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take a tranquilizer
take 常与药物搭配，表示“服药”。
She takes a tranquilizer before flying.
她坐飞机前会服用一颗镇静剂。
镇静剂；安定药
tranquilizers — plural of tranquilizer
先理解核心含义，再看它在真实句子里的用法。
镇静剂；安定药
a drug used to reduce stress or tension without reducing mental clarity
She takes a tranquilizer before flying.
她坐飞机前会服用一颗镇静剂。
使人镇静或安抚的事物；镇静剂。
That which tranquillizes or soothes.
用于减轻压力或紧张而不降低思维清晰度的药物
a drug used to reduce stress or tension without reducing mental clarity
镇静剂；用于减轻焦虑或紧张的药物
A drug used to reduce anxiety or tension.
After the doctor gave her a mild tranquilizer, she felt calm enough to sleep.
医生给她开了一种温和的镇静剂后，她平静下来，能够入睡了。
The dentist prescribed a tranquilizer to help patients relax before the procedure.
牙医开了镇静剂，帮助病人在手术前放松。
He keeps a tranquilizer in his bag for long flights because he gets anxious.
他在包里放了一颗镇静剂，因为长途飞行时会感到焦虑。
take 常与药物搭配，表示“服药”。
She takes a tranquilizer before flying.
她坐飞机前会服用一颗镇静剂。
prescribe 的主语通常是医生，后接药物及病/患者。
The doctor prescribed tranquilizers for her anxiety.
医生为她的焦虑症开了镇静剂。
be on + 药物 表示长期规律服用该药。
He has been on tranquilizers since the accident.
自从出事以来，他一直在服用镇静剂。
for 后接适应症，说明该药的用途。
This is a mild tranquilizer for tension headaches.
这是一种治疗紧张性头痛的温和镇静剂。
Not this
I need tranquilizer.
Use this
I need a tranquilizer.
tranquilizer 是可数名词，表示具体一粒/一片药时，单数前必须加不定冠词 a；中文没有冠词，所以容易漏掉。
Not this
The doctor prescribed two tranquilizer.
Use this
The doctor prescribed two tranquilizers.
tranquilizer 是可数名词，two 后必须用复数形式 tranquilizers；中文名词没有复数变化，所以容易忘记加 -s。
Not this
I ate a tranquilizer before bed.
Use this
I took a tranquilizer before bed.
表示“服药”英语用 take，不用 eat；这是受中文“吃药”直译成 eat 的影响。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
服用镇静剂
The doctor said I should take a tranquilizer before the flight.
医生说我在飞行前应该服用镇静剂。
开镇静剂
The psychiatrist prescribed a tranquilizer to help her sleep.
精神科医生给她开了镇静剂以帮助睡眠。
麻醉镖
The ranger used a tranquilizer dart to sedate the injured lion.
护林员用麻醉镖让受伤的狮子镇静下来。
温和的镇静剂
He asked for a mild tranquilizer because he disliked strong medication.
他要求开温和的镇静剂，因为他讨厌强效药。
镇静剂注射
The vet gave the dog a tranquilizer injection before the examination.
兽医在检查前给狗注射了镇静剂。
Use tranquilizers naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
tranquil（平静的）＋ -izer（表药剂）→ 让人平静的药丸，像给烦躁的心吃颗“定心丸”。
语域：neutral 常见场景：clinical settings、everyday speech、news reports tranquilizer 是表示“镇静剂”的常用中性词，多用于医疗说明、新闻报道和日常对话；在正式医学文献中同样适用。通常可译为“镇静剂”。
指镇静药物，不是比喻说法。
Dictionary facts from ECDICT, WIKTIONARY.