NCLEX Pharmacology: Antibiotics

What is the primary mechanism of action for penicillin antibiotics?

Penicillins disrupt bacterial cell wall synthesis, leading to cell lysis and bacterial death.

What important allergy consideration should a nurse be aware of when administering cephalosporins?

Patients with a severe penicillin allergy may have a cross-sensitivity reaction to cephalosporins due to structural similarities.

A patient on azithromycin reports severe abdominal cramping and diarrhea. What serious complication should the nurse assess for?

The nurse should assess for Clostridioides difficile (C. diff) infection, a potential superinfection from macrolide use.

What two key patient teaching points are essential for a patient prescribed doxycycline?

Advise the patient to avoid sun exposure (photosensitivity) and not take antacids or dairy products within 2 hours of the medication.

What are the two primary toxicities associated with aminoglycoside antibiotics like gentamicin, and what monitoring is essential?

Aminoglycosides are associated with ototoxicity (hearing/balance impairment) and nephrotoxicity (kidney damage). Peak and trough levels are monitored to ensure therapeutic efficacy and minimize toxicity.

A patient on ciprofloxacin reports new tendon pain and swelling. What severe adverse effect should the nurse suspect?

The nurse should suspect tendon rupture, a serious adverse effect particularly involving the Achilles tendon, associated with fluoroquinolone antibiotics.

A patient receiving IV vancomycin develops sudden flushing, rash, and hypotension. What is this reaction called, and what is the nursing intervention?

This is Red Man Syndrome, a histamine-release reaction. The nurse should slow the infusion rate and administer antihistamines as prescribed.

What serious dermatological adverse effect is a concern with sulfonamide antibiotics (e.g., trimethoprim-sulfamethoxazole)?

Stevens-Johnson Syndrome (SJS), a severe skin reaction, is a serious concern with sulfonamide antibiotics.

A patient prescribed metronidazole (Flagyl) for a C. diff infection asks if they can drink alcohol. What is the nurse's response?

The nurse must instruct the patient to avoid all alcohol and alcohol-containing products during and for at least 3 days after metronidazole therapy to prevent a disulfiram-like reaction.

What is a common and severe gastrointestinal adverse effect associated with clindamycin?

Clindamycin is highly associated with the development of Clostridioides difficile (C. diff) infection.

For a patient taking linezolid, what interaction should the nurse be aware of if the patient is also on selective serotonin reuptake inhibitors (SSRIs)?

The nurse should monitor for signs of serotonin syndrome, as linezolid has weak MAOI properties and can interact with SSRIs.

What is a key nursing consideration for administering carbapenem antibiotics like imipenem-cilastatin, especially concerning allergies?

Assess for a history of penicillin allergy, as there is a potential for cross-reactivity with carbapenems.

A patient is receiving amphotericin B for a severe systemic fungal infection. What two major organ toxicities are primary concerns for the nurse?

The nurse should monitor for nephrotoxicity (kidney damage) and hepatotoxicity (liver damage), common severe adverse effects of amphotericin B.

Before initiating antibiotic therapy, what critical nursing action should always be performed?

A culture and sensitivity (C&S) test should be performed to identify the causative organism and determine its susceptibility to specific antibiotics.

What is a "superinfection," and what are two common examples that a nurse should monitor for in a patient on broad-spectrum antibiotics?

A superinfection is a new infection that develops during antibiotic treatment due to the eradication of normal flora. Common examples include C. difficile colitis and oral or vaginal candidiasis.