Valproate, carbamazepine, phenytoin, primidone, phenobarbitone, rifampicin, lopinavir/ritonavir, atazanavir/ritonavir, ethinylestradiol/levonorgestrel, lithium, bupropion, olanzapine, oxcarbazepine, felbamate, gabapentin, levetiracetam, pregabalin, topiramate, zonisamide, aripiprazole, lacosamide, perampanel. May cause false positive readings, particularly for phencyclidine (PCP).