A nurse is caring for a 45-year-old client with chronic hepatitis B who is receiving antiviral therapy with tenofovir. Which nursing intervention is the priority for this client?

Tenofovir therapy requires priority monitoring for renal and bone adverse effects due to its nephrotoxicity and bone demineralization risks. Other options are important but not specific priorities for this medication.

Core Nursing Explanation Key Concept Analysis: This question assesses your ability to prioritize nursing interventions based on the specific, high-risk adverse effects of a medication. The client has chronic Hepatitis B virus (HBV) infection and is being treated with tenofovir, a nucleoside reverse transcriptase inhibitor (NRTI). While managing the underlying liver disease is crucial, the question asks for the priority intervention related to the pharmacotherapy. The core principle is medication-specific toxicity monitoring. Tenofovir is well-known for its potential to cause nephrotoxicity (kidney damage) and affect bone mineral density.

Answer Rationale: Key Point! The correct answer is to Monitor for renal and bone-related adverse effects. Tenofovir is excreted renally and can cause proximal renal tubulopathy, leading to Fanconi syndrome (wasting of phosphate, glucose, amino acids, bicarbonate) and a decline in the glomerular filtration rate (GFR). It can also cause osteomalacia (bone softening) and reduce bone mineral density. These are serious, potentially irreversible adverse effects that require proactive monitoring (e.g., baseline and periodic serum creatinine, estimated GFR, urine glucose/protein, serum phosphate, and possibly bone density scans). This monitoring is the priority because it aims to prevent or detect organ damage early.

Distractor Analysis:
Watch out for confusion! Option ②, "Assess for signs of hepatic encephalopathy daily," is a critical nursing action for a patient with advanced liver disease or cirrhosis, but it is not the priority intervention specific to tenofovir therapy. Hepatic encephalopathy is managed by reducing ammonia levels, not directly by this antiviral.
Option ③, "Administer the medication with high-fat meals," is incorrect. Tenofovir disoproxil fumarate (the common formulation) is best administered on an empty stomach to maximize absorption, though tenofovir alafenamide (a newer prodrug) can be taken with food. The instruction is not a universal priority for the drug class.
Option ④, "Encourage increased fluid intake to prevent dehydration," is a general supportive measure. While adequate hydration is good for renal health, it is not the priority or most specific intervention for tenofovir's known toxicities. The focus should be on direct monitoring of renal function.

Related Concepts: This integrates pharmacology (drug mechanism and adverse effects), medical-surgical nursing (care of the patient with chronic viral hepatitis), and the nursing process (prioritizing assessment and monitoring). Remember: For any medication, know the "big three": 1) Why is it given (indication)? 2) What are the major side effects? 3) What is the essential nursing monitoring/teaching?

Concept Summary

Concept	Key Points
Tenofovir (NRTI)	Antiviral for HBV/HIV. Major toxicities: Nephrotoxicity and Bone demineralization.
Priority Nursing Intervention	Monitoring renal function (creatinine, eGFR, urinalysis) and bone health (symptoms of bone pain, fractures).
Chronic Hepatitis B Nursing	Focus on preventing progression: medication adherence, avoiding hepatotoxins (alcohol), vaccination of contacts, monitoring for complications (cirrhosis, hepatocellular carcinoma).

Side-by-Side Comparison!

Antiviral for Hepatitis B	Key Nursing Monitoring Priorities	Mechanism / Notes
Tenofovir	Renal function & Bone density	NRTI. Risk of nephrotoxicity and osteomalacia.
Entecavir	Lactic acidosis (rare), HBV flare if stopped abruptly.	Nucleoside analogue. Generally well-tolerated.
Interferon-alpha	Flu-like symptoms, depression, bone marrow suppression (neutropenia, thrombocytopenia).	Immunomodulator. Given by injection. Monitor CBC, mental status.

Anatomy, Physiology & Pharmacology Points

• Renal Connection: Tenofovir is filtered and secreted by the kidneys. It can accumulate and cause damage to the proximal convoluted tubules, impairing reabsorption.
• Bone Connection: Renal tubule damage leads to phosphate wasting, causing hypophosphatemia. Phosphate is essential for bone mineralization; deficiency leads to soft, weak bones (osteomalacia).
• Lab Values to Know: Monitor Serum Creatinine (0.6-1.2 mg/dL), eGFR (>60 mL/min/1.73m²), Serum Phosphate (2.5-4.5 mg/dL). Rising creatinine or falling eGFR/phosphate signals toxicity.

Memory Tips

• Acronym: Think "Tenofovir = Toxic to Tubules and Thinning bones."
• Association: The drug name sounds like "ten-of-our" bones and kidneys are at risk.

High-Frequency NCLEX Topics The NCLEX-RN loves to test priority-setting for medication side effects. You must distinguish between general patient care and specific, high-risk, drug-related interventions. Questions often pair a chronic condition (like hepatitis) with a drug that has distinct toxicities to a different organ system (like the kidneys).

Watch Out for Question Variations!

• Shift from "Monitor" to "Teach": "Which statement by the client indicates understanding of tenofovir therapy?" Correct answer would relate to reporting bone pain or understanding the need for regular blood tests for kidney function.
• Shift to "Lab Value Interpretation": Present lab results showing elevated creatinine and low phosphate, then ask for the appropriate nursing action (likely holding the drug and notifying the provider).
• Shift to "Priority Assessment Finding": "The nurse notes the client has new-onset bone pain in the hips. Which action should the nurse take first?" This links the symptom directly to the drug's adverse effect.

Nursing Clinical Practice Guide Clinical Scenario: Mr. Chen, 45, is in the clinic for a follow-up visit 3 months after starting tenofovir for chronic Hepatitis B. He reports feeling generally well but mentions some new, vague lower back pain he attributes to "getting older."

Nursing Intervention Strategy:

1. Assessment: Perform a focused assessment. Ask about the character, location, and timing of the back pain. Inquire about changes in urine output, color, or foaminess (proteinuria). Review his medication list for other nephrotoxic drugs (e.g., NSAIDs). Check his latest lab work: creatinine, eGFR, phosphate, and urinalysis.
2. Nursing Diagnosis: Risk for Injury related to potential adverse effects of pharmacological therapy (renal impairment, altered bone integrity).
3. Planning & Implementation: The priority is to report the symptom of bone pain and any abnormal lab values to the healthcare provider immediately. Educate the patient on the importance of reporting any new bone pain, muscle weakness, or changes in urine. Reinforce adherence to scheduled lab monitoring. Collaborate with the provider; the plan may include a bone density scan (DEXA) or a dose adjustment/medication change.
4. Evaluation: Evaluate the patient's understanding of medication monitoring. Follow up to ensure lab tests are completed and results are addressed. Monitor for resolution or progression of symptoms after any intervention.

Patient Safety and Precautions:

• Contraindications/Cautions: Use tenofovir with extreme caution in patients with pre-existing renal impairment. Dose adjustments are required based on eGFR.
• Drug Interactions: Concurrent use with other nephrotoxic drugs (aminoglycosides, NSAIDs, IV contrast dye) increases risk. Monitor closely.
• Key Monitoring Points: Baseline assessment of renal function and bone density is essential before starting therapy. Schedule regular monitoring (e.g., every 3-6 months initially).

Nursing Procedure & Medication Flow For a Nurse Administering/Monitoring Tenofovir:

1. Pre-Administration: Verify the most recent serum creatinine and eGFR. If significantly elevated from baseline, hold the dose and notify the provider.
2. Administration: Administer tenofovir disoproxil fumarate on an empty stomach (1 hour before or 2 hours after a meal) unless specifically instructed otherwise (e.g., tenofovir alafenamide).
3. Post-Administration/Teaching: Teach the patient to take the medication consistently, at the same time each day. Emphasize: "This medication controls the Hepatitis B virus but can affect your kidneys and bones. You must have your blood and urine checked regularly as directed. Report any new bone pain, muscle aches, or changes in your urine to us immediately."

A Word from Your Senior Nurse "In the real world, patients on long-term medications like tenofovir often forget why they need 'those extra blood tests.' As their nurse, you are the bridge. You connect the dots between the pill they take and the lab slip they're given. Your vigilant monitoring and clear education can prevent a manageable side effect from turning into permanent kidney damage or a debilitating fracture. On the NCLEX and in practice, always ask yourself: 'What is the worst thing that could happen with this drug?' Your priority is to watch for that."