Aminoglycoside Antibiotics Pharmacology
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Questions and Answers

What is a major concern when treating mycobacterial infections due to their slow growth?

  • High patient adherence
  • Decreased risk for drug resistance
  • Increased risk for drug toxicity (correct)
  • Short treatment duration

How does the slow growth of mycobacteria contribute to drug resistance?

  • Prevents drug resistance from developing
  • Promotes emergence of drug resistant strains (correct)
  • Decreases the duration of treatment
  • Reduces the need for combination therapy

What is the primary method of transmission for tuberculosis?

  • Ingestion of contaminated food
  • Direct skin contact
  • Inhalation of infected sputum (correct)
  • Sexual transmission

How do normal individuals with normal immune systems usually respond to tuberculosis infection?

<p>90% never develop clinical signs or radiologic evidence of tuberculosis (A)</p> Signup and view all the answers

What happens to individuals with latent tuberculosis infection without treatment?

<p>There is always a risk that latent infection may become active (A)</p> Signup and view all the answers

What percentage of individuals with latent tuberculosis may experience reactivation and renewed multiplication of tubercle bacilli?

<p>5-10% (D)</p> Signup and view all the answers

What is the primary goal of treating tuberculosis according to the text?

<p>To eliminate drug-resistant organisms (A)</p> Signup and view all the answers

What defines extensively drug-resistant TB (XDR-TB) according to the text?

<p>Resistant to isoniazid, rifampin, fluoroquinolones, and a second-line anti-TB drug (C)</p> Signup and view all the answers

What factor greatly increases the risk for death among patients with AIDS who have TB?

<p>Infection with multi-drug–resistant organisms (D)</p> Signup and view all the answers

Why is it essential to determine drug sensitivity in isolates from each patient at treatment onset?

<p>To determine if the patient has drug-resistant TB (C)</p> Signup and view all the answers

What is the purpose of initial empiric drug selection for TB treatment?

<p>To minimize the risk for drug resistance (B)</p> Signup and view all the answers

What is a consequence of TB treatment failure according to the text?

<p>Need for repeated sensitivity tests (B)</p> Signup and view all the answers

Why must antituberculosis regimens always contain two or more drugs?

<p>To kill all actively multiplying bacilli present (A)</p> Signup and view all the answers

What is a characteristic of MDR-TB according to the text?

<p>Resistance to both isoniazid and rifampin (C)</p> Signup and view all the answers

What defines Cycloserine, Ethionamide, and Capreomycin in relation to TB treatment?

<p>Second-line drugs for multi-drug–resistant TB (C)</p> Signup and view all the answers

How does using multiple anti-TB agents reduce the risk for drug resistance?

<p>Decreases likelihood of bacillus developing resistance to two drugs (C)</p> Signup and view all the answers

What is the primary mode of bacteriologic evaluation of sputum?

<p>Monthly evaluations until 2 consecutive negative tests (D)</p> Signup and view all the answers

What should be evaluated at every clinical visit according to the text?

<p>Fever, malaise, anorexia, cough (A)</p> Signup and view all the answers

How should patients be treated if drug resistance is not demonstrated?

<p>Add two effective drugs to the current regimen (B)</p> Signup and view all the answers

What is the recommended duration for Isoniazid treatment as a single agent for latent TB?

<p>9 months (C)</p> Signup and view all the answers

Which drug is bactericidal to M. tuberculosis at both extracellular and intracellular sites?

<p>Rifampin (A)</p> Signup and view all the answers

What is a common adverse effect of Isoniazid that can be reduced by taking pyridoxine (Vitamin B6)?

<p>Peripheral neuropathies (D)</p> Signup and view all the answers

Which enzyme systems does Isoniazid inhibit?

<p>CYP2C9, CYP2C19, CYP2E1 (C)</p> Signup and view all the answers

'Rifampin decreases the effectiveness of oral contraceptives' - this statement is due to which mechanism?

<p>Increasing drug metabolism (B)</p> Signup and view all the answers

Which phase of tuberculosis treatment aims to eliminate actively dividing extracellular tubercle bacilli?

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

What is the duration of the continuation phase in tuberculosis treatment?

<p>18 weeks (A)</p> Signup and view all the answers

How long is the treatment duration for Rifampin-resistant TB?

<p>24 months (A)</p> Signup and view all the answers

What common problem arises when patients with TB take rifampin alongside certain HIV medications?

<p>Accelerated HIV drug metabolism (C)</p> Signup and view all the answers

What is the significance of rifabutin in relation to rifampin for dual infection treatment?

<p>Rifabutin has a lesser impact on HIV medication metabolism. (A)</p> Signup and view all the answers

Why is patient nonadherence highlighted as a significant issue in tuberculosis treatment?

<p>To ensure treatment success (B)</p> Signup and view all the answers

What is the purpose of Directly Observed Therapy (DOT) in tuberculosis treatment?

<p>To confirm patient adherence (B)</p> Signup and view all the answers

What role does Directly Observed Therapy (DOT) play in tuberculosis treatment?

<p>It helps evaluate the clinical response and adverse effects. (D)</p> Signup and view all the answers

What makes MDR-TB and XDR-TB more difficult to manage than drug-sensitive TB?

<p>Need for second- and third-line drugs (C)</p> Signup and view all the answers

Why is it challenging to combine rifampin with certain antiretroviral drugs for dual infection treatment?

<p>It accelerates the metabolism of antiretroviral drugs. (B)</p> Signup and view all the answers

What is the principal concern associated with the use of rifampin?

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

Which drug is known for causing a red-orange color in urine, sweat, saliva, and tears?

<p>Rifabutin (A)</p> Signup and view all the answers

What is the most common side effect of rifabutin among patients?

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

Why is rifabutin preferred over rifampin in HIV patients?

<p>It has less impact on the metabolism of protease inhibitors and NNRTIs (A)</p> Signup and view all the answers

Which drug is specifically mentioned as being used for TB resistant to primary agents?

<p>Capreomycin (A)</p> Signup and view all the answers

Among first-line drugs, which one is known to be the most hepatotoxic?

<p>Pyrazinamide (D)</p> Signup and view all the answers

Which drug can cause damage to the eighth cranial nerve leading to hearing loss?

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

What is the main reason liver function tests are recommended before and during rifabutin treatment?

<p>To detect hepatotoxicity (B)</p> Signup and view all the answers

Why are women using oral contraceptives advised to use another birth control method when taking rifabutin?

<p>Rifabutin interacts with oral contraceptives leading to reduced effectiveness (C)</p> Signup and view all the answers

What is the main reason capreomycin should not be used in patients with kidney disease?

<p>Principal toxicity is renal damage (D)</p> Signup and view all the answers

Which adverse effect is common to both para-aminosalicylic acid (PAS) and ethionamide?

<p>Peripheral neuropathy (B)</p> Signup and view all the answers

What is the mechanism of action of cycloserine?

<p>Inhibiting cell wall synthesis (D)</p> Signup and view all the answers

Why is para-aminosalicylic acid (PAS) considered different from sulfonamides?

<p>It is only active against mycobacteria (D)</p> Signup and view all the answers

What sets bedaquiline apart from other anti-TB drugs?

<p>Works faster and better than other anti-TB drugs (A)</p> Signup and view all the answers

Which of the following statements is true about amikacin, kanamycin, and streptomycin?

<p>May damage the eighth cranial nerve (A)</p> Signup and view all the answers

What should be monitored periodically in patients taking ethionamide?

<p>Serum transaminases (AST, ALT) (B)</p> Signup and view all the answers

Why is amikacin, kanamycin, and streptomycin administered parenterally?

<p>They are not absorbed from the GI tract (D)</p> Signup and view all the answers

What is a distinguishing feature of para-aminosalicylic acid (PAS) compared to ethionamide?

<p>Broad-spectrum antibiotic activity (A)</p> Signup and view all the answers

What should patients taking cycloserine be monitored for?

<p>Serum concentrations of cycloserine (C)</p> Signup and view all the answers

What distinguishes ethionamide from other anti-TB drugs?

<p>Less active against mycobacteria than isoniazid (D)</p> Signup and view all the answers

Which drug is effective against ascariasis?

<p>Pyrantel pamoate (A)</p> Signup and view all the answers

What is the drug of choice for trichinosis?

<p>Albendazole (D)</p> Signup and view all the answers

Which drug is used to treat wuchereriasis and brugiasis?

<p>Diethylcarbamazine (A)</p> Signup and view all the answers

What is the main response to threadworm (strongyloidiasis)?

<p>Ivermectin (A)</p> Signup and view all the answers

Which drug is indicated for fish tapeworm infestation?

<p>Praziquantel (A)</p> Signup and view all the answers

What is the treatment for liver fluke infestation?

<p>Praziquantel (D)</p> Signup and view all the answers

Which drug should be used against pinworms?

<p>Pyrantel pamoate (D)</p> Signup and view all the answers

What is the drug of choice for tapeworm infestations?

<p>Albendazole (B)</p> Signup and view all the answers

What is the main response of whipworm (trichuriasis) to drug treatment?

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

What drug is effective against onchocerciasis, also known as river blindness worm?

<p>Ivermectin (B)</p> Signup and view all the answers

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