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Pharmacological and Parenteral Therapies

NCLEX Antibiotic Practice Questions

Quick answer

Antibiotic questions on the NCLEX test whether you know the one dangerous side effect, the one food or drug interaction, and the one teaching point for each major drug class. They sit inside Pharmacological and Parenteral Therapies, which makes up roughly 13 to 19 percent of the exam, and antibiotics are one of the most common drug groups tested in that section.

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Most students study antibiotics by trying to memorize every drug name, and that is the trap. The NCLEX does not care if you can spell tobramycin. It cares whether you know that tobramycin can wreck a client's hearing and kidneys, and what you would check before giving the next dose. Learn each class by its signature harm (ototoxicity, tendon rupture, C. diff, liver damage) and its signature teaching point (no dairy, no alcohol, finish the bottle), and the questions start to feel predictable. The other place students lose points is sequencing. The culture gets drawn before the first dose, every time, unless the client is crashing from sepsis and the order says otherwise.

Practice questions

1

A client is receiving IV gentamicin every 8 hours for a gram-negative infection. The nurse is told to obtain a trough level. When should the nurse draw the blood sample?

  1. A30 minutes after the infusion finishes
  2. BHalfway between two doses
  3. CJust before the next scheduled dose
  4. D1 hour after the infusion starts
Show answer

Answer: C

A trough is the lowest drug concentration in the blood, which happens right before the next dose is given. Drawing it then tells the provider whether the drug is being cleared or is building up to toxic levels.

Why the others are wrong

A measures the peak, not the trough. B and D give a random mid-level value that cannot be interpreted against the reference range and could lead to a wrong dose adjustment.

2

A client on day 6 of IV tobramycin tells the nurse, "My ears have been ringing since yesterday and the TV sounds muffled." Which action should the nurse take first?

  1. AReassure the client that this is a temporary side effect
  2. BHold the next dose and notify the provider
  3. CGive the dose and document the complaint
  4. DIrrigate the client's ears with warm saline
Show answer

Answer: B

Tinnitus and reduced hearing are early signs of aminoglycoside ototoxicity, and the damage to the eighth cranial nerve can become permanent if the drug continues. The nurse holds the dose and reports it so the provider can check levels and change therapy.

Why the others are wrong

A is false, because aminoglycoside hearing loss is often irreversible. C lets the damage progress. D treats a symptom that is not caused by anything in the ear canal and delays the real action.

3

A client with a documented anaphylactic reaction to penicillin is prescribed cefazolin before surgery. Which action should the nurse take?

  1. AGive the cefazolin as ordered, since it is a different drug class
  2. BGive half the dose and watch for a reaction
  3. CContact the provider to clarify the order before giving the drug
  4. DPremedicate with diphenhydramine and give the full dose
Show answer

Answer: C

Cephalosporins share a beta-lactam ring with penicillins, and a client with a true anaphylactic penicillin allergy has a small but real risk of cross-reactivity. The nurse should question the order and let the provider decide whether to proceed or switch drugs.

Why the others are wrong

A ignores the cross-sensitivity risk. B is not a safe test for anaphylaxis, which can happen with any amount. D does not prevent anaphylaxis and is not something a nurse decides independently.

4

A nurse is teaching a 19-year-old client who was just prescribed doxycycline for acne. Which statement by the client shows the teaching was understood?

  1. A"I will take it with a glass of milk so it does not upset my stomach."
  2. B"I need to wear sunscreen and avoid tanning while I am on this."
  3. C"I should take it right before bed and lie down so it absorbs better."
  4. D"I can stop taking it as soon as my skin clears up."
Show answer

Answer: B

Tetracyclines cause photosensitivity, so clients burn far more easily and need sunscreen, protective clothing and no tanning beds. This is the single most tested teaching point for the class.

Why the others are wrong

A is wrong because calcium in dairy binds the drug and blocks absorption; it should be taken with a full glass of water, separated from dairy and antacids. C increases the risk of esophageal irritation, so the client should stay upright for at least 30 minutes. D leads to relapse and resistance.

5

A 26-year-old client who is 10 weeks pregnant has a prescription for tetracycline for a skin infection. Which action should the nurse take?

  1. AAdminister the medication and teach about photosensitivity
  2. BQuestion the order with the prescribing provider
  3. CGive the medication with food to reduce nausea
  4. DAsk the client to use contraception while on the drug
Show answer

Answer: B

Tetracyclines cross the placenta and deposit in developing bone and teeth, causing permanent tooth discoloration and possible slowed bone growth in the fetus. The drug is avoided in pregnancy and in children under 8, so the nurse should question the order.

Why the others are wrong

A and C both proceed with an unsafe drug. D misses the point, because the client is already pregnant and the concern is the fetus, not future pregnancy.

6

A 68-year-old client on oral ciprofloxacin for a urinary tract infection calls the clinic and reports sudden pain and swelling at the back of the ankle that started during a walk. Which instruction should the nurse give?

  1. A"Apply heat and keep walking to work out the stiffness."
  2. B"Stop the medication, rest the leg, and come in to be seen today."
  3. C"This is a normal muscle ache. Take ibuprofen and finish the course."
  4. D"Take the next dose with food and call back if it is not better in a week."
Show answer

Answer: B

Fluoroquinolones carry a boxed warning for tendinitis and tendon rupture, most often the Achilles tendon, and the risk is higher in clients over 60 and those on corticosteroids. Sudden heel or calf pain means stop the drug, stop weight bearing, and get evaluated.

Why the others are wrong

A and C keep the client loading a tendon that may be about to rupture. D delays assessment for a week, which could turn a partial tear into a complete rupture.

7

A client is starting metronidazole for trichomoniasis. Which point is most important for the nurse to include in the teaching?

  1. AAvoid alcohol during treatment and for at least 72 hours after the last dose
  2. BTake the medication on an empty stomach for best absorption
  3. CExpect the urine to turn bright orange
  4. DAvoid direct sunlight while taking the drug
Show answer

Answer: A

Metronidazole combined with alcohol causes a disulfiram-like reaction with flushing, pounding headache, vomiting and a racing heart. The client should avoid all alcohol, including mouthwash and cough syrups that contain it, during therapy and for about 3 days after.

Why the others are wrong

B is backwards, because metronidazole is better tolerated with food. C describes rifampin, not metronidazole (metronidazole may darken urine to a reddish-brown but orange body fluids are a rifampin finding). D belongs to tetracyclines and fluoroquinolones.

8

A client who finished a 10-day course of clindamycin 4 days ago calls to report 6 to 8 watery stools a day, abdominal cramping and a low-grade fever. Which response by the nurse is correct?

  1. A"Take loperamide after each loose stool until it stops."
  2. B"Drink clear fluids and it should pass in a day or two."
  3. C"This may be a serious bowel infection. You need to be seen today and have a stool sample tested."
  4. D"Restart the clindamycin, because the infection has come back."
Show answer

Answer: C

Clindamycin is one of the antibiotics most strongly linked to Clostridioides difficile infection, which can appear during therapy or weeks after it ends. Frequent watery stools with cramping and fever need a stool test for C. diff and treatment, usually with oral vancomycin or fidaxomicin.

Why the others are wrong

A is dangerous, because antimotility drugs can trap toxin in the colon and raise the risk of toxic megacolon. B underestimates a potentially life-threatening infection. D would make C. diff worse, since clindamycin caused it.

9

A client with newly diagnosed pulmonary tuberculosis is starting isoniazid and rifampin. Which statement by the client indicates a need for more teaching?

  1. A"My tears and urine may turn orange, and it could stain my contact lenses."
  2. B"I should call right away if my skin or eyes look yellow or I lose my appetite."
  3. C"I will keep taking these for at least 6 months, even when I feel better."
  4. D"Since the orange color means the drug is working, I can skip my liver blood tests."
Show answer

Answer: D

Both isoniazid and rifampin are hepatotoxic, and orange secretions are a harmless dye effect of rifampin, not a sign of effectiveness. The client needs baseline and ongoing liver function tests and must report jaundice, dark urine, nausea or right upper quadrant pain.

Why the others are wrong

A, B and C are all correct. Rifampin turns body fluids orange and stains soft lenses, liver symptoms must be reported, and TB therapy runs 6 months or longer to prevent resistance.

10

A client in the emergency department has a fever of 102.6 F, chills and flank pain. The provider orders a urinalysis, urine culture and sensitivity, and ceftriaxone 1 g IV once. Which action should the nurse take first?

  1. AHang the ceftriaxone, since the client is febrile
  2. BCollect the urine specimen for culture, then give the ceftriaxone
  3. CGive acetaminophen for the fever and wait for the culture result before starting the antibiotic
  4. DAsk the provider to change the order to an oral antibiotic
Show answer

Answer: B

The culture must be collected before the first antibiotic dose, because once the drug is on board it can suppress bacterial growth and give a false negative or an incomplete sensitivity result. Collecting the specimen first takes only a few minutes and does not meaningfully delay treatment.

Why the others are wrong

A gives the antibiotic first and can ruin the culture. C delays treatment for days while a possible pyelonephritis spreads. D is not the nurse's call and does not address the sequencing problem.

Quick tips

  • Trough is drawn right before the dose, peak is drawn about 30 minutes after an IV infusion ends. If the trough is high, the kidneys are not clearing the drug.
  • Aminoglycosides (gentamicin, tobramycin, amikacin) are "mycin" drugs that hit the ears and the kidneys. Ringing ears, muffled hearing, dizziness or rising creatinine means hold and call.
  • Memorize the one lifestyle rule per class: tetracyclines mean no dairy and no sun, metronidazole means no alcohol, fluoroquinolones mean no heavy exercise if a tendon hurts.
  • Anything "floxacin" plus a client over 60 or on prednisone is a tendon rupture question waiting to happen.
  • Rifampin turns everything orange and that is fine. Yellow skin, dark urine or loss of appetite on any TB drug is not fine and needs to be reported the same day.
  • Culture first, antibiotic second, finish the whole course third. If the stem asks what to do first and a culture has not been drawn, that is usually the answer.

Related topics

FAQ

how many antibiotic questions are on the nclex

There is no fixed number. Antibiotics appear inside the Pharmacological and Parenteral Therapies category, which is about 13 to 19 percent of the test, and most candidates see a handful of antibiotic items mixed in with other drug questions.

do i need to know every antibiotic name for nclex

No. Focus on the major classes and their endings: "mycin" for aminoglycosides, "cillin" for penicillins, "cef" or "ceph" for cephalosporins, "cycline" for tetracyclines, "floxacin" for fluoroquinolones. Then learn the one toxicity and one teaching point for each.

can a client with a penicillin allergy take cephalosporins

It depends on the type of reaction. A mild rash years ago is usually not a barrier, but a true anaphylactic reaction means the provider needs to weigh the cross-sensitivity risk. On the exam, if the stem says anaphylaxis to penicillin and the order is a cephalosporin, question the order.

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