PTCB Quiz Prep

Drug Storage and Expiration Practice Questions

Updated · aligned to the 2026 PTCE outline

USP temperature ranges, cold chain handling, and the difference between an expiration date and a beyond-use date.

17 questionsAnswers includedUntimedEvery answer cited100% free

Key takeaways

  • USP controlled room temperature is 20 to 25 degrees C (68 to 77 F).
  • Refrigerated is 2 to 8 degrees C (36 to 46 F). Frozen is -25 to -10 degrees C.
  • An expiration date comes from the manufacturer for an unopened product. A beyond-use date is assigned by the pharmacy once the product is opened, reconstituted or repackaged.
  • The beyond-use date is whichever comes first: the manufacturer expiration or the pharmacy-assigned limit.

Storage questions are among the most answerable on the exam because the numbers are fixed. USP defines the temperature ranges, and they do not change. What trips candidates is the beyond-use date, which is not the same thing as the manufacturer's expiration date.

This set combines the storage and expiration slices of the Medications bank so the two concepts are practiced together, which is how the exam presents them.

Want the same material as a timed, randomized run instead? Try the timed drug storage and stability test and the Medications domain guide.

All 17 storage & expiration questions and answers

Each answer is followed by an explanation and a link to the primary source it was checked against.

  1. 1. Where should unopened insulin vials be stored in the pharmacy to maintain potency until their expiration date?

    • A.In the freezer at 0°F or below
    • B.In a refrigerator at approximately 36°F to 46°F
    • C.At controlled room temperature of 68°F to 77°F
    • D.Anywhere the temperature stays below 90°F

    Answer: B. In a refrigerator at approximately 36°F to 46°F

    Manufacturers recommend storing insulin refrigerated at approximately 36°F to 46°F (2°C to 8°C); stored this way unopened products keep their potency until the labeled expiration date. Freezing is wrong because it destroys insulin, and room-temperature storage limits the product to about 28 days of use.

    Source: fda.gov

  2. 2. Under USP standards, "controlled room temperature" is defined as a thermostatically maintained range of:

    • A.15°C to 30°C (59°F to 86°F)
    • B.2°C to 8°C (36°F to 46°F)
    • C.20°C to 25°C (68°F to 77°F)
    • D.8°C to 15°C (46°F to 59°F)

    Answer: C. 20°C to 25°C (68°F to 77°F)

    USP defines controlled room temperature as the usual and customary working environment of 20°C to 25°C (68°F to 77°F). The 15°C to 30°C range describes allowable temporary excursions around that range, not the defined storage band itself.

    Source: usp.org

  3. 3. A medication label directs refrigerated storage. Per USP definitions, controlled cold (refrigerator) temperature is maintained between:

    • A.2°C and 8°C (36°F and 46°F)
    • B.-25°C and -10°C
    • C.8°C and 15°C
    • D.20°C and 25°C

    Answer: A. 2°C and 8°C (36°F and 46°F)

    USP defines controlled cold temperature as thermostatically maintained between 2°C and 8°C (36°F and 46°F), the standard pharmacy refrigerator range. The -25°C to -10°C range describes freezer storage, which would ruin most refrigerated products such as insulin and many vaccines.

    Source: usp.org

  4. 4. A product monograph directs storage in a "cool" place. According to USP definitions, which temperature range does this specify?

    • A.2°C to 8°C (36°F to 46°F)
    • B.20°C to 25°C (68°F to 77°F)
    • C.0°C to 8°C (32°F to 46°F)
    • D.8°C to 15°C (46°F to 59°F)

    Answer: D. 8°C to 15°C (46°F to 59°F)

    USP defines "cool" as any temperature between 8°C and 15°C (46°F and 59°F), sitting between refrigeration and room temperature. It is frequently confused with the 2°C to 8°C refrigerator range; USP notes an article directed to cool storage may alternatively be refrigerated unless the monograph says otherwise.

    Source: usp.org

  5. 5. A patient wants to move their sublingual nitroglycerin tablets into a weekly plastic pill organizer. What is the correct storage advice?

    • A.A pill organizer is fine as long as it stays dry
    • B.Keep the tablets in their original container, tightly closed, at room temperature away from heat and moisture
    • C.Transfer the tablets to the refrigerator to preserve potency
    • D.Store the tablets in the bathroom medicine cabinet for quick access

    Answer: B. Keep the tablets in their original container, tightly closed, at room temperature away from heat and moisture

    Sublingual nitroglycerin must stay in the container it came in, tightly closed after each use, at room temperature away from excess heat and moisture. A plastic organizer exposes the tablets to air and moisture that degrade the drug, and a bathroom cabinet is specifically discouraged because of humidity.

    Source: medlineplus.gov

  6. 6. How should promethazine suppositories be stored in the pharmacy?

    • A.In the refrigerator, protected from light
    • B.At controlled room temperature on the fast-mover shelf
    • C.In the freezer to keep them firm
    • D.In a warm area to make insertion easier

    Answer: A. In the refrigerator, protected from light

    Promethazine suppositories are stored in the refrigerator and protected from light. Room-temperature storage risks softening and degrading the suppository base, while freezing is unnecessary and not the labeled condition.

    Source: medlineplus.gov

  7. 7. What is the primary purpose of USP General Chapter <800>?

    • A.To set beyond-use dates for sterile compounds
    • B.To standardize NDC formatting across manufacturers
    • C.To set standards for safe handling of hazardous drugs that minimize exposure risk to healthcare personnel, patients, and the environment
    • D.To define temperature ranges for drug storage equipment

    Answer: C. To set standards for safe handling of hazardous drugs that minimize exposure risk to healthcare personnel, patients, and the environment

    USP <800> provides standards for safely handling hazardous drugs to minimize the risk of exposure to healthcare personnel, patients, and the environment. Beyond-use dating for sterile preparations is governed by USP <797>, which is the chapter most often confused with <800>.

    Source: usp.org

  8. 8. A caregiver asks how to get rid of a used fentanyl transdermal patch at home. Per FDA recommendations, what should they do?

    • A.Throw the used patch directly into the kitchen trash
    • B.Cut the patch into small pieces before discarding
    • C.Save used patches and return them only at an annual take-back event
    • D.Fold the patch in half with the sticky sides together and flush it down the toilet

    Answer: D. Fold the patch in half with the sticky sides together and flush it down the toilet

    The FDA recommends promptly folding used fentanyl patches in half with the sticky sides together and flushing them down the toilet, because a discarded patch still holds enough drug to kill a child who finds and handles it. Ordinary trash disposal is wrong here since children and pets can retrieve the patch.

    Source: fda.gov

  9. 9. A pregnant pharmacy technician is asked to clean up several finasteride tablets that were crushed in the counting machine. What is the correct course of action?

    • A.Wear a single glove and sweep the powder quickly
    • B.She should not handle the crushed tablets at all; another staff member should clean up
    • C.Rinse the tablets under water first to deactivate the drug
    • D.Handling is fine because oral absorption is the only exposure route

    Answer: B. She should not handle the crushed tablets at all; another staff member should clean up

    Women who are pregnant or may become pregnant should not touch crushed or broken finasteride tablets because the active ingredient can be absorbed through the skin and can cause genital abnormalities in a male fetus. The intact tablet coating normally prevents contact with the drug, but that protection is lost once tablets are crushed, so the skin-exposure risk is real.

    Source: dailymed.nlm.nih.gov

  10. 10. A wholesale order of latanoprost ophthalmic solution arrives at the pharmacy. Where should the unopened bottles be stored?

    • A.In the refrigerator at 2°C to 8°C (36°F to 46°F), protected from light
    • B.At room temperature on the ophthalmic shelf
    • C.In the freezer until dispensed
    • D.In a warm cabinet near the compounding area

    Answer: A. In the refrigerator at 2°C to 8°C (36°F to 46°F), protected from light

    Unopened latanoprost bottles are stored under refrigeration at 2°C to 8°C and protected from light. Room-temperature storage only becomes acceptable after a bottle is opened for use, at which point it may be kept at up to 25°C for 6 weeks.

    Source: dailymed.nlm.nih.gov

  11. 11. Under USP compounding standards, the beyond-use date (BUD) of a compounded preparation is calculated starting from what point in time?

    • A.The date or time the preparation is compounded
    • B.The earliest expiration date of the ingredients used
    • C.The date the preparation is dispensed to the patient
    • D.The date the patient takes the first dose

    Answer: A. The date or time the preparation is compounded

    BUDs are calculated from the date or time of compounding, marking when the preparation may no longer be stored or transported. The dispensing date is irrelevant to the calculation, which is why counting from pickup is the classic wrong answer.

    Source: usp.org

  12. 12. Per USP <795>, what is the maximum beyond-use date for a compounded nonsterile aqueous oral preparation that contains NO preservative?

    • A.35 days
    • B.14 days
    • C.90 days
    • D.180 days

    Answer: B. 14 days

    Nonpreserved aqueous preparations carry the shortest limit, 14 days, because water supports microbial growth and there is no preservative to suppress it. The 35-day limit applies only when the aqueous preparation contains a preservative.

    Source: usp.org

  13. 13. A pharmacist compounds an oral suspension that contains an added preservative. Under USP <795>, what is the longest beyond-use date that may be assigned?

    • A.14 days
    • B.90 days
    • C.180 days
    • D.35 days

    Answer: D. 35 days

    Preserved aqueous preparations may be assigned a BUD of up to 35 days under USP <795>. The 90-day and 180-day limits apply to nonaqueous and solid dosage forms respectively, not to a water-based suspension, and 14 days is the stricter limit reserved for nonpreserved aqueous preparations.

    Source: usp.org

  14. 14. A conventionally manufactured multiple-dose vial is first punctured on March 1. The manufacturer's labeling gives no in-use time limit. Per USP standards, when must the vial be discarded?

    • A.On the manufacturer's printed expiration date
    • B.14 days after the first puncture
    • C.28 days after the first puncture (March 29)
    • D.48 hours after the first puncture

    Answer: C. 28 days after the first puncture (March 29)

    USP <797> states a conventionally manufactured multiple-dose vial may not be used more than 28 days after first puncture unless the manufacturer specifies otherwise. Relying on the printed expiration date is wrong because that date only applies while the vial remains unpunctured.

    Source: pages.usp.org

  15. 15. According to the FDA, what does the expiration date printed on a manufactured drug product actually represent?

    • A.The date after which the drug becomes immediately toxic
    • B.The period during which the drug is known to remain stable, retaining its strength, quality, and purity under labeled storage conditions
    • C.The last date the pharmacy may legally purchase the product
    • D.A marketing date chosen by the wholesaler

    Answer: B. The period during which the drug is known to remain stable, retaining its strength, quality, and purity under labeled storage conditions

    Expiration dates reflect the time period during which the product is known to remain stable when stored as labeled, supported by stability testing submitted to the FDA. Drugs do not automatically become poisonous at expiration; the concern is loss of strength and possible degradation products, so the toxicity option overstates it.

    Source: fda.gov

  16. 16. A parent picks up a reconstituted amoxicillin oral suspension and asks how long it can be used. What should they be told?

    • A.Discard any unused portion after 7 days
    • B.It is good until the expiration date on the stock bottle
    • C.Discard any unused portion after 28 days
    • D.Discard any unused portion after 14 days

    Answer: D. Discard any unused portion after 14 days

    Once mixed with water, amoxicillin suspension should be discarded after 14 days. The stock bottle's expiration date no longer applies after reconstitution because the added water starts chemical degradation, which is why that distractor is wrong.

    Source: medlineplus.gov

  17. 17. An insulin vial has been opened and kept at room temperature between 59°F and 86°F. According to FDA guidance, after how many days should it no longer be used?

    • A.28 days
    • B.14 days
    • C.7 days
    • D.90 days

    Answer: A. 28 days

    FDA guidance states insulin vials and cartridges, opened or unopened, may be left unrefrigerated at 59°F to 86°F for up to 28 days and continue to work. The 14-day figure is a common mix-up with reconstituted antibiotic suspensions, not insulin.

    Source: fda.gov

Storage & Expiration: FAQ

What is USP controlled room temperature?

20 to 25 degrees C, or 68 to 77 degrees F, with permitted excursions between 15 and 30 degrees C. It is the default storage condition for most oral solid products.

What is the difference between an expiration date and a beyond-use date?

The expiration date is set by the manufacturer through stability testing and applies to the unopened product in its original container. The beyond-use date is set by the pharmacy after the product is opened, reconstituted, compounded or repackaged, and it is always on or before the manufacturer's expiration date.

What temperature range counts as refrigerated?

2 to 8 degrees C, or 36 to 46 degrees F. Vaccines, insulin and many reconstituted antibiotic suspensions require it, and excursions outside the range need to be documented and assessed.

Official sources checked

Every answer above was written against a primary source and verified independently. These are the 12 sources behind this set.

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