PTCB Updated PTCE Exam Questions and Answers by belle

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.

Comprehensive and Detailed Step-by-Step Explanation:

Shingrix (Zoster Vaccine Recombinant)must be stored in therefrigerator (2°C to 8°C / 36°F to 46°F)and shouldnever be frozen.

????Explanation of Answer Choices:✅C. Shingrix that was stored in a freezer→Correct.Shingrixloses potencywhen frozen.❌A. Boostrix (Tdap) stored in a refrigerator→ Incorrect.Proper storage condition.❌B. Havrix (Hepatitis A vaccine) stored in a refrigerator→ Incorrect.Proper storage condition.❌D. Varivax (Varicella vaccine) stored in a freezer→ Incorrect.Varivax must be stored frozen (-50°C to -15°C).

????Reference:

CDC Vaccine Storage & Handling Guidelines

USP <1079>: Vaccine Storage

Comprehensive and Detailed Step-by-Step Explanation:

Acetaminophen (Tylenol)is metabolized by theliver.Excessive doses or concurrentalcohol useincreases the risk ofliver damage (hepatotoxicity).

????Explanation of Answer Choices:✅D. Alcoholic beverages→Correct. Alcohol and acetaminophen together can causesevere liver damage.❌A. Citrus fruits→ Incorrect. Citrus does not interfere withacetaminophen metabolism.❌B. Leafy greens→ Incorrect. Leafy greens affectwarfarin, notacetaminophen.❌C. Dairy products→ Incorrect. Dairy does not interact withacetaminophen.

????Reference:

FDA Acetaminophen Warnings

PTCB Medication Safety Guidelines

Famotidine suspension is stable for 21 days when stored in the refrigerator (2°C–8°C or 36°F–46°F).

????Reference:FDA Famotidine Stability Guidelines, USP Storage Guidelines.