Community Pharmacy · Short notes

Prescription Handling and Dispensing: Short Notes & Cheat Sheet

Parts of a prescription, Latin abbreviations, safe writing of doses, the dispensing process, labelling and paediatric dose rules.

Attempt Prescription Handling and Dispensing MCQs

Short notes

Read these before you attempt the topic's MCQs.

Dispensing a prescription

Clinical screening before selection and an independent final check catch most dispensing errors.

The prescription

A valid prescription shows the prescriber's name, qualification and registration number (PMDC in Pakistan), the date, the patient's name and age (weight for children), and the prescriber's signature.
Superscription: the Rx symbol ('recipe', take thou).
Inscription: the drug name, strength and quantity.
Subscription: instructions to the pharmacist (e.g. dispense 10 tablets).
Signatura (Sig): directions to the patient, which go on the label.

Dispensing step by step

Receive and check the prescription is legal, complete and authentic.
Screen it clinically: dose, duplication, interactions, allergies, contraindications, pregnancy and kidney function.
Select the right product, checking name, strength, dosage form and expiry. Count or measure accurately.
Label with the patient's name, drug, strength, directions, quantity, date, pharmacy name and address, and any warnings.
A final independent check comes before handing over with counselling, then the transaction is recorded.

Writing doses safely

Always use a leading zero (0.5 mg), never a trailing zero (write 1 mg, not 1.0 mg), to avoid tenfold errors.
Write 'units' in full; 'U' has been misread as 0 or 4.
Write 'daily' rather than 'QD', which can be misread as 'QID'.
Paediatric dose rules: Young's (age ÷ (age + 12) × adult dose, ages 1–12), Clark's (weight in lb ÷ 150 × adult dose) and Fried's (age in months ÷ 150 × adult dose, infants).
Body surface area (BSA ÷ 1.73 m² × adult dose) is the most accurate method.

Cheat sheet

High-yield facts in one place. Cover the right-hand column and test yourself.

Latin abbreviations

Abbreviation	Meaning
od	Once daily
bd / bid	Twice daily
tds / tid	Three times daily
qds / qid	Four times daily
ac / pc	Before / after meals
hs	At bedtime
stat	Immediately
prn / sos	When required
po	By mouth
q4h	Every 4 hours
qs	Sufficient quantity
gtt / ung	Drops / ointment

Paediatric dose rules

Rule	Formula
Young's	Age ÷ (age + 12) × adult dose
Clark's	Weight (lb) ÷ 150 × adult dose
Fried's	Age (months) ÷ 150 × adult dose
BSA	BSA (m²) ÷ 1.73 × adult dose

Memory aids

Lead with zero, never trail: Write 0.5 mg, not .5 mg; write 5 mg, not 5.0 mg.

Exam traps

The subscription is the instruction to the pharmacist; the signatura is the instruction to the patient.
Clark's rule uses weight in pounds, not kilograms.
Fried's rule is for infants and uses age in months.
BSA-based dosing is the most accurate paediatric method.

Revised? Now test yourself.

Attempt the Prescription Handling and Dispensing MCQs while the notes are fresh. Anything you get wrong is saved to your incorrect list for the next revision round.