# A 52-year-old patient newly diagnosed with primary hypothyroidism is prescribed levothyroxine 75 mcg daily. Which instruction should the nurse include?

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> url: https://mymerci.kr/pages/nclex_q.php?qn_id=372745&lang=en  
> language: en  
> subject: Adverse Effects/Contraindications/Interactions  
> category: PPT

## Question

A 52-year-old patient newly diagnosed with primary hypothyroidism is prescribed levothyroxine 75 mcg daily. Which instruction should the nurse include?

## Option

1. "Take this medication with breakfast to reduce stomach upset."
2. "Take this medication only when symptoms (fatigue, cold intolerance) return."
3. "Stop the medication once your TSH normalizes; the gland will recover."
4. "Take this medication on an empty stomach, 30 to 60 minutes before breakfast, with water, and separate it by at least 4 hours from calcium, iron, or antacid supplements." **✔ Correct answer**

**Correct answer: 4**

## Explanation

Levothyroxine is a thyroid hormone replacement that requires consistent absorption to maintain steady serum levels. Correct teaching: take in the morning on an empty stomach, 30–60 minutes before breakfast, with water; separate from calcium, iron, magnesium, and antacids by at least 4 hours because these chelate levothyroxine and reduce absorption. Soy, high-fiber meals, and coffee can also interfere if too close. Levothyroxine is a LIFELONG replacement for primary hypothyroidism — choices 2 and 3 are wrong; symptoms recur and TSH rises if discontinued. Choice 1 is wrong because food impairs absorption — fasting state is required. Monitor TSH every 6–8 weeks during titration, then every 6–12 months on stable dose.

## In-depth explanation

Levothyroxine absorption rules: take on an empty stomach 30 to 60 minutes before breakfast with water, separate from calcium, iron, magnesium, and antacids by at least 4 hours, and recognize that soy, high-fiber meals, and coffee can also reduce absorption when taken too close. Consistent timing and consistent food relationship matter as much as the prescribed dose. TSH monitoring: initial TSH check 6 to 8 weeks after starting or after a dose change, and every 6 to 12 months once stable. Goal TSH is 0.5 to 2.5 mIU/L for most adults, with older adults potentially targeting up to 4 to 6. Symptoms of overdose (hyperthyroidism) include tachycardia, palpitations, weight loss, tremor, and heat intolerance. Lifelong therapy: primary hypothyroidism following Hashimoto thyroiditis, thyroidectomy, or RAI requires lifelong replacement; stopping causes the return of fatigue, cold intolerance, weight gain, bradycardia, and depression. Patients should never alter or skip doses without provider guidance.

## Clinical scenario

A **52-year-old patient** newly diagnosed with **primary hypothyroidism** is prescribed **levothyroxine 75 mcg daily**. The nurse provides discharge teaching.

## Key concepts

- **Levothyroxine Absorption Rules** — Take on an empty stomach, 30–60 minutes before breakfast, with water. Separate from calcium, iron, magnesium, and antacids by at least 4 hours. Soy, high-fiber meals, and coffee can also reduce absorption if taken too close. Consistent timing and consistent food relationship matter as much as the dose.
- **TSH Monitoring** — Initial TSH check 6–8 weeks after starting or after a dose change; once stable, every 6–12 months. Goal TSH 0.5–2.5 mIU/L for most adults; older adults may target up to 4–6. Symptoms of overdose (hyperthyroidism): tachycardia, palpitations, weight loss, tremor, heat intolerance.
- **Lifelong Therapy** — Primary hypothyroidism (post-Hashimoto, post-thyroidectomy, post-RAI) requires lifelong replacement. Stopping causes return of hypothyroid symptoms — fatigue, cold intolerance, weight gain, bradycardia, depression. Patients should never alter or skip doses without provider guidance.

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