Pharmaceutical Sciences & Calculations Flashcards
6 cards from real GPHC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Pharmaceutical Sciences & Calculations flashcards as text
A patient weighing 70 kg requires a drug at 5 mg/kg/day in two divided doses. What is each dose?
Answer: 175 mg
Total daily dose = 70 × 5 = 350 mg. Divided into 2 doses: 350 ÷ 2 = 175 mg per dose.
An infusion of 500 mg in 250 mL is running at 50 mL/hour. What is the rate in mg/hour?
Answer: 100 mg/hour
Concentration = 500/250 = 2 mg/mL. Rate = 2 mg/mL × 50 mL/hour = 100 mg/hour.
Which excipient acts as a preservative in multi-dose eye drops?
Answer: Benzalkonium chloride
Benzalkonium chloride (BAC) is the most commonly used preservative in multi-dose ophthalmic preparations. It prevents microbial contamination.
What is the purpose of an enteric coating on a tablet?
Answer: To prevent dissolution in gastric acid
Enteric coatings resist gastric acid and dissolve in the higher pH of the small intestine, protecting acid-labile drugs or preventing gastric irritation.
A solution has a pH of 3. What does this indicate?
Answer: Acidic solution
pH below 7 indicates an acidic solution. pH 7 is neutral; above 7 is alkaline. pH 3 is strongly acidic.
Which property of a drug most influences its ability to cross the blood-brain barrier?
Answer: Lipophilicity
Lipophilic (fat-soluble) drugs cross the blood-brain barrier more readily because the barrier is composed mainly of lipid bilayer membranes.
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Sources & references
Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy
- pharmacyregulation.org — Eligibility, exam dates, fees, registration deadline, score release, exam information · verified Oct 2026
- psni.org.uk — Retake policy · verified Oct 2026
- assets.pharmacyregulation.org — Test delivery, exam format, passing score, time limit · verified Oct 2026