Director/PDMR Shareholding

GW Pharmaceuticals PLC

GW Pharmaceuticals PLC ("GW Pharmaceuticals" or the "Company")

NOTIFICATION OF INTERESTS OF DIRECTORS AND CONNECTED PERSONS

Porton Down, UK, 25 March 2011: GW Pharmaceuticals (AIM: GWP) hereby provides notification that the Company has today been notified that on 24th March 2011 Dr Geoffrey Guy, a Director and Executive Chairman of the Company transferred 15,365 ordinary shares of 0.1 pence each, equating to less than 0.02% of the issued share capital, into his personal pension scheme. This transaction took place at the market price of 103.9 pence per share.

Following this notification Dr Guy's beneficial interest in 18,068,104 GW Pharmaceuticals plc ordinary shares of 0.1 pence each, representing 13.72% of the Company's current issued share capital, remains unchanged.

The total number of shares outstanding in the Company is 131,685,092 ordinary shares of 0.1 pence each.

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Enquiries:

GW Pharmaceuticals PLC Tel: +44 (0)1980 557 000

Adam George, Company Secretary

Peel Hunt LLP (Nominated Adviser) Tel: +44 (0)207 418 8900

James Steel/Vijay Barathan