under these conditions , phenobarbital increased transmitter release in high external k+ ( 7.5 mm ) ( 1.8 mm ca++ , no mg++ ) and in normal k+ ( 2.5 mm ) ( 1.8 mm ca++ , no mg++ ) to the same magnitude ( 130 % of control ) in contrast to the reported effects of primidone and pema .
C0031412
phenobarbital
C0033148
primidone