15.3 Patient-Specific Preparations

14.3 Patient-Specific Preparations

Quick Answer: Translate formulation principles into patient cases. Distinguish manufacturer reconstitution of antibiotic powders from true compounding. Handle dermatological dilutions and high-risk hormone creams with clear strengths, containment, and counselling. Use flavouring thoughtfully for adherence. Teach use, storage, BUD, and measuring devices. Refuse requests that are unsafe, unnecessary, or outside competence—and document a safer plan. Use APF for methods and professional expectations under open-book exam conditions.

This section is application-focused. Intern Written items often present a parent, a dermatology prescription, or an unusual cream request and ask what you would do next.

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Case pattern A: Paediatric antibiotic suspension — reconstitution vs true compound

Proprietary powder for reconstitution

Many antibiotics are supplied as a dry powder for oral suspension. The pharmacist (or supervised intern) adds a specified volume of water, shakes, and labels with the manufacturer’s in-use expiry and storage (often refrigerate; some are room temperature—check the product).

Critical steps:

1. Confirm the product matches the prescription (drug, strength after reconstitution)
2. Use the correct total volume of diluent as per product information (not “about half a bottle of water”)
3. Invert/shake as directed to disperse fully; inspect for lumps
4. Label with patient directions, discard date, storage, and “shake well” if required
5. Counsel on dose volume with an oral syringe, course length, food requirements, and missed doses
6. Do not reconstitute far in advance of supply unless stock-control procedures justify it and stability allows

This is not designing a novel APF formula, but it is a high-frequency, high-error patient-specific preparation step. Wrong diluent volume → wrong strength → under- or overdosing.

True compound when no commercial liquid exists

If only tablets or capsules are marketed, a compounded oral liquid may be required. Then:

• Confirm no suitable licensed liquid exists
• Use an APF or evidence-based formula where available
• Choose vehicle and preservative appropriately for age
• Calculate concentration so doses are measurable (for example aim for whole-mL or easy 0.5 mL increments when possible)
• Assign BUD and storage from APF/stability principles
• Document the batch record fully
• Counsel carers that this is a compounded medicine with a shorter dating period than many factory liquids

Exam distinction: reconstituting a registered powder kit ≠ inventing a suspension from crushed tablets. The clinical checks differ, but both demand accurate strength and clear dating.

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Case pattern B: Dermatological dilutions

Example scenario

A prescriber orders a potent corticosteroid cream diluted to a lower percentage in a moisturising base for facial use in a teenager with sensitive skin.

Intern checklist:

Dilution is not always pharmacologically “linear” in clinical effect perception, but accurate preparation and labelling of the intended strength remain mandatory. Do not produce ambiguous labels such as “half strength cream” without stating the actual concentration.

Combination topicals

Combining antiseptics, steroids, and antifungals is sometimes requested. Assess evidence, compatibility, and whether separate commercial products applied in a planned sequence are safer. Unstable mixtures should be declined or reformulated with advice to the prescriber.

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Case pattern C: Hormone and other high-risk creams (high-level cautions)

Hormone creams (for example oestrogen or testosterone preparations in compounded form), other potent actives, and sensitising agents require elevated controls:

• Accurate dosing and strength — small absolute errors can be clinically significant
• Containment and cross-contamination control during preparation
• Patient counselling on transfer risk (skin-to-skin contact with partners or children for some hormones)
• Application site and hand washing
• Systemic adverse effect awareness and review triggers
• Questioning unnecessary custom hormone combinations marketed without clear evidence

Interns should treat “bioidentical multi-hormone cream” requests with professional scepticism: verify the prescription, clinical indication, monitoring plan, and whether a registered product exists. Complex hormone compounding may be complex compounding best referred to specialist facilities.

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Flavouring and adherence

Taste is a major reason children refuse medicines. Flavouring can help, but only within quality limits.

Good practice:

• Use flavour systems compatible with the vehicle and drug (APF/practice guidance)
• Avoid allergens relevant to the patient (e.g. specific food flavour proteins if pertinent)
• Do not add arbitrary kitchen ingredients that destroy stability or introduce microbes
• Re-check that flavouring volume does not meaningfully dilute strength unless the formula accounts for it
• Pair flavouring with correct measuring devices and demonstration

Adherence counselling beats endless reformulation: same time each day, reward routines, mask taste with compatible foods only if the drug allows (some antibiotics interact with dairy or require empty stomach—check AMH/product information).

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Counselling on use and storage of compounded medicines

Every compounded supply needs counselling that is more explicit than many proprietary packs.

Core counselling points

1. What it is — medicine name, strength, that it was compounded for them
2. How much and how often — demonstrate oral syringe or spatula technique
3. How long — course length or review date; do not keep “for next time” beyond BUD
4. Storage — fridge vs room temperature, protect from light/heat, keep out of children’s reach
5. BUD / discard date — exact date; what to do with leftovers (return to pharmacy where appropriate)
6. Appearance changes — separation that does not resuspend, colour change, odd smell → do not use; contact pharmacy
7. Missed doses and side effects — standard clinical counselling plus when to seek care
8. Other medicines and allergies — confirm again at supply

Document counselling for high-risk preparations. Offer written instructions when literacy, language, or complexity warrants—plain English or interpreter support as needed (link to culturally responsive care from Standard 3.1).

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When to refuse unsafe compound requests

Pharmacists may and must decline compounding that cannot be done safely or ethically.

Refuse or redesign when

Communication tips: explain the patient-safety reason, offer alternatives (different form, commercial option, specialist compounder, prescriber discussion), and document the decision. Refusal is a professional act under Standards 1.3 and 3.4, not rudeness.

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Integrated mini-cases for exam thinking

Mini-case 1: Parent asks you to crush several adult warfarin tablets into a weekly syrup stored in a soft drink bottle. → Refuse that process: anticoagulant potency risk, stability/microbial risk, unsafe container, better to use measurable strengths with clear labelling and device education—or liaise for an appropriate formulary liquid if justified.

Mini-case 2: Prescription for clotrimazole/hydrocortisone combination cream when a registered combination exists. → Prefer proprietary product unless an excipient issue forces compounding.

Mini-case 3: Oncology oral liquid from hazardous crushed tablets in a community dispensary without closed-system protection. → Treat as complex/hazardous; refer to appropriate service; protect staff and carers.

Mini-case 4: Antibiotic powder reconstituted yesterday, left at wrong temperature overnight, parent asks if it is “still OK because it looks fine”. → Do not rely on appearance; follow product-specific stability; often replace and recounsel storage.

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APF under open-book pressure for patient-specific work

When a case involves how to prepare or label a compound:

1. Identify preparation type in APF
2. Note method critical steps (order of mixing, warnings)
3. Apply BUD/storage guidance concepts
4. Cross-check clinical dose in AMH
5. Choose counselling and refusal points that match quality standards

Putting it together for the exam

Patient-specific compounding questions reward risk discrimination. Show you can reconstitute proprietary antibiotic powders correctly, dilute dermatologicals with transparent strengths, handle hormone/high-risk topicals cautiously, flavour only within quality limits, counsel on BUD and storage, and say no when requests are unsafe—while still solving the patient’s therapeutic need through alternatives.