# 情境 28歲懷孕26週個案因社區肺炎自急診帶doxycycline 100 mg PO BID出院。優先護理為何?

> source: MyMerci (mymerci.kr)  
> url: https://mymerci.kr/pages/nclex_q.php?qn_id=375246&lang=zh-tw  
> language: zh-TW  
> subject: Adverse Effects/Contraindications/Interactions  
> category: PA

## 題目

情境 28歲懷孕26週個案因社區肺炎自急診帶doxycycline 100 mg PO BID出院。優先護理為何?

## 選項

1. 依照醫囑給予 doxycycline，並監測個案是否出現常見副作用，如光敏感和腸胃不適；記錄個案的擔憂，但應說明治療感染的益處大於胎兒風險，因為四環素類藥物屬於 D 級，並非絕對禁忌症。
2. 暫停doxycycline並聯絡處方者；四環素類因會與胎兒牙齒和骨骼結合造成黃褐色變色與可能骨骼生長延遲，且第3孕期有母體肝毒性風險，故懷孕期間一般禁用；依培養與敏感性建議改用懷孕相容替代藥(azithromycin或β-lactam如amoxicillin、cefuroxime、ceftriaxone)；提供諮詢並記錄過敏與產科病史。 **✔ 正確答案**
3. 將 doxycycline 劑量增加至 200 mg 每日兩次，因為懷孕期間血漿容積增加及腎小球過濾率提高會降低藥物濃度，因此需要較高劑量才能達到治療肺炎的有效濃度；每週監測肝功能以評估肝毒性，因為提高劑量可能會加劇孕婦風險。
4. 依照醫囑給予 doxycycline；未經治療的社區型肺炎可能導致膿胸或敗血症等併發症，對胎兒構成直接且嚴重的風險，而牙齒染色的風險屬外觀問題，並未超過孕婦的益處；護理師應給藥並安撫個案，說明此為標準治療。

**正確答案: 2**

## 解析

四環素類(包含doxycycline)在懷孕約18~20週後胎兒牙齒發育開始時一般禁用。影響：乳牙以及可能的恒牙永久性黃褐色變色、琺瑯質發育不全、可能可逆的骨骼生長延遲；亦與母體肝毒性相關，特別是第3孕期高劑量IV。標準護理：(1) 暫停劑量、聯絡處方者澄清並要求懷孕相容抗生素；(2) 依敏感性與嚴重度，懷孕CAP替代藥可用macrolide (azithromycin)或β-lactam (amoxicillin、cefuroxime、ceftriaxone)；若懷疑非典型病原以azithromycin優於doxycycline；(3) 與藥師會診以更新的FDA Pregnancy and Lactation Labeling Rule (PLLR)資料審視所有藥物對懷孕的安全性，而非舊有ABCDX類別；(4) 衛教個案並記錄。CDC允許在替代藥對母體有嚴重風險的情況下，對確診之危及生命的蜱媒疾病可短期使用doxycycline，但屬例外非常規。投予、加量、加ergot皆不安全。

## 深入解析

Doxycycline於懷孕禁用，改用懷孕相容藥。投予前先暫停澄清。蜱媒致命疾病為CDC允許的例外。

## 重要概念

- **pregnancy-contraindicated tetracycline** — 懷孕約18-20週後禁用，胎兒牙齒與骨骼，母體肝毒性，需暫停與替代
- **pregnancy CAP alternatives** — azithromycin、amoxicillin、cefuroxime、ceftriaxone，依敏感性
- **PLLR** — FDA懷孕與哺乳標示規則，取代舊ABCDX分類，提供描述性資料

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