RBT Practice Test 3 | Free 10+ PTCB® Mock Exams 2025

Here’s another free PTCB practice exam. Make sure to complete as many questions as you can to strengthen your knowledge. Review each explanation carefully, especially for missed questions.

PTCB Practice Test 3

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Question 1

A prescription reads: “Ceftriaxone 1 g IV q24h × 7 days.” The vial contains 500 mg/2 mL. How many mL are needed per dose?

A
2 mL
B
4 mL
C
6 mL
D
8 mL
Question 1 Explanation: 
Dose required = 1 g = 1000 mg Concentration = 500 mg/2 mL → 1000 ÷ 500 = 2 × 2 mL = 4 mL
Question 2

A prescription states: “Prednisone 20 mg PO daily × 5 days, then 10 mg daily × 5 days.” Total number of tablets needed if 10 mg tablets are available?

A
25
B
20
C
15
D
10
Question 2 Explanation: 
First 5 days: 20 mg → 2 tablets/day × 5 = 10 Next 5 days: 10 mg → 1 tablet/day × 5 = 5 Total = 10 + 5 = 15 tablets
Question 3
Which DEA schedule allows prescriptions to be refilled up to 5 times within 6 months?
A
Schedule II
B
Schedule III
C
Schedule I
D
Schedule IV
Question 3 Explanation: 
Schedule III & IV drugs can be refilled up to 5 times within 6 months. Schedule II cannot be refilled; Schedule I has no medical use.
Question 4

Which scenario requires immediate pharmacist intervention?

A
Counting 20 tablets into a vial
B
Refilling OTC multivitamins
C
Updating inventory records
D
Patient prescribed hydroxyzine but has severe QT prolongation
Question 4 Explanation: 
Hydroxyzine can worsen QT prolongation. Any potential drug–patient contraindication requires pharmacist review before dispensing.
Question 5
A patient is prescribed 150 mg/day of a drug divided BID. Available: 50 mg tablets. How many tablets per dose?
A
1.5
B
1
C
2
D
3
Question 5 Explanation: 
Daily dose = 150 mg ÷ 2 = 75 mg per dose. Available tablets = 50 mg → 75 ÷ 50 = 1.5 tablets per dose.
Question 6

A pharmacy receives a prescription for “Omeprazole 40 mg PO daily × 30 days.” Patient requests a 90-day supply. Max supply allowed without new prescription under federal law?

A
30 days
B
60 days
C
90 days
D
180 days
Question 6 Explanation: 
Omeprazole is non-controlled, so pharmacies may dispense up to 90 days supply if allowed by prescriber. Controlled substances have stricter limits.
Question 7

A low-risk sterile preparation is compounded in a laminar airflow workbench without preservatives. If stored in a refrigerator, what is the maximum beyond-use date (BUD)?

A
30 hours
B
48 hours
C
24 hours
D
14 hours
Question 7 Explanation: 
According to USP <797>: Room temperature: 48 hours Refrigerated: 14 days Frozen: 45 days Thus, for a refrigerated low-risk CSP, the BUD is 14 days.
Question 8
Which of the following medications is classified as Schedule IV under the Controlled Substances Act?
A
Methylphenidate
B
Tramadol
C
Buprenorphine
D
Alprazolam
Question 8 Explanation: 
Schedule II: Methylphenidate Schedule IV: Alprazolam (benzodiazepine) Schedule IV (as of 2014): Tramadol Schedule III: Buprenorphine The question asks specifically for Schedule IV, making Alprazolam correct.
Question 9
How many milliliters of 70% isopropyl alcohol are needed to prepare 500 mL of 40% solution?
A
214 mL
B
286 mL
C
300 mL
D
500 mL
Question 9 Explanation: 
Using the allegation method: (C1)(V1) = (C2)(V2) (70)(V1) = (40)(500) V1 = 20,000 ÷ 70 = 285.7 mL ≈ 286 mL
Question 10
Which medication pair is most likely to cause a LASA error in the pharmacy?
A
Celexa and Celebrex
B
Metformin and Metoprolol
C
Amoxicillin and Ampicillin
D
Atorvastatin and Simvastatin
Question 10 Explanation: 
Celexa (citalopram) = SSRI antidepressant Celebrex (celecoxib) = NSAID They are unrelated but sound very similar, making errors dangerous. Other pairs are pharmacologically related or less confusing.
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