Director/PDMR Shareholding

GW Pharmaceuticals PLC Director/PDMR Shareholding

GW Pharmaceuticals PLC

14 September 2011

GW Pharmaceuticals PLC

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

NOTIFICATION OF INTERESTS OF DIRECTORS AND CONNECTED PERSONS

Porton Down, UK, 14 September 2011: GW Pharmaceuticals (AIM: GWP) hereby provides notification that the Company was yesterday notified of the following series of transactions in the ordinary shares of 0.1 pence each of the Company entered into by Dr Geoffrey Guy, a Director and Executive Chairman of the Company.

On 8th September Dr Guy transferred 16,600 ordinary shares of 0.1 pence each, representing less than 0.1% of the Company's current issued share capital, into his personal pension scheme. This transaction was completed at a price of 107.75 pence per share.

In addition, on 8th September, Dr Guy gifted, for nil consideration, 261,000 ordinary shares of 0.1 pence each to two family members.

On 9th September Dr Guy gifted, for nil consideration, 125,000 ordinary shares of 0.1 pence each to a charity.

On 12th September, Dr Guy made a further gift of 50,000 ordinary shares of 0.1 pence each to a 2nd charity, again for nil consideration.

In total, the 436,000 shares gifted represent 0.3% of the Company's current issued share capital. These transactions took place when the market price of the shares was within the range of 101 pence to 107.75 pence.

Following this notification, Dr Guy retains a beneficial interest in 17,552,654 GW Pharmaceuticals plc ordinary shares of 0.1 pence each, representing 13.2% of the Company's current issued share capital.

The total number of shares outstanding in the Company is 133,000,354 ordinary shares of 0.1 pence each.

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