Methods: 20 healthy male subjects participated in a double-blind, randomised, incomplete-block 3-period cross-over trial involving 5 treatments (n=12 per group): placebo (PBO), modafinil 100 mg (MOD), and combinations THN102 (modafinil 100 mg and 1, 3 or 9 mg flecainide as THN1, THN3 and THN9), as 3 oral doses over 18h.