Dehydroabietic acid derivatives according to Formula Ia or Formula Ib and all stereoisomers thereof, having a linker chain A of 1 to 10 atoms selected from carbon, nitrogen and oxygen to a group X capable of being negatively charged at a physiological pH and covalently attached to the linker chain A, selected from carboxyl, sulfate, sulfonate and phosphate groups. The Dehydroabietic acid derivatives are useful for therapeutic treatment of hyperexcitability diseases