REFERENCE FORMULA
Reference formula
Reference basis: 1000 g (source formula)
| Ingredient | Source quantity | Scaled quantity |
|---|---|---|
| Cetrimide | 5 g | — |
| Cetostearyl alcohol | 50 g | — |
| Liquid paraffin | 500 g | — |
| Freshly boiled and cooled purified water | q.s. ad 1000 g | — |
REFERENCE FORMULA SCALING
Proportional quantities of the same formula
Arithmetic aid. It does not change strength, dose, method or BUD and does not authorise compounding.
Theoretical calculation sheet
CGR-BP-011 · Cetrimide Cream 0.5% w/w
Not an approved master record or batch release. BUD is not calculated.
| Ingredient | Reference | Calculated | Lot | Actual quantity |
|---|
Prerequisite formulations
No separate prerequisite monograph is listed.
Documentation
Preparation description
Cetrimide 0.5% w/w cream in an emulsified liquid-paraffin/water base. The source specifies no particular colour. [1]
Specifications
Cetrimide: 88.0-106.0% of label claim [1]
Light
Finished-product photostability is not specified. Any required container light protection is stated under Storage. [1]
Air and oxidation
No oxidative stability study of the finished mixture or inert-atmosphere requirement is provided. Use the source container. [1]
Water and solubility
Liquid Paraffin: JP classifies the corresponding pure raw material as practically insoluble in water. [4]
Humidity
No numerical relative-humidity limit is given for the finished product. Prevent raw-material wetting and condensation entering the container. [1]
Temperature
No permitted temperature excursion or freeze–thaw cycle is established. Processing and storage temperatures are stated in their respective fields. [1]
pH and compatibility
No finished-product pH range is specified. Do not add a pH adjuster without a supported formula change. [1]
Other interactions
Cetrimide: incompatible with soaps, anionic surfactants, bentonite, iodine and alkali hydroxides. [3]
Ingredient-specific information
Staff protection
Risk assessment
Reference batch: 1000 g (source formula). First ingredient: Cetrimide, 5 g. Independently check chemical form, units and every scale conversion before weighing.
Check addition order, phase-temperature difference and uniformity after cooling. Phase separation can alter local strength and preservative partitioning; do not repair it arbitrarily with water or emulsifier.
For the local assessment record quantity per preparation, work frequency, duration of open handling, potential exposure routes and effectiveness of controls. These are assessment inputs; no fictitious final risk score is assigned.
For this procedure’s heating stage, check thermometer, heating method, duration and prevention of overheating/solvent loss. Completion of mixing does not establish cooling or complete homogenisation.
Release checkpoint: inspect aggregates, crystals, local texture differences and free liquid after completing the method. Record mixing geometry, batch size and actual temperatures; copying rpm to another mixer does not establish process equivalence.
Contains cetostearyl or cetyl alcohol, which can cause local skin reactions; include components of the selected base in the assessment. [1], [8], [10], [12]
Check addition order, phase-temperature difference and uniformity after cooling. Phase separation can alter local strength and preservative partitioning; do not repair it arbitrarily with water or emulsifier.
For the local assessment record quantity per preparation, work frequency, duration of open handling, potential exposure routes and effectiveness of controls. These are assessment inputs; no fictitious final risk score is assigned.
For this procedure’s heating stage, check thermometer, heating method, duration and prevention of overheating/solvent loss. Completion of mixing does not establish cooling or complete homogenisation.
Release checkpoint: inspect aggregates, crystals, local texture differences and free liquid after completing the method. Record mixing geometry, batch size and actual temperatures; copying rpm to another mixer does not establish process equivalence.
Contains cetostearyl or cetyl alcohol, which can cause local skin reactions; include components of the selected base in the assessment. [1], [8], [10], [12]
Compounding conditions
BUD rationale
No specific experimental period was located covering the complete exact formulation, container and microbiological suitability.
Aqueous cream containing 0.5% cetrimide. Antiseptic activity of the ingredient does not establish preservation in the final emulsion. Conservatively treat final preservation as unestablished.
Selected conservative general rule: up to 14 days at 2–8 °C for an aqueous form without adequately established preservation. Refrigeration must not cause precipitation, irreversible separation or other loss of suitability. If that condition fails, do not apply 14 days at room temperature; obtain specific short-use evidence.
Use-by date = the earliest allowed date from preparation plus selected period, ingredient expiries and any shorter supported limit. In-use dating never extends overall BUD. Complete the actual date for the batch after the required checks.
A default is a conservative dating limit, not experimental proof of batch stability. Its category depends on final composition, preservation and permitted temperatures. Water percentage or loss on drying does not determine aw. Document using SOP-014/F-006; use SOP-017/F-012 for specific aw evidence.
USP clarification: aw measurement is not required for every nonsterile preparation. Category assignment may use the exact composition and relevant representative examples; an uncertain or borderline formulation is best assessed by a suitable specific measurement. This edition contains no measured aw or released batch. The final preparation generally must not outlast the remaining BUD of its compounded bases/intermediates. An exception requires specific justification that physical, chemical and microbiological quality is not adversely affected. Record the final limit, intermediate preparation dates and their actual expiry dates separately. [1], [7], [9], [11]
Aqueous cream containing 0.5% cetrimide. Antiseptic activity of the ingredient does not establish preservation in the final emulsion. Conservatively treat final preservation as unestablished.
Selected conservative general rule: up to 14 days at 2–8 °C for an aqueous form without adequately established preservation. Refrigeration must not cause precipitation, irreversible separation or other loss of suitability. If that condition fails, do not apply 14 days at room temperature; obtain specific short-use evidence.
Use-by date = the earliest allowed date from preparation plus selected period, ingredient expiries and any shorter supported limit. In-use dating never extends overall BUD. Complete the actual date for the batch after the required checks.
A default is a conservative dating limit, not experimental proof of batch stability. Its category depends on final composition, preservation and permitted temperatures. Water percentage or loss on drying does not determine aw. Document using SOP-014/F-006; use SOP-017/F-012 for specific aw evidence.
USP clarification: aw measurement is not required for every nonsterile preparation. Category assignment may use the exact composition and relevant representative examples; an uncertain or borderline formulation is best assessed by a suitable specific measurement. This edition contains no measured aw or released batch. The final preparation generally must not outlast the remaining BUD of its compounded bases/intermediates. An exception requires specific justification that physical, chemical and microbiological quality is not adversely affected. Record the final limit, intermediate preparation dates and their actual expiry dates separately. [1], [7], [9], [11]
Prerequisites
No separately registered base is required. Any commercial vehicle remains the exact named product in the formula table. [1]
Equipment
Balance with suitable minimum weight, mortar/pestle or homogeniser, mixing vessels, spatulas, thermometer for heated processes and volumetric equipment for mL quantities. [1]
Compounding method
1. Melt cetostearyl alcohol with liquid paraffin and maintain at about 60 °C.
2. Dissolve cetrimide in sufficient freshly boiled and cooled purified water to produce about 450 g solution; bring the aqueous phase to about 60 °C.
3. Mix the phases with stirring to emulsify. Continue stirring while cooling; adjust to a final 1000 g with the specified water. [1]
2. Dissolve cetrimide in sufficient freshly boiled and cooled purified water to produce about 450 g solution; bring the aqueous phase to about 60 °C.
3. Mix the phases with stirring to emulsify. Continue stirring while cooling; adjust to a final 1000 g with the specified water. [1]
Observations
5 g cetrimide in a final 1000 g equals 0.5% w/w. This monograph applies exclusively to that strength. [1]
Container and packaging
Selection for local assessment: tight semisolid tube or jar with a suitable lining. Check cleanliness, integrity, closure and material compatibility before filling. The specific monograph does not validate a particular commercial container. [1]
Quality control
After dispersing a portion containing 5 mg cetrimide in 10 mL hot water, add sulfuric acid/chloroform and dimethyl-yellow indicator. Titrate with 0.001 M sodium dioctyl sulfosuccinate; 1 mL equals 0.3364 mg C17H38BrN.
Record the method, acceptance criterion, actual result and reviewer separately in F-005. A critical specification failure requires quarantine and investigation under SOP-015; retesting needs justification. [1], [10]
Record the method, acceptance criterion, actual result and reviewer separately in F-005. A critical specification failure requires quarantine and investigation under SOP-015; retesting needs justification. [1], [10]
Storage
Dispensing
Labelling
Cetrimide Cream 0.5% w/w
External use
Quantity: ____ Batch: ____
Prepared: ____ Use by: ____
Patient / dose / frequency: ____
Storage: 2–8 °C, after confirming suitability for refrigeration.
Temperature for this batch BUD: ____
Contains cetostearyl or cetyl alcohol, which can cause local skin reactions; include components of the selected base in the assessment. [1], [6], [7], [12]
External use
Quantity: ____ Batch: ____
Prepared: ____ Use by: ____
Patient / dose / frequency: ____
Storage: 2–8 °C, after confirming suitability for refrigeration.
Temperature for this batch BUD: ____
Contains cetostearyl or cetyl alcohol, which can cause local skin reactions; include components of the selected base in the assessment. [1], [6], [7], [12]
v9_controls
The numeric value is a literature reference ceiling subject to its specific conditions. No actual batch BUD has been assigned and no aw measurements have been produced. The exact formula, prerequisites, container, storage and quality evidence require approval for the actual application. The BUD clock starts when compounding begins. Use the shortest applicable supported limit and assess in-use dating separately. USP categories are a technical framework and are not presented as Greek legislation.
Independent Greek/English adaptation and organisation of facts from the cited source. This is not an official translation or publisher endorsement.
Sources and references
- British Pharmacopoeia 2016 — Cetrimide Cream2016PDF pp. 1–1; user-supplied BP extract; URL is publisher catalogue, not the licensed full monographmaster formula2026-09-10
- PN/L/PG/002/00 INDUMENTARIAΔιαθέσιμο κείμενο / Retrieved textPDF pp. 1–5general staff protection2026-09-10
- Thornton & Ross — Care Antiseptic First Aid Cream, SmPC10 April 2026Sections 2, 5.1 and 6.2; PL 00240/6277Ringredient incompatibilities; not compounded stability2026-09-12
- MHLW — Japanese Pharmacopoeia XVIII: Liquid ParaffinJP XVIII, 2021; English textPrinted p. 1477; Description; Containers and storageraw-material monograph2026-09-12
- ASHP — USP <795> Key Changes2023pp. 1–3: scope, water activity and staff precautionsprofessional guidance; not the licensed USP chapter2026-09-12
- Texas State Board of Pharmacy — adopted 22 TAC §291.131, nonsterile compoundingTexas Register, 7 June 2024Beyond-use dating: aw categories, 14/35/90/180 days, limits and extensionspublic regulatory implementation of USP <795> BUD framework; not Greek law2026-09-12
- Illinois IDFPR — Nonsterile Compounding Self-Inspection ReportPublic checklist, retrieved 12 September 2026pp. 15–16, Establishing beyond-use datesPublic regulatory implementation of USP <795>; not Greek law; general limits and requirements for extension2026-09-12
- NIOSH — Managing Hazardous Drug Exposures: Information for Healthcare Settings2023; DHHS (NIOSH) 2023-130Risk assessment; printed pp. 27–33, activity/formulation control tableWorkplace exposure, hierarchy of controls and activity-specific PPE; US government public-domain document2026-09-12
- USP — Compounding Standards and Beyond-Use Dates, 2022 updateNovember 2022, published by USP; public copy hosted by Mississippi Boardpp. 1–2; nonsterile tableRisk-based default categories; not product-specific stability or Greek law2026-09-12
- PIC/S — Guide to Good Practices for the Preparation of Medicinal Products in Healthcare EstablishmentsPE 010-4, 1 March 2014Chapters 1–9; Annex 2 (nonsterile liquids, creams, ointments)Professional quality-system framework; not automatic national legal adoption or certification2026-09-12
- USP — General Chapter <795> FAQsUpdated 1 November 2023Questions 52, 54–56, 60–62; PDF pp. 11–14Primary clarification of aw classification, extension prerequisites and compounded-component BUDs; not automatic Greek legal adoption2026-10-14
- EMA — Excipients in the labelling and package leaflet, Annex Revision 5Published 5 December 2025EN and EL worksheets: arachis oil, wool fat, cetostearyl/cetyl alcohol, chlorocresolCurrent primary excipient warnings; used as a scientific labelling reference, without claiming MAH obligations automatically apply to a compounded prescription2026-10-14