Second-Line Medications for Tuberculosis

NCLEX Review Guide: Second-Line Medications for Tuberculosis

Second-Line Anti-TB Medications Overview

Injectable Agents

Streptomycin: Aminoglycoside antibiotic administered intramuscularly, requiring monitoring of eighth cranial nerve function and renal status due to ototoxicity and nephrotoxicity risks.
Amikacin and Kanamycin: Alternative aminoglycosides used when streptomycin resistance occurs, with similar monitoring requirements for hearing loss and kidney function.
Capreomycin: Polypeptide antibiotic with high nephrotoxicity and ototoxicity potential, reserved for multidrug-resistant TB cases.

Clinical Alert: All injectable second-line agents require baseline and periodic audiometry testing due to irreversible hearing loss risk.

Key Points

Injectable agents are typically used for 2-6 months in treatment regimens
Monitor creatinine, BUN, and electrolytes weekly during therapy
Avoid concurrent use with other ototoxic or nephrotoxic medications

Oral Second-Line Agents

Fluoroquinolones (Levofloxacin, Moxifloxacin): Highly effective oral agents with good CNS penetration, commonly used in MDR-TB regimens with monitoring for QT prolongation and tendon rupture.
Ethionamide/Prothionamide: Oral bacteriostatic agents causing significant GI upset, hepatotoxicity, and hypothyroidism requiring thyroid function monitoring.
Cycloserine: CNS-active agent causing psychiatric symptoms including depression, psychosis, and seizures, requiring mental health assessment before initiation.
Para-aminosalicylic acid (PAS): GI-irritating agent with malabsorption potential, requiring large pill burden and frequent dosing.

Memory Aid: "FLECS"

Fluoroquinolones - QT issues
Linezolid - Bone marrow suppression
Ethionamide - GI upset
Cycloserine - CNS/psychiatric
Streptomycin - 8th nerve damage

Monitoring and Adverse Effects

Critical Monitoring Parameters

Medication	Primary Toxicity	Monitoring Required
Streptomycin	Ototoxicity/Nephrotoxicity	Audiometry, Creatinine
Fluoroquinolones	QT Prolongation	ECG, Electrolytes
Ethionamide	Hepatotoxicity	LFTs, TSH
Cycloserine	CNS Toxicity	Mental status, Seizure risk

Obtain baseline laboratory values including CBC, comprehensive metabolic panel, and liver function tests
Perform baseline audiometry and ECG for patients receiving injectable agents or fluoroquinolones
Assess mental health status and seizure history before cycloserine initiation
Monitor weekly during initial therapy, then monthly once stable
Educate patients on early signs of toxicity and when to contact healthcare provider

Clinical Scenario

A 45-year-old patient with MDR-TB is prescribed levofloxacin, ethionamide, and cycloserine. Priority nursing assessments include ECG monitoring for QT prolongation, liver function tests for hepatotoxicity, and mental status evaluation for psychiatric symptoms. The nurse should educate about taking ethionamide with food to minimize GI upset.

Commonly Confused Concepts

First-Line vs Second-Line Distinctions

Aspect	First-Line (RIPE)	Second-Line
Efficacy	Higher bactericidal activity	Lower efficacy, more resistance
Toxicity	Generally better tolerated	Higher toxicity profile
Duration	6-9 months typically	18-24 months minimum
Cost	Less expensive	Significantly more costly

Key Points

Second-line agents are reserved for drug-resistant TB or first-line intolerance
Treatment duration is significantly longer with second-line regimens
Close monitoring is essential due to increased adverse effect profile

Study Tips and Quick Checks

NCLEX Success Strategies

Priority Nursing Actions

Always assess for drug resistance patterns before second-line therapy
Monitor for specific toxicities based on medication class
Ensure directly observed therapy (DOT) compliance
Educate about prolonged treatment duration and importance of adherence

Common Pitfalls

Forgetting that second-line therapy requires 18-24 months minimum duration
Not recognizing early signs of ototoxicity with aminoglycosides
Missing psychiatric screening before cycloserine administration
Inadequate monitoring of QT interval with fluoroquinolones

Quick Check Questions

☐ Can you identify the main toxicity of each second-line agent?
☐ Do you know the monitoring requirements for injectable agents?
☐ Can you explain why second-line therapy takes longer?
☐ Do you understand DOT importance in MDR-TB?

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Second-Line Medications for Tuberculosis

NCLEX Review Guide: Second-Line Medications for Tuberculosis

Second-Line Anti-TB Medications Overview

Injectable Agents

Key Points

Oral Second-Line Agents

Memory Aid: "FLECS"

Monitoring and Adverse Effects

Critical Monitoring Parameters

Clinical Scenario

Commonly Confused Concepts

First-Line vs Second-Line Distinctions

Key Points

Study Tips and Quick Checks

NCLEX Success Strategies

Priority Nursing Actions

Common Pitfalls

Quick Check Questions

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제안하기

컨텐츠 수정하기

Second-Line Medications for Tuberculosis

NCLEX Review Guide: Second-Line Medications for Tuberculosis

Second-Line Anti-TB Medications Overview

Injectable Agents

Key Points

Oral Second-Line Agents

Memory Aid: "FLECS"

Monitoring and Adverse Effects

Critical Monitoring Parameters

Clinical Scenario

Commonly Confused Concepts

First-Line vs Second-Line Distinctions

Key Points

Study Tips and Quick Checks

NCLEX Success Strategies

Priority Nursing Actions

Common Pitfalls

Quick Check Questions