First, with the help of enzyme tyrosine hydroxylase (TH), tyrosine gets converted to L-dopa, also known as levodopa.

首先，在酪氨酸羟酶（TH）的帮助下，酪氨酸也旋多巴被称旋多巴。

Medications like phenytoin, an anticonvulsant, uses liver and kidney hydroxylase enzymes for its own metabolism, so especially with long term use, there's not enough vitamin D being generated.

苯妥英，抗惊厥药物，会占用肝肾的羟酶用于药物代谢，所以对于尤其是长期用该药的患者，其维生素D生成可能不足。