How to Read a Prescription (and the Stock Label Next to It)
By the RxReflex Content Team · Last reviewed August 6, 2026
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Every prescription has the same skeleton: the inscription (drug and strength), the sig (directions), the subscription (quantity to dispense), the refills, and a DAW code saying whether a substitution is allowed. Order entry is the process of moving those five fields into the system correctly — and it is 22.5% of the 2026 PTCE.
The five parts of a prescription
Part
What it holds
Example
Inscription
The drug name, strength, and dosage form
Lisinopril 10 mg tablet
Sig
The directions — becomes the patient label
1 tab PO daily
Subscription
The quantity to dispense
#30
Refills
How many times it can be refilled
Refills: 5
DAW code
Whether a generic substitution is allowed
DAW 0
Around those five you'll also find the prescriber's information (including a DEA number if it's a controlled substance), the patient's name and date of birth, and the date written. Any of those can be the thing that's wrong in an exam question.
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The question pattern
Order-entry questions are usually shaped as "what should the technician do FIRST?" The answer is almost never "dispense." It is verify, clarify, or escalate to the pharmacist — because a technician cannot make a clinical judgment call.
DAW codes 0 through 9
DAW stands for Dispense As Written. The code records why a brand or generic was dispensed, which is what the insurer prices against. Choosing the wrong one is a billing problem, not just a paperwork one.
Code
Meaning
DAW 0
No product selection indicated — substitution allowed. The most common code by far.
DAW 1
Prescriber says brand is medically necessary — no substitution
DAW 2
Patient requested the brand
DAW 3
Pharmacist selected the brand
DAW 4
Generic out of stock
DAW 5
Brand dispensed, priced as a generic
DAW 6
Override (for example, a prior authorization)
DAW 7
Brand mandated by law
DAW 8
Generic not available (manufacturer shortage)
DAW 9
Plan or insurer requested the brand
The two the exam leans on are DAW 0 and DAW 1. DAW 0 is the default and should be on the large majority of claims. DAW 1 requires the prescriber to have said brand is medically necessary — a patient asking for the brand is DAW 2, and coding that as DAW 1 misrepresents the claim.
The NDC number on the stock label
The National Drug Code identifies exactly what is in the bottle. It is 10 digits in three segments:
Segment
What it identifies
Labeler
The manufacturer or distributor — assigned by the FDA
Product
The specific drug, strength, and dosage form
Package
The package size and type
The FDA assigns segment lengths in one of three formats — 4-4-2, 5-3-2, or 5-4-1. For billing, the code is padded with a leading zero in the appropriate segment to a uniform 11 digits (5-4-2). That padding step is a common exam question, and a common real-world rejection.
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Why the middle segment matters
The product segment is where strength lives. Two bottles of the same drug at different strengths share a labeler code and differ in the product segment — which is exactly why "same drug, wrong strength" errors are caught by scanning, not by reading the front of the bottle.
Lot number, expiration, and the rest of the label
Field
What it's for
Lot number
The batch ID. This is what a recall is issued against — it tells you whether your stock is affected.
Expiration date
"EXP 06/2027" with no day means good through the last day of that month.
Manufacturer
Who made it — matters for substitution and recall notices
Storage
Room temperature, refrigerated, protect from light
Bar code
The scan that verifies the NDC at the point of fill
The expiration convention is worth memorizing precisely because it is counter-intuitive: a product marked EXP 06/2027 is usable through June 30, 2027, not June 1.
The order-entry workflow, in the order a technician does it
arrow_rightVerify the patient — name plus date of birth, not name alone. Two patients share a name more often than you'd think.
arrow_rightRead the inscription — drug, strength, form. Confirm all three, not just the name.
arrow_rightTranslate the sig — see the sig codes cheat sheet. Read the route before the frequency.
arrow_rightEnter quantity and refills — and check them against the drug's schedule if it's a controlled substance.
arrow_rightSelect the DAW code — DAW 0 unless something specific says otherwise.
arrow_rightScan the stock bottle — the NDC check is what catches a wrong-strength pull.
arrow_rightFlag anything ambiguous to the pharmacist — illegible directions, a missing DEA number on a controlled Rx, an early refill, a dose that looks off.
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Scope of practice
A technician may not clarify a clinical question with the prescriber on their own judgment, and may not decide a dose is fine. "Ask the pharmacist" is a real answer on this exam, not a cop-out.
Reading a prescription — FAQ
What are the parts of a prescription?
The inscription (drug, strength, form), the sig (directions), the subscription (quantity to dispense), the refills, and the DAW code. Prescriber and patient identifiers sit around them, including a DEA number on controlled-substance prescriptions.
What is the most common DAW code?
DAW 0 — no product selection indicated, meaning substitution is allowed. It belongs on the large majority of claims. DAW 1 is reserved for when the prescriber has specified that the brand is medically necessary.
What is the difference between DAW 1 and DAW 2?
DAW 1 is the prescriber requiring the brand. DAW 2 is the patient requesting it. They are billed differently, so using DAW 1 for a patient preference misrepresents the claim.
How many digits is an NDC number?
Ten digits in three segments (labeler, product, package), assigned as 4-4-2, 5-3-2, or 5-4-1. For billing it is padded with a leading zero to a uniform 11 digits in 5-4-2 format.
If a bottle says EXP 06/2027, when does it expire?
It is good through the last day of that month — June 30, 2027. An expiration with no day always means the end of the stated month.
What is a lot number used for?
It identifies the manufacturing batch. When a recall is issued it names specific lot numbers, so the lot is how you determine whether the stock on your shelf is affected.
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Practice order entry the way the exam asks it
RxReflex drills Order Entry & Processing as scenario questions — DAW selection, NDC checks, label reads — each with a rationale for every answer option. Premium unlocks the full scenario bank and the DAW-code and stock-label cheat sheets. Free to start on iOS and Android.
Prefer a printable version? Grab “The PTCB Pass Code” free PDF — the highest-yield facts, formulas & traps on 22 pages.
Last reviewed August 6, 2026 by the RxReflex Content Team. Educational use only — not medical advice. Exam
policies and fees are set by PTCB — always confirm details at
ptcb.org.
Verify clinical specifics with your pharmacist or a current label source such as
DailyMed.
RxReflex is not affiliated with or endorsed by the Pharmacy Technician Certification Board (PTCB).