Pharmacology of Antitubercular Drugs
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Questions and Answers

A patient diagnosed with tuberculosis is prescribed isoniazid (INH). The nurse recognizes that pyridoxine (vitamin B6) is often co-prescribed with INH to prevent which side effect?

  • Hepatitis
  • Skin rash
  • Optic neuritis
  • Peripheral neuropathy (correct)

The nurse is educating a patient on rifampin therapy for tuberculosis. Which statement indicates the patient needs further teaching?

  • I need to take this medication exactly as prescribed to prevent resistance.
  • I should report any unusual symptoms to my healthcare provider.
  • I should expect red-orange discoloration of my urine and tears.
  • I can wear my contact lenses as usual while taking this medication. (correct)

A patient on ethambutol therapy reports difficulty distinguishing between red and green colors. What is the nurse's best action?

  • Reassure the patient that this is a normal side effect.
  • Advise the patient to increase dietary intake of vitamin B6.
  • Instruct the patient to stop the medication immediately.
  • Notify the healthcare provider for further evaluation. (correct)

A nurse is administering pyrazinamide to a patient with active tuberculosis. The nurse monitors for which primary adverse effect?

<p>Hepatotoxicity (C)</p> Signup and view all the answers

A patient is prescribed Rifater (a combination of rifampin, isoniazid, and pyrazinamide) for tuberculosis. What is the purpose of using a combination therapy?

<p>To prevent the development of drug resistance (D)</p> Signup and view all the answers

A patient receiving isoniazid (INH) reports tingling and numbness in their hands and feet. What is the nurse's priority intervention?

<p>Administer pyridoxine (vitamin B6) as prescribed. (A)</p> Signup and view all the answers

The nurse is teaching a patient about the adverse effects of ethambutol. Which statement by the patient demonstrates correct understanding?

<p>I should report any changes in my vision to my healthcare provider. (D)</p> Signup and view all the answers

A patient taking rifampin for tuberculosis asks why the medication must be taken as part of a combination regimen. What is the nurse's best response?

<p>Combination therapy helps prevent the development of drug resistance. (B)</p> Signup and view all the answers

During a follow-up visit, a patient on pyrazinamide therapy reports nausea and mild upper abdominal pain. What is the nurse's priority action?

<p>Assess liver function tests. (C)</p> Signup and view all the answers

A patient with tuberculosis asks why they must undergo visual acuity and color perception tests while taking ethambutol. What is the nurse's best response?

<p>Ethambutol can affect your optic nerve and cause vision problems. (B)</p> Signup and view all the answers

A nurse is caring for a patient receiving Rifater. Which combination of medications does Rifater include?

<p>Rifampin, pyrazinamide, isoniazid (D)</p> Signup and view all the answers

A patient is started on tuberculosis therapy with multiple medications. The nurse emphasizes the importance of adherence to therapy. What is the primary reason for this instruction?

<p>To avoid the development of multidrug-resistant tuberculosis (C)</p> Signup and view all the answers

Flashcards

Why is pyridoxine prescribed with isoniazid?

Isoniazid (INH) can cause nerve damage (peripheral neuropathy) due to vitamin B6 deficiency. Vitamin B6 (pyridoxine) supplements help prevent this side effect.

Why should a patient on rifampin therapy use glasses?

Rifampin can cause red-orange discoloration in urine, tears, and even permanently stain contact lenses. Thus, patients should use glasses instead.

What should the nurse do if a patient on ethambutol reports vision problems?

Ethambutol can cause optic neuritis, leading to difficulty distinguishing colors or reduced vision. A healthcare provider needs to evaluate the patient's vision and possibly adjust the medication.

What is the primary side effect of pyrazinamide?

Pyrazinamide is known to cause dose-dependent liver damage (hepatotoxicity). Regular monitoring of liver function tests is essential.

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Why are combination therapies like Rifater used for tuberculosis?

Combining multiple medications for tuberculosis treatment helps prevent the development of drug resistance, a major concern in TB management. Other benefits include better compliance and shorter treatment duration.

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What is the priority intervention for a patient on isoniazid who reports tingling and numbness?

Peripheral neuropathy (tingling, numbness in hands and feet) caused by isoniazid is related to vitamin B6 deficiency. Administering vitamin B6 (pyridoxine) as prescribed can relieve these symptoms.

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What should a patient taking ethambutol be instructed about regarding their vision?

Ethambutol can cause optic neuritis, leading to changes in vision like decreased acuity and color discrimination. Patients need to report any vision changes to their healthcare provider immediately.

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Why is combination therapy important in tuberculosis treatment?

Combination therapy for TB, like using multiple drugs, prevents the emergence of drug-resistant strains. Although it may also improve compliance and reduce treatment time, the primary reason is to prevent resistance.

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What is the nurse's priority action if a patient on pyrazinamide reports abdominal pain and nausea?

Nausea and upper abdominal pain could indicate hepatotoxicity, a potential adverse effect of pyrazinamide. Assessing liver function tests is critical to identify potential liver damage early.

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Why are visual acuity and color perception tests important for patients taking ethambutol?

Ethambutol can cause optic neuritis, which affects the optic nerve and results in vision problems like decreased acuity and color blindness. Regular vision tests help detect these problems early.

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What medications are included in Rifater?

Rifater is a combination medication containing rifampin, pyrazinamide, and isoniazid. It is used in the initial phase of TB treatment to maximize effectiveness and reduce resistance.

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Why is patient adherence crucial for tuberculosis therapy?

Adhering to prescribed tuberculosis treatment is essential to prevent the development of multidrug-resistant strains. These resistant strains are much harder and more expensive to treat.

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What medication is used to prevent peripheral neuropathy caused by isoniazid?

Isoniazid, a common tuberculosis medication, can cause peripheral neuropathy. Administering vitamin B6 (pyridoxine) as prescribed can help prevent this side effect.

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What side effect of rifampin can affect contact lenses?

Rifampin can cause red-orange discoloration in bodily fluids, including urine and tears. It can also permanently stain contact lenses, so it is important to wear glasses instead of contacts.

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What visual side effect is associated with ethambutol?

Ethambutol, a tuberculosis drug, can cause optic neuritis, leading to color vision changes and decreased visual acuity. Patients must promptly report any vision changes to their healthcare provider.

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What is a key side effect of pyrazinamide that requires monitoring?

Pyrazinamide, a medication for tuberculosis, can cause liver damage (hepatotoxicity). Regular monitoring of liver function tests is crucial to identify potential problems early.

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What is the main reason for using combination therapy for tuberculosis?

Combination therapy for tuberculosis utilizes multiple medications to prevent drug resistance. While it can also improve compliance and shorten treatment duration, preventing drug resistance is the primary reason for its use.

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What is the mechanism behind peripheral neuropathy caused by isoniazid?

Isoniazid, a common tuberculosis medication, can cause a deficiency in vitamin B6, which can lead to peripheral neuropathy (tingling and numbness in the extremities).

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How can rifampin affect contact lens use?

Rifampin, a drug used for tuberculosis, can cause red-orange discoloration of bodily fluids, which may permanently stain contact lenses.

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What is the mechanism of action behind visual problems associated with ethambutol?

Ethambutol can lead to optic neuritis, a condition that affects the optic nerve, causing difficulty distinguishing colors and reduced visual acuity.

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What organ is primarily affected by the adverse effects of pyrazinamide?

Pyrazinamide, one of the medications for tuberculosis, can cause damage to the liver, known as hepatotoxicity. Regular monitoring of liver function tests is essential during treatment.

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How does combination therapy for tuberculosis work?

Combination therapy for tuberculosis involves using multiple medications concurrently to effectively inhibit the growth of Mycobacterium tuberculosis and prevent the development of drug resistance.

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Why does isoniazid cause peripheral neuropathy?

Isoniazid, a commonly used tuberculosis medication, causes a deficiency in vitamin B6, which is crucial for nerve function, leading to the development of peripheral neuropathy, characterized by tingling and numbness in the extremities.

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How can rifampin impact contact lens use?

Rifampin, a medication used for tuberculosis, can cause red-orange discoloration of bodily fluids, which can stain contact lenses permanently, impacting the patient's vision.

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What is the link between ethambutol and vision changes?

Ethambutol, a tuberculosis drug, can cause optic neuritis, which affects the optic nerve, leading to color vision changes and a decrease in visual acuity.

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What is the primary adverse effect of pyrazinamide?

Pyrazinamide, a medication for tuberculosis, can cause damage to the liver (hepatotoxicity), which needs to be monitored through regular liver function tests.

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What is the benefit of using combination therapy for tuberculosis?

Combination therapy for tuberculosis uses multiple medications simultaneously to combat the growth of the Mycobacterium tuberculosis bacteria, preventing drug resistance. The synergistic action of the different drugs increases treatment effectiveness.

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Study Notes

Question 1

  • Pyridoxine (vitamin B6) is often co-prescribed with isoniazid (INH) to prevent peripheral neuropathy.
  • Hepatitis, optic neuritis, and skin rashes are not prevented by vitamin B6.

Question 2

  • Rifampin therapy for tuberculosis can cause red-orange discoloration of urine and tears.
  • Patients should not use contact lenses while taking rifampin.
  • Patients should take the medication exactly as prescribed, to prevent resistance.
  • Patients should report any unusual symptoms to their healthcare provider.

Question 3

  • Patients on ethambutol therapy may experience difficulty distinguishing between red and green colors.
  • Notify the healthcare provider for further evaluation.
  • Ethambutol can cause optic neuritis, which may present as difficulty distinguishing colors or decreased visual acuity.

Question 4

  • Hepatotoxicity is a primary adverse effect of pyrazinamide, which is monitored by liver function tests.
  • Red-orange discoloration of body fluids is an adverse effect of rifampin.
  • Peripheral neuropathy is an adverse effect of isoniazid.
  • Optic neuritis is an adverse effect of ethambutol.

Question 5

  • Rifater (combination therapy) is used to prevent drug resistance in tuberculosis.
  • Combination therapies for tuberculosis can minimize therapy duration, improve patient compliance, and reduce side effects.

Question 6

  • Tingling and numbness in hands and feet are symptoms of peripheral neuropathy.
  • Administer pyridoxine (vitamin B6) as prescribed.

Question 7

  • Patients should report any changes in vision to their healthcare provider when taking ethambutol.
  • Ethambutol can cause optic neuritis.
  • Red-orange discoloration is a side effect of rifampin.
  • Tingling is a possible side effect of isoniazid.

Question 8

  • Combination therapy helps prevent the development of drug resistance in tuberculosis.
  • Rifampin can be effective on its own, but resistance develops quickly when not used with other drugs.

Question 9

  • Assess liver function tests as a priority if a patient taking pyrazinamide reports nausea or mild upper abdominal pain.
  • Monitoring liver function tests identifies potential liver damage (hepatotoxicity).

Question 10

  • Conduct visual acuity and color perception tests before and during treatment to detect potential problems.
  • Ethambutol can cause optic neuritis, which may result in vision changes, including decreased acuity and color blindness.

Question 11

  • Rifater contains rifampin, pyrazinamide, and isoniazid.

Question 12

  • Adherence is important to avoid the development of multidrug-resistant tuberculosis.
  • Multiple medications are used to ensure more effective treatment.

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Description

This quiz covers important information regarding the pharmacological properties and side effects of antitubercular medications such as isoniazid, rifampin, ethambutol, and pyrazinamide. It emphasizes critical monitoring and patient education to mitigate risks associated with these drugs. Test your knowledge on these vital aspects of tuberculosis therapy.

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