Pharmacology

1. A patient is prescribed lisinopril 10 mg daily for hypertension. Which classification does this medication belong to?

Lisinopril is an ACE inhibitor; drugs in this class typically end in '-pril' and work by blocking the conversion of angiotensin I to angiotensin II. ARBs end in '-sartan' (losartan), beta-blockers end in '-olol' (metoprolol), and calcium channel blockers include drugs like amlodipine and diltiazem.

2. A physician orders 500 mg of amoxicillin PO. The pharmacy supplies 250 mg tablets. How many tablets should the medical assistant prepare?

Using the formula (Desired/Available) × Quantity: (500 mg / 250 mg) × 1 tablet = 2 tablets. One tablet would only deliver 250 mg, three tablets would deliver 750 mg, and 1/2 tablet would deliver only 125 mg.

3. Which of the following is considered one of the 'six rights' of medication administration?

The six rights of medication administration are: right patient, right drug, right dose, right route, right time, and right documentation. Pharmacy, insurance, and prescriber are not part of the six rights, though verifying the prescriber's order is part of preparing to administer.

4. A medical assistant is administering a sublingual nitroglycerin tablet to a patient with angina. What is the correct administration technique?

Sublingual medications are placed under the tongue and allowed to dissolve for rapid absorption through the oral mucosa. Placing medication between the cheek and gum is the buccal route, while chewing or swallowing would delay onset and reduce effectiveness of sublingual nitroglycerin.

5. According to the CDC childhood immunization schedule, at what age is the first dose of the MMR vaccine typically administered?

The first dose of MMR (measles, mumps, rubella) is routinely given at 12-15 months of age, with the second dose at 4-6 years. MMR is a live vaccine that is not effective if given too early due to maternal antibodies still present in younger infants.

6. A patient taking warfarin should be monitored using which laboratory test?

Warfarin therapy is monitored using PT/INR, with typical therapeutic INR ranges of 2.0-3.0 for most indications. PTT is used to monitor heparin therapy, while CBC and BMP are general labs not specific to warfarin monitoring.

7. A medical assistant discovers that a vaccine refrigerator temperature has been out of the recommended range overnight. What is the appropriate first action?

When a cold chain breach occurs, vaccines should be marked 'DO NOT USE,' quarantined (but not discarded), and the manufacturer or state health department should be contacted for viability determination. Vaccines should never be discarded without proper evaluation or moved to inappropriate storage.

8. Which of the following medications is considered a high-alert medication requiring extra safety precautions?

Insulin is classified as a high-alert medication by the Institute for Safe Medication Practices (ISMP) because errors in dosing can cause significant patient harm, including severe hypoglycemia or death. Acetaminophen, diphenhydramine, and docusate at standard OTC doses are not on the high-alert list.

9. A physician orders 250 mg of a medication for a child weighing 22 lb. The recommended dose is 25 mg/kg/day. Is this dose safe?

First convert 22 lb to kg: 22 ÷ 2.2 = 10 kg. Then calculate the recommended dose: 10 kg × 25 mg/kg = 250 mg/day. The ordered dose matches the recommended dose exactly, so it is safe.

10. A medical assistant is instructing a patient on the correct use of a metered-dose inhaler (MDI). Which instruction is correct?

Proper MDI technique involves shaking the inhaler, exhaling fully, then inhaling slowly and deeply while pressing down on the canister, followed by holding the breath for approximately 10 seconds to allow medication deposition in the lungs. Rapid shallow breathing or exhaling into the device reduces medication delivery.

1. What information must be provided to a patient (or guardian) before administering a vaccine?

Federal law under the National Childhood Vaccine Injury Act requires that a current Vaccine Information Statement (VIS) be provided to the patient, parent, or legal guardian before administering certain vaccines. Prescriptions, waivers, and package inserts are not the required documents.

2. Which route of administration typically has the fastest onset of action?

IV administration delivers medication directly into the bloodstream, resulting in the fastest onset of action. Oral medications must pass through digestion and first-pass metabolism, while IM and SubQ routes require absorption from tissue, making them slower.

3. A patient refuses to take their prescribed oral medication. What should the medical assistant document in the eMAR?

Medication refusals must be documented in the eMAR including the time, the reason for refusal (if given), and notification of the healthcare provider. Never document a medication as given if it was refused, and never administer against a competent patient's wishes.

4. A medical assistant accidentally administers 20 mg of a medication when the order was for 10 mg. What is the appropriate next action?

Medication errors must be reported immediately to the provider, the patient must be monitored for adverse effects, and an incident report must be completed per facility policy. Concealing errors is unethical, illegal, and endangers patient safety.

5. Which class of antibiotics is most likely to cause a cross-reactive allergic reaction in a patient with a documented penicillin allergy?

Cephalosporins share a similar beta-lactam ring structure with penicillins, which can result in cross-reactivity in patients with penicillin allergies (though the rate is low, around 1-10%). Macrolides, fluoroquinolones, and tetracyclines have different structures and are generally safe for penicillin-allergic patients.

6. The half-life of a medication refers to:

Half-life is defined as the amount of time required for the plasma concentration of a drug to decrease by 50%, indicating how long it takes for half the drug to be eliminated from the body. This is different from onset (time to begin working), peak (time of maximum effect), and duration (length of therapeutic effect).

7. When administering an intramuscular injection to an adult in the deltoid muscle, which needle length and gauge are typically appropriate?

For an adult IM injection in the deltoid, a 1 to 1.5 inch needle with a 22-25 gauge is typically appropriate to reach the muscle tissue. A 5/8 inch needle is used for SubQ injections, and 1/2 inch, 27 gauge is used for intradermal injections.

8. A patient experiences swelling of the face and throat, difficulty breathing, and hives within minutes of receiving a vaccine. What is the medical assistant's most appropriate immediate action?

These symptoms indicate anaphylaxis, a life-threatening emergency requiring immediate activation of the emergency response system and administration of epinephrine, which is the first-line treatment. Oral antihistamines act too slowly, and delay in treatment can be fatal.

9. Which of the following is required documentation when dispensing a controlled substance from a clinic's inventory?

Controlled substance logs require comprehensive documentation including patient name, drug, dose, date/time, prescriber, staff member administering, and an accurate running inventory count with witness signatures for waste, as required by the DEA. Incomplete documentation is a serious regulatory violation.

10. A physician orders 1,000 mL of normal saline to infuse over 8 hours. Using tubing with a drop factor of 15 gtt/mL, what is the correct IV drip rate in drops per minute?

The formula is (Total Volume × Drop Factor) ÷ (Total Time in minutes). (1,000 mL × 15 gtt/mL) ÷ (8 hours × 60 min) = 15,000 ÷ 480 = 31.25, rounded to 31 gtt/min. The other choices reflect calculation errors in time or drop factor.

1. A patient is prescribed lisinopril 10 mg PO daily for hypertension. Which drug classification does lisinopril belong to?

Lisinopril is an ACE inhibitor, identifiable by the '-pril' suffix. Beta-blockers end in '-olol' (metoprolol), calcium channel blockers often end in '-dipine' (amlodipine), and ARBs end in '-sartan' (losartan).

2. The provider orders 500 mg of amoxicillin PO. The medication is available as 250 mg/5 mL oral suspension. How many mL should the medical assistant administer?

Using the formula (Desired/Available) x Volume: (500 mg/250 mg) x 5 mL = 10 mL. Five mL would only deliver 250 mg, and 15 or 20 mL would exceed the ordered dose.

3. A medical assistant is administering a subcutaneous injection of insulin. What is the correct angle of needle insertion for most adult patients?

Subcutaneous injections are given at a 45- to 90-degree angle depending on the patient's body fat and needle length. A 15-degree angle is used for intradermal injections, and parallel/10-degree insertion is not standard for any injection route.

4. Which of the following is considered one of the 'six rights' of medication administration?

The six rights of medication administration are right patient, right drug, right dose, right route, right time, and right documentation. Pharmacy, insurance, and prescriber are not among the six rights.

5. A 2-month-old infant is at the clinic for well-child immunizations. According to the CDC schedule, which of the following vaccines is typically administered at this visit?

Rotavirus vaccine is given at 2 months (with additional doses at 4 and 6 months). MMR and varicella are first given at 12–15 months, and HPV is administered starting at age 9–11 years.

6. A patient taking warfarin should be monitored with which laboratory test?

Warfarin therapy is monitored using PT/INR to ensure therapeutic anticoagulation. aPTT is used to monitor heparin therapy, A1C monitors diabetes control, and platelet count alone does not assess warfarin's effect.

7. A medical assistant discovers that a vaccine was accidentally left out of the refrigerator overnight. What is the appropriate first action?

When a cold chain break occurs, the vaccine should be labeled 'Do Not Use,' isolated from other vaccines, and the manufacturer or state health department contacted for guidance on viability. It should not be used or discarded until viability is determined.

8. Which route of administration provides the most rapid onset of medication action?

IV administration delivers medication directly into the bloodstream, providing the most rapid onset. Oral is the slowest due to absorption through the GI tract, and IM and SubQ routes require absorption through tissue before entering circulation.

9. A patient reports a penicillin allergy. Which class of antibiotics has the highest potential for cross-reactivity and should be used with caution?

Cephalosporins share a similar beta-lactam ring structure with penicillins and have a documented cross-reactivity risk. Macrolides, tetracyclines, and fluoroquinolones have different chemical structures and are not typically cross-reactive with penicillin allergies.

10. A medical assistant is instructing a patient on the proper use of a metered-dose inhaler (MDI). Which instruction is correct?

Proper MDI technique includes shaking the inhaler, exhaling fully, then inhaling slowly and deeply while actuating, followed by a 10-second breath hold. Exhaling into the inhaler or inhaling rapidly/shallowly reduces medication delivery to the lungs.

1. The term 'half-life' of a medication refers to:

Half-life is the time required for the plasma concentration of a drug to decrease by 50%. Time to peak concentration is a separate pharmacokinetic parameter, onset refers to when effect begins, and duration is total time of effect.

2. A patient is ordered nitroglycerin sublingual for angina. The medical assistant should instruct the patient to:

Sublingual nitroglycerin is placed under the tongue where it dissolves and is rapidly absorbed through the oral mucosa into the bloodstream. Swallowing, chewing, or crushing the tablet would reduce or eliminate its rapid therapeutic effect.

3. Which of the following medications is considered a high-alert medication requiring special safety precautions?

Insulin is classified as a high-alert medication by the Institute for Safe Medication Practices (ISMP) because of the significant risk of harm if used in error. Acetaminophen, loratadine, and docusate sodium do not carry the same level of risk.

4. A patient weighing 66 lb is prescribed a medication at 5 mg/kg. What is the correct dose?

Convert 66 lb to kg by dividing by 2.2, which equals 30 kg. Multiply 30 kg by 5 mg/kg to get 150 mg. The other options result from incorrect conversions or calculations.

5. After administering a vaccine, which of the following must be documented on the patient's immunization record according to federal law?

The National Childhood Vaccine Injury Act requires documentation of the vaccine manufacturer, lot number, date of administration, VIS edition date and date given, and the name/title of the person administering. Partial documentation does not meet federal requirements.

6. A medical assistant realizes they administered the wrong dose of a medication to a patient. What is the appropriate first action?

Medication errors must be reported immediately to the provider, the patient must be assessed for adverse effects, and an incident report must be completed. Failing to document or altering the record is unethical, illegal, and jeopardizes patient safety.

7. Which of the following signs and symptoms would indicate anaphylaxis following a vaccine administration?

Anaphylaxis is a life-threatening allergic reaction characterized by respiratory distress, hives, angioedema (tongue/throat swelling), and hypotension. Localized soreness, low-grade fever, and injection-site redness are common, expected mild reactions—not anaphylaxis.

8. A controlled substance count reveals a discrepancy at the end of a shift. What is the appropriate action?

Any discrepancy in controlled substance counts must be immediately reported to a supervisor and investigated according to DEA regulations and facility policy. Ignoring, delaying, or falsifying records is illegal and violates DEA requirements.

9. A patient is receiving metformin for type 2 diabetes. What is the primary mechanism of action of this medication?

Metformin, a biguanide, decreases hepatic glucose production and improves peripheral insulin sensitivity. Sulfonylureas stimulate pancreatic insulin release, alpha-glucosidase inhibitors block intestinal glucose absorption, and only injectable insulin replaces insulin directly.

10. A medical assistant is preparing to give an intramuscular injection to an adult in the deltoid muscle. What is the maximum volume typically recommended for this site?

The deltoid muscle can accommodate a maximum of approximately 1 mL due to its smaller size. Larger volumes (up to 3 mL) should be given in larger muscles such as the ventrogluteal or vastus lateralis; 0.1 mL is used for intradermal, and 5 mL exceeds IM recommendations.

1. A provider orders lisinopril 10 mg PO daily for a patient with hypertension. The medical assistant should counsel the patient to report which of the following common side effects?

Lisinopril is an ACE inhibitor, and a persistent dry cough is a well-known side effect due to bradykinin accumulation. Increased urination is associated with diuretics, bradycardia with beta-blockers, and constipation/dry mouth with anticholinergics—not ACE inhibitors.

2. A physician orders 500 mg of amoxicillin suspension for a pediatric patient. The available suspension is 250 mg/5 mL. How many mL should the medical assistant instruct the parent to administer per dose?

Using the formula (Desired/Available) × Volume: (500 mg / 250 mg) × 5 mL = 10 mL. The other volumes would result in under- or overdosing the patient.

3. A medical assistant is preparing to administer an intramuscular vaccine to an adult patient. Which needle length and gauge is most appropriate for deltoid IM injection in an average-weight adult?

IM injections in the deltoid of an average adult require a 1 to 1.5 inch needle with a 22-25 gauge to reach muscle tissue. A 5/8 inch needle is used for subcutaneous injections, 3/8 inch for intradermal, and an 18-gauge 2-inch needle would be inappropriately large for routine IM vaccination.

4. A medical assistant discovers that they administered the wrong dose of a medication to a patient one hour ago. What is the FIRST action the medical assistant should take?

The first priority after a medication error is patient safety—assess the patient and notify the provider so appropriate interventions can be initiated. Documentation and incident reports are important but occur after the patient has been evaluated and stabilized.

5. According to the CDC childhood immunization schedule, at which age is the first dose of the MMR (measles, mumps, rubella) vaccine routinely administered?

The first dose of MMR is routinely given at 12-15 months of age, with the second dose at 4-6 years. MMR is a live-attenuated vaccine and is not given before 12 months because maternal antibodies can interfere with the immune response.

6. A patient is prescribed nitroglycerin sublingual tablets for angina. Which instruction is most important for the medical assistant to provide?

Sublingual nitroglycerin must dissolve under the tongue, allowing rapid absorption through the oral mucosa directly into the bloodstream, bypassing first-pass metabolism. Swallowing or chewing the tablet would reduce its effectiveness because it would be broken down by the liver before reaching systemic circulation.

7. A medical assistant is preparing to administer insulin. Which of the following is considered a high-alert medication requiring an independent double-check before administration?

Insulin is classified by ISMP as a high-alert medication because errors in dosing can cause significant patient harm, including hypoglycemia and death. Acetaminophen, docusate, and multivitamins are not on the high-alert list and do not require independent double-checks under standard protocols.

8. A patient receiving warfarin therapy asks the medical assistant why they must have regular blood tests. Which laboratory test monitors the therapeutic effect of warfarin?

Warfarin is monitored using PT/INR, with a typical therapeutic INR range of 2.0-3.0 for most indications. aPTT is used to monitor heparin therapy, while CBC and BMP do not directly measure anticoagulation effect.

9. A medical assistant notices that a vaccine refrigerator temperature has risen to 50°F (10°C) overnight. What is the appropriate action?

Per CDC vaccine storage guidelines, refrigerated vaccines must be maintained between 36-46°F (2-8°C). When a temperature excursion occurs, vaccines should be labeled 'Do Not Use,' segregated (but not discarded), and the manufacturer or health department should be contacted to determine viability. Freezing refrigerated vaccines would damage them.

10. A provider orders an IV infusion of 1,000 mL normal saline to run over 8 hours. Using tubing with a drop factor of 15 gtt/mL, what is the correct drip rate in drops per minute?

The formula is (Volume × Drop factor) / Time in minutes = (1,000 mL × 15 gtt/mL) / 480 min = 15,000/480 ≈ 31 gtt/min. The other answers result from incorrect time conversions or math errors.