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, 9 February 2011: GW Pharmaceuticals (AIM: GWP) hereby provides notification that the Company has today been notified of the following share transactions entered into on 4 February 2011 by Mr Thomas Lynch, non-executive Director and Dr Geoffrey Guy, a Director and Executive Chairman of the Company.

Mr Thomas Lynch purchased 188,679 ordinary shares of 0.1p each from Dr Geoffrey Guy. This transaction between Directors, which equates to 0.14% of the issued ordinary share capital of the company, took place at the market price of 106 pence per share.

Following this notification:

Mr Lynch's holding in the shares of GW Pharmaceuticals PLC has increased to 236,344 ordinary shares of 0.1 pence each, amounting to 0.18% of shares in issue.

Dr Guy holds a beneficial interest in 18,068,104GW Pharmaceuticals plc ordinary shares of 0.1 pence each, representing 13.73% of the Company's current issued share capital.

The total number of shares outstanding in the Company is 131,549,592 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 Advisor) Tel: +44 (0)207 418 8900

James Steel/Vijay Barathan