The invention relates to solid retigabine in non-crystalline form together with a surface stabiliser in the form of a stable intermediate. In the intermediate of the invention, retigabine is preferably present in amorphous form or in the form of a solid solution. The invention further relates to processes for the production of retigabine in a solid, non-crystalline form and to pharmaceutical formulations containing solid, non-crystalline retigabine.
