PTCB Exam practice tests

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UNT'21

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I'm doing a few practice tests and I'm really confused on some questions and how they got the answer. Can anyone explain to me step by step for me to understand? Thank you in advance! :)

A 14 year old boy is 5'2" and he weights 110 lbs. He's prescribed by his doctor to take 5mg/Kg of drug "A" daily. What will his dose be?
Answer is 250mg

What concentration of a sodium chloride (NaCL) solution would be Hypertonic ?
Answer is 9.000%

Your pharmacy has a 40% markup and $1.75 dispensing fee. The wholesale price for 10 sildenafil is $120.00, what will the retail price be?
Answer is $169.75

To prepare a prescription you need to measure 2.75oz. You have the following graduated cylinders available. Which would be the best cylinder to use for accuracy ?
Answer is 100 ml

A script for cough syrup reads 15ml PO Q4° PRN.
What should you type on the patients packaging ?
Answer is One tablespoon taken orally every 4 hours as needed.
(I thought that it was 15ml taken orally every 4 hours as needed.) :(

You receive a prescription that reads: Restoril® 15mg PRN HS #30. What instructions will likely appear on the customers packaging ?
Answer is Take 1 capsule at bedtime as needed.
(I thought that it was 1 tablespoon at bedtime as needed.) :(

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