Complex sentence: Valproic acid and sodium valproate reduce the apparent clearance of lamotrigine (lamictal), in most patients the lamotrigine dosage for coadministration with valproate must be reduced to half the monotherapy dosage.
Split into simpler sentences: Valproic acid and sodium valproate reduce the apparent clearance of lamotrigine (lamictal). In most patients, the lamotrigine dosage for coadministration with valproate must be reduced to half the monotherapy dosage.