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Optimised Medical Supplies Ltd

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    1. Home
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    4. Dispensing Bottle Sizes: A UK Pharmacy Guide

    Buyer's Guides

    Dispensing Bottle Sizes: A UK Pharmacy Guide

    Choosing between 30ml and 1 litre is not just about volume. Neck size, closure compatibility and how much headspace you leave all change what you should reach for.

    OMS Clinical Team

    Product Specialists

    30 July 20263 min read

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    Most UK dispensing bottles come in 30ml, 60ml, 100ml, 125ml, 150ml, 200ml, 250ml, 300ml, 500ml and 1 litre. Pick the smallest size that holds the quantity with a little headspace. Over-sizing wastes money, takes shelf space and makes a part-filled bottle look short-measured to the patient.

    The sizes you will actually use

    In practice a community pharmacy turns over four or five sizes. Liquid antibiotics for children tend to land in 100ml and 200ml. Adult liquids sit at 200ml to 500ml. The 30ml and 60ml sizes are mostly ear, eye and nasal preparations, or specials made in small quantities. The 1 litre is a bulk container rather than something handed to a patient.

    Ordering the whole range in small quantities is a common mistake. You end up with dead stock in four sizes and run out of the two you use daily. Look at what you dispensed last quarter and weight your order to that.

    Headspace matters more than people expect

    A bottle filled to the brim cannot be shaken, and most liquid medicines need shaking before a dose. Leave roughly ten percent of the volume as headspace. That means a 150ml quantity is better in a 200ml bottle than squeezed into a 150ml one.

    Watch the neck, not just the volume

    Two bottles of the same capacity can take different closures. Check the neck finish, quoted as a number such as 28mm or GL18, before assuming a cap you already stock will fit.

    What BS1679 covers

    BS1679 is the British Standard for containers for pharmaceutical dispensing. It sets out requirements for the container itself, including dimensional tolerances and the light transmission properties that make amber glass suitable for light-sensitive preparations. When a supplier says a bottle is to BS1679, that is what they are claiming.

    It is worth knowing that the standard covers the container, not what you put in it. Suitability for a particular preparation is still your professional judgement.

    Glass or plastic

    • Amber glass for light-sensitive liquids, and where the preparation may interact with plastic
    • PET and polypropylene for general dispensing, where weight and breakage matter more
    • Glass where a preparation contains solvents that would attack plastic
    • Plastic for anything going to a care home or a patient with dexterity or mobility problems, simply because dropped glass is a real hazard

    Working out what to order

    Take your dispensing data for the last three months, group by the volume actually supplied, and round each group up to the next available bottle size. That gives you a weighting rather than a guess. Most pharmacies find two sizes account for well over half their usage, and ordering those in bulk while keeping small quantities of the rest is cheaper than an even spread.

    If you are ordering for a dispensing practice rather than a community pharmacy, the mix shifts. Practices tend to use fewer sizes and larger quantities of each.

    Common mistakes

    • Buying bottles and closures from different sources without checking the neck finish matches
    • Ordering an even spread across all ten sizes instead of weighting to actual usage
    • Filling to the brim, leaving no room to shake
    • Using clear glass or plastic for a light-sensitive preparation because it was what was to hand
    • Forgetting that a child-resistant closure changes the effective usable volume slightly

    None of these are catastrophic on their own. Together they are why a lot of dispensaries carry more container stock than they need and still run short of the size they use most.

    Frequently asked questions

    What sizes do UK dispensing bottles come in?
    The standard range is 30ml, 60ml, 100ml, 125ml, 150ml, 200ml, 250ml, 300ml, 500ml and 1 litre. Most community pharmacies use four or five of these regularly, with 100ml and 200ml the highest volume sizes for liquid antibiotics.
    What is BS1679?
    BS1679 is the British Standard for containers for pharmaceutical dispensing. It sets requirements for the container, including dimensional tolerances and the light transmission properties that make amber glass suitable for light-sensitive preparations. It covers the container, not its contents.
    How much headspace should a dispensing bottle have?
    Leave roughly ten percent of the volume as headspace so the medicine can be shaken before a dose. A 150ml quantity is better supplied in a 200ml bottle than filled to the brim of a 150ml one.
    Should I use glass or plastic dispensing bottles?
    Use amber glass for light-sensitive liquids and preparations that may interact with plastic. Use PET or polypropylene for general dispensing where weight and breakage matter, and particularly for anything going to a care home or a patient with reduced dexterity.
    Will any closure fit any bottle?
    No. Two bottles of the same capacity can take different closures. Check the neck finish, quoted as a size such as 28mm or GL18, before assuming a cap you already stock will fit.
    All resources

    On this page

    • The sizes you will actually use
    • Headspace matters more than people expect
    • What BS1679 covers
    • Glass or plastic
    • Working out what to order
    • Common mistakes
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