Healthy , White , male volunteers ( n = @ ) who were not poor metabolizers of CYP@C@ were randomized to treatment A ( single-dose @ mg omeprazole on days @ and @ together with @ days of multiple-dose lacosamide -LSB- @-@ mg/day -RSB- on days @-@ ) and treatment B ( single doses of @ mg lacosamide on days @ and @ with @ days of @ mg/day omeprazole on days @-@ ) in pseudorandom order , separated by a @-day washout period .