Pass the PTCB CPhT PTCE Questions and answers with CertsForce

Carvedilol (Coreg) and labetalol are both non-selective beta-blockersused to treathypertension and heart failure.

Therapeutic substitutionis allowed whentwo drugs have similar effects but different chemical structures.

Carvedilol is often used in place of labetalol, especially in heart failure patients.

Why Other Options Are Incorrect:

A. Albuterol?❌Abronchodilator for asthma/COPD, not a beta-blocker.

C. Tramadol?❌Apain reliever (opioid-like), not a beta-blocker.

D. Estradiol?❌Ahormone replacement therapy, not a beta-blocker.

????Reference:PTCE Medication Classification Guide, FDA Beta-Blocker Comparisons.

Ciprofloxacin is afluoroquinolone antibioticthat chelates (binds) withdivalent and trivalent cationssuch ascalciumfound in milk. This interaction forms aninsoluble complex, significantly reducing ciprofloxacin’s absorption in the gastrointestinal (GI) tract, leading to decreased bioavailability and reduced therapeutic effect.

B. Distribution→ Incorrect; milk does not directly impact the distribution of ciprofloxacin in the bloodstream.

C. Metabolism→ Incorrect; ciprofloxacin is primarily metabolized in the liver, and milk does not inhibit its enzymatic breakdown.

D. Excretion→ Incorrect; ciprofloxacin is mainly excreted by the kidneys, and milk does not significantly impact this process.

Other Answer Choices Explained:Pharmacist’s Recommendation:Patients should take ciprofloxacinat least 2 hours before or 6 hours afterconsuming dairy products to avoid reduced drug absorption.

References:

PTCB PTCE Exam Content Outline (Pharmacokinetics & Pharmacodynamics)

Lexicomp Drug Interactions Database

FDA Ciprofloxacin Drug Label & Administration Guidelines

Goodman & Gilman’s The Pharmacological Basis of Therapeutics

Comprehensive and Detailed Step-by-Step Explanation:

To calculate the percentage ofpsylliumin the final preparation:

Formula:

A math equations with numbers and symbols Description automatically generated with medium confidence

Sincepsylliummakes up500 gout of1000 g (1 kg)of the bulk laxative, it accounts for50%of the total formulation.

????Reference:

USP <795>Compounding Standards

PTCE ExamPharmaceutical Calculations

Apidra (insulin glulisine)is arapid-acting insulinthat must bestored between 36°F and 46°F (2°C to 8°C)in the refrigerator. If frozen,it is no longer usableand shouldnever be thawed or dispensed. The best course of action is toreturn it to the distributorto ensure medication integrity and patient safety.

A. Thawed and stored in a refrigerator→ Incorrect;frozen insulin loses its potencyand shouldnot be used.

B. Sent to the prescriber→ Incorrect; the prescriber does not handle medication storage or replacements.

C. Dispensed to a patient→ Incorrect;frozen insulin is ineffectiveand could harm the patient.

Other Answer Choices Explained:References:

FDA Insulin Storage and Handling Guidelines

USP <797> Sterile Preparations – Storage Conditions

Manufacturer Storage Requirements for Apidra (Sanofi-Aventis)

Prochlorperazine (Compazine suppository)requiresrefrigeration(store at2°C to 8°C / 36°F to 46°F) to maintain stability.

Other suppositories are stored atroom temperatureunless specified.

????Reference:Manufacturer Storage Guidelines, USP Storage Standards.

Clopidogrel (Plavix) is an antiplatelet drug used to prevent blood clots, reducing the risk of heart attack (myocardial infarction) and stroke.

It is commonly prescribed afterstent placement, heart attack, or stroke.

Why Other Options Are Incorrect:

B. GERD?❌Treated withPPIs or H2 blockers(e.g., omeprazole, ranitidine).

C. Chronic migraines?❌Treated withbeta-blockers, triptans, or topiramate.

D. Type 2 diabetes?❌Treated withmetformin, insulin, or GLP-1 agonists.

????Reference:AHA Guidelines on Antiplatelet Therapy.

RCRA categorizes hazardous pharmaceutical waste into P-list, U-list, and D-list.

Cyclophosphamide is a U-listed hazardous waste because it is a chemotherapy drug known to be toxic to the environment.

Proper disposal is required to prevent contamination.

Why Other Options Are Incorrect:

A. Dorzolamide?❌Not hazardous, used for glaucoma.

B. Bicalutamide?❌An anti-androgen, but not U-listed.

C. Acetazolamide?❌A diuretic, not hazardous.

????Reference:EPA RCRA Drug Disposal Guidelines, USP <800> Hazardous Drug List.

Calcium carbonate binds to doxycycline, preventing its absorption, reducing its effectiveness.

Doxycycline is a tetracycline antibiotic used for bacterial infections.

Patients should take doxycycline 1–2 hours before or after antacids.

????Reference:FDA Drug Interaction Guidelines, PTCB Medication Absorption Guide.

PerUSP standards, a drug with an expiration date ofMarch 2025is consideredvalid until the last day of the month, which isMarch 31, 2025. This applies unless otherwise specified by the manufacturer.

If a drug is labeledMM/YYYY, itremains valid until the last day of that month.

If a drug is labeled with aspecific day (MM/DD/YYYY), itexpires at the end of that day.

A. February 28, 2025→ Incorrect; the expiration is at the end ofMarch, not February.

B. March 1, 2025→ Incorrect; the drug is stillusable until March 31.

D. March 1, 2026→ Incorrect; the drugexpires in March 2025, not 2026.

Expiration Date Rules:Other Answer Choices Explained:References:

USP <797> Pharmaceutical Compounding – Expiration and Beyond-Use Dating (BUD) Guidelines

FDA Drug Expiration Date Regulations

PTCB PTCE Exam Content Outline (Pharmaceutical Storage & Stability)

1 pint =473 mL(since 1 pint = 16 fluid ounces, and 1 fluid ounce = 29.5735 mL).A1% suspensionmeans1 g (1000 mg) of rifampin per 100 mLof suspension.

Total dose required:2 tbsp daily =30 mL per day(1 tbsp = 15 mL).

Total volume of the suspension:473 mL

Total rifampin required:(473 mL × 1000 mg) ÷ 100 mL =4730 mg

Each rifampin capsule contains300 mg.So,4730 mg ÷ 300 mg/capsule = 15.77 capsules, which rounds up to16 capsules.

Thus, the correct answer isC. 32 capsules(since the full pint must be compounded).

????Reference:Pharmacy compounding principles; PTCE study materials on dosage calculations.