Fluoroquinolones Antibiotics Overview
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Questions and Answers

What is the key difference between the older and newer groups of fluoroquinolones?

  • Different mechanism of action
  • Different spectrum of activity (correct)
  • Different year of introduction
  • Different chemical structure

Why are trovafloxacin and gatifloxacin no longer on the market?

  • Due to allergic reactions
  • Due to liver toxicity and hypoglycemia/hyperglycemia, respectively (correct)
  • Due to resistance development
  • Due to high cost

Why are the newer fluoroquinolones referred to as respiratory fluoroquinolones?

  • Due to limited treatment indications
  • Due to their activity against S.pneumoniae (correct)
  • Due to lack of adverse effects
  • Due to specific drug distribution

What is the primary way in which fluoroquinolones exert their bactericidal effects?

<p>Interference with enzymes required for bacterial DNA synthesis and repair (B)</p> Signup and view all the answers

Why is sparfloxacin no longer available in the United States?

<p>Due to withdrawal from the market (C)</p> Signup and view all the answers

What distinguishes fluoroquinolones from the older quinolone nalidixic acid in terms of antimicrobial efficacy?

<p>$2$ chemical moieties added to the structure (C)</p> Signup and view all the answers

What is responsible for the antipseudomonal activity of fluoroquinolones?

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

Which enzyme do fluoroquinolones inhibit to prevent the relaxation of positively supercoiled DNA?

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

What is the best predictor for clinical efficacy of fluoroquinolones?

<p>Ratio of exposure to the drug (AUC) to minimum inhibitory concentration (MIC) (A)</p> Signup and view all the answers

Which fluoroquinolone has significant activity against anaerobic organisms?

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

What has eroded the utility of fluoroquinolones according to the text?

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

Which enzyme is mutated in organisms that develop resistance to fluoroquinolones?

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

Why does the CDC no longer recommend fluoroquinolones for gonorrhea treatment?

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

What is the main factor associated with clinical failures and resistance development in bacteria?

<p>$AUC:MIC$ less than 125 for gram-negative bacteria and less than 30 for gram-positive bacteria (B)</p> Signup and view all the answers

Which population group is at high risk of developing tendon rupture when taking fluoroquinolones?

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

What is the primary reason why lactating women should use fluoroquinolones sparingly?

<p>To decrease the risk of tendon rupture (B)</p> Signup and view all the answers

Which fluoroquinolone is detected in breast milk but ingested in small doses by infants?

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

What is the recommended use of fluoroquinolones in patients younger than 18 years according to the FDA?

<p>For complicated UTIs and pyelonephritis (B)</p> Signup and view all the answers

Which adverse drug reaction has been reported with nearly all antibacterial agents, including fluoroquinolones?

<p>Clostridioides difficile infection (CDI) (D)</p> Signup and view all the answers

What common GI adverse reactions are associated with fluoroquinolones?

<p>Abdominal pain and altered taste (B)</p> Signup and view all the answers

What symptomatology characterizes fluoroquinolone tendinitis?

<p>Painful and swollen tendons leading to rupture (B)</p> Signup and view all the answers

What is the main recommendation by the AAP regarding the systemic use of fluoroquinolones in children?

<p>Use as a last resort against MDR bacteria (D)</p> Signup and view all the answers

What health issue has been associated with prolonged or repeated therapy of fluoroquinolones?

<p>Bacterial or fungal overgrowth of nonsusceptible organisms (D)</p> Signup and view all the answers

Which fluoroquinolones are known to penetrate the placenta?

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

Which fluoroquinolone is known to have minimal metabolism and predominant renal excretion?

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

What side effect is specifically mentioned as a concern for patients with myasthenia gravis taking fluoroquinolones?

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

Why are dosage adjustments necessary for most fluoroquinolones in patients with CrCl of 50 mL/min or less?

<p>Due to renal impairment (C)</p> Signup and view all the answers

Which warning was published by the FDA regarding fluoroquinolone antibiotic use in 2018?

<p>Aortic dissection or aneurysm occurrence (D)</p> Signup and view all the answers

What is the predominant route of elimination for nalidixic acid and moxifloxacin?

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

What precautions should patients on fluoroquinolones take to prevent adverse reactions related to photosensitivity?

<p>Avoid direct sunlight, sun lamps, and tanning beds during therapy and several days after completion. (B)</p> Signup and view all the answers

What action should patients take if they experience tenderness or inflammation in any tendon while on a fluoroquinolone?

<p>Discontinue the fluoroquinolone, notify the prescriber, rest, and refrain from exercising the affected joint. (A)</p> Signup and view all the answers

What is the recommended daily fluid intake to prevent crystalluria while on fluoroquinolones?

<p>$1,500$ mL per day (D)</p> Signup and view all the answers

When should diabetic patients report any signs or symptoms of hypoglycemia while on fluoroquinolones?

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

What should patients do at any sign of an allergic reaction (hives, itching, dyspnea) while on a fluoroquinolone?

<p>Discontinue the drug immediately. (C)</p> Signup and view all the answers

What is the recommended action for patients experiencing dizziness or lightheadedness while on fluoroquinolones?

<p>Avoid driving and hazardous activities until the patient's reaction is known. (B)</p> Signup and view all the answers

What is a significant implication to consider when selecting fluoroquinolones?

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

Which fluoroquinolone may be a cost-effective choice due to being on multiple $4 or reduced cost generic lists?

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

What is a reason to use fluoroquinolones judiciously?

<p>To prevent resistance (B)</p> Signup and view all the answers

Which fluoroquinolone is unique as an oral agent effective for P. aeruginosa?

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

Which fluoroquinolone achieves a much higher AUC:MIC ratio than levofloxacin and ciprofloxacin?

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

What should be monitored for patients on prolonged therapy with fluoroquinolones?

<p>Organ function, including renal, hepatic, and hematopoietic function (A)</p> Signup and view all the answers

What effect can dehydration lead to in patients taking fluoroquinolones?

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

Why should fluoroquinolones not be taken within 2 to 6 hours of certain drugs?

<p>To prevent absorption issues due to chelation (B)</p> Signup and view all the answers

Which group should avoid using fluoroquinolones unless there are compelling reasons?

<p>Children and pregnant women (D)</p> Signup and view all the answers

What should patients understand about taking antimicrobial drugs like fluoroquinolones?

<p>All doses must be taken and the full course must be completed. (C)</p> Signup and view all the answers

What is a black box warning associated with the use of fluoroquinolones?

<p>Risk of tendonitis and tendon rupture (C)</p> Signup and view all the answers

Which enzyme is inhibited by ciprofloxacin, leading to increased drug levels of caffeine, zolpidem, and other drugs?

<p>CYP1A2 (C)</p> Signup and view all the answers

Why should dairy products not be consumed concurrently with ciprofloxacin?

<p>They decrease the drug's absorption (B)</p> Signup and view all the answers

Which fluoroquinolone is specifically mentioned as increasing cyclosporine's nephrotoxic effects?

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

Why are fluoroquinolones no longer recommended as first-line treatment for simple UTIs?

<p>Due to antibiotic resistance issues (B)</p> Signup and view all the answers

In which condition are fluoroquinolones considered first-line therapy for treatment?

<p>Community-acquired pneumonia (B)</p> Signup and view all the answers

What is the recommended self-treatment for traveler’s diarrhea involving fluoroquinolones?

<p>$500 mg of oral ciprofloxacin combined with loperamide (C)</p> Signup and view all the answers

Why does the FDA recommend against using fluoroquinolones for acute bacterial sinusitis?

<p>Owing to a high incidence of serious adverse reactions (C)</p> Signup and view all the answers

'Ciprofloxacin should not be used as chemoprophylaxis in pregnant women or children younger than age 18 years' - Why?

<p>'safer options of ceftriaxone or azithromycin available' (C)</p> Signup and view all the answers

'Ciprofloxacin may be used off-label as a single 500 mg dose as chemoprophylaxis for high-risk adult contacts' - What should be considered before using ciprofloxacin for this purpose?

<p>'confirmed susceptibility on culture and sensitivity' (A)</p> Signup and view all the answers

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