However, many drugs, for example, anticonvulsants such as phenytoin, phenobarbital, and carbamazepine, stimulate cytochrome P450 3A4, induce hepatic enzymes, and lead to accelerated glucocorticoid metabolism and reduced glucocorticoid effect, possibly causing acute adrenal insufficiency [16]. The gene discussed is CYP3A4; the disease is Adrenal insufficiency.