STEP 6 Look at allergy drugs, cold medicines, pain medicines, and sleep aids that contain diphenhydramine.

注意含有苯海拉明成分的抗过敏药物，感冒药，止痛药和安眠药。

But in the brain, diphenhydramine blocks a different chemical that transmits signals.

但在大脑，苯海拉明阻断了另一种能传递信号的化学物质。

The high doses of diphenhydramine in a desperate attempt to finally fall asleep.

还有为了入睡不顾一切地服用的大剂量苯海拉明。