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Welcome back to the RelayEd Pharmacy Tech Toolkit, a practical study newsletter designed to help pharmacy technicians and technician students build confidence one skill at a time.

Each issue breaks down a pharmacy concept you may see on the PTCE or encounter in practice, with clear explanations, worked examples, and quick practice to help reinforce what you learn.

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Today’s Theme: Quantity to Dispense

A prescription tells you more than what medication a patient should receive.

It also provides the information needed to determine what quantity of medication is needed to complete the prescribed therapy.

A simple way to think about it is:

Amount per dose × doses per day × number of days = quantity to dispense

Before calculating, identify three things:

• What quantity is used for each dose?
• How often is the medication taken?
• How long will the patient take the medication?

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Calculation Corner: Quantity to Dispense

Example 1: Capsules

A prescription reads:

Cephalexin 500 mg capsules

Take 1 capsule by mouth four times daily for 7 days.

How many capsules are needed?

Step 1: Identify the amount per dose

1 capsule per dose

Step 2: Identify the number of doses per day

Four times daily = 4 doses per day

Step 3: Identify the duration

7 days

Step 4: Calculate

1 capsule/dose x 4 doses/day x 7 days

= 28 capsules

Answer = Dispense 28 capsules

Example 2: Oral Liquid

A prescription reads:

Amoxicillin 400 mg/5 mL oral suspension

Take 7.5 mL PO Q12H for 10 days.

How many milliliters are needed to complete therapy?

Step 1: Identify the amount per dose

7.5 mL

Step 2: Identify the number of doses per day

Q12H = every 12 hours = 2 doses per day

Step 3: Identify the duration

10 days

Step 4: Calculate

7.5 mL/dose x 2 doses/day x 10 days

= 150 mL

Answer = Dispense 150 mL

Try It Yourself

A prescription reads:

Clindamycin 300 mg capsules.

Take 1 capsule PO TID x 7 days.

How many capsules should be dispensed?

Try it before looking below.

Answer

Step 1: Identify the amount per dose

1 capsule

Step 2: Identify the number of doses per day

TID = three doses a day

Step 3: Identify the duration

7 days

Step 4: Calculate

1capsules/dose × 3 doses/day × 7 days

= 21 capsules

Answer:

Dispense 21 capsules

What if the Directions Change?

Not every prescription uses the same amount throughout therapy.

Consider:

Prednisone 10 mg tablets

Take 3 tablets daily for 3 days, then 2 tablets daily for 3 days, then 1 tablet daily for 3 days.

Calculate each part separately.

First 3 days:

3 tablets/day × 3 days = 9 tablets

Next 3 days:

2 tablets/day × 3 days = 6 tablets

Final 3 days:

1 tablet/day × 3 days = 3 tablets

Now add them:

9 + 6 + 3 = 18 tablets

Answer

Dispense 18 tablets.

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Common Mistakes

Watch for these:

• Forgetting to multiply by the number of doses taken each day
• Confusing the amount per dose with the amount per day
• Missing the duration of therapy
• Misinterpreting BID, TID, or QID
• Forgetting to calculate each portion of a taper separately
• Using the drug strength when the question asks for the number of tablets, capsules, or milliliters
• Entering the calculated amount when the product is only supplied in fixed package sizes

Quick Check

Before finalizing your answer, ask:

Does this quantity provide enough medication for every prescribed dose for the full duration of therapy?

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Top 200 Connections: Lisinopril

Generic: Lisinopril
​Brand: Zestril, Prinivil
​Class: ACE inhibitor
​Primary uses: Hypertension and certain cardiovascular conditions

Common strengths: 2.5 mg, 5 mg, 10 mg, 20 mg, 40 mg
​Common dosage form: Tablets

What should you know?

Lisinopril lowers blood pressure by inhibiting angiotensin-converting enzyme. Most ACE inhibitors share the -pril ending (enalapril, ramipril, benazepril, quinapril) which is a fast way to recognize the class on an exam or a medication label.

Safety Check

• Pregnancy: ACE inhibitors carry a boxed warning for fetal toxicity and are discontinued as soon as pregnancy is detected. Route to the pharmacist.
• Angioedema: swelling of the face, lips, tongue, or throat requires immediate medical attention.
• Dry cough: a persistent dry cough is a recognized adverse effect and a common reason therapy is switched.
• Dizziness: most likely when starting therapy or after a dose increase.
• Monitoring: blood pressure, potassium, and kidney function are followed during therapy.

One-Minute Knowledge Check

1.A prescription reads: Take 1 tablet PO BID x 14 days. How many tablets are needed?

A. 14 tablets
B. 28 tablets
C. 30 tablets
D. 56 tablets

2. A prescription reads: Take 5 mL TID x 7 days. How many milliliters are needed?

A. 35 mL
B. 70 mL
C. 105 mL
D. 210 mL

3.A prescription reads: Take 2 tablets daily for 4 days, then 1 tablet daily for 4 days. How many tablets are needed?

A. 8 tablets
B. 10 tablets
C. 12 tablets
D. 16 tablets

Answers below.

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Liz Fredrickson, PharmD, BCPS Founder, RelayEd liz@relayedllc.com

Always verify medication information using current product labeling, course materials, and workplace policies.

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