion models (Bass model & RPDM), ARIMA, exponential smoothing (Simple and Holt), naïve and regression methods. ARIMA and Holt produce accurate short term (annual) forecasts for branded and generic drugs respectively, while for the more strategic horizons of 2–5 years ahead, naïve with drift provides the most accurate forecasts.

Item Type: Article
Keywords: Pharmaceuticals forecasting, Diffusion models, New products, Branded, Generics
Schools and Departments: School of Business, Management and Economics > Business and Management
Subjects: H Social Sciences > HF Commerce > HF5001 Business > HF5410 Marketing. Distribution of products
Depositing User: Marv Khammash
Date Deposited: 30 Aug 2016 08:47
Last Modified: 13 Mar 2017 11:46

View download statistics for this item

📧 Request an update