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    1. Home
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    3. Buyer's Guides
    4. Tablet Containers and Pots: Sizing, Materials and Moisture

    Buyer's Guides

    Tablet Containers and Pots: Sizing, Materials and Moisture

    Containers are usually chosen by capacity alone. Moisture, headspace and how the patient will actually open it matter more.

    OMS Clinical Team

    Product Specialists

    22 July 20264 min read

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    Tablet containers are usually picked on capacity: how many will fit. That is the least important of the decisions. What determines whether the medicine is still good in three months is moisture, headspace and the closure, and those are chosen separately.

    Sizing by count is unreliable

    Container capacity is quoted in millilitres or in a nominal tablet count, and the count assumes a tablet size the manufacturer chose. A pot rated for 100 tablets holds 100 of something. Large coated tablets or capsules will fill it at half that, and small uncoated tablets will rattle around in a third of the space.

    Work from the volume you actually need for the products you dispense most, and hold two or three sizes rather than trying to cover everything with one. If you are consistently transferring into a larger pot at the counter, the range is wrong.

    Headspace is not free

    A container with a lot of air above the tablets carries a lot of moisture with it, and that moisture redistributes into the contents. For hygroscopic products a mostly empty large pot is worse than a full smaller one, even though both are sealed.

    This is why the instinct to standardise on one big size costs money twice: you pay for the container and then for the shortened shelf life.

    Materials

    • Polypropylene: rigid, good moisture barrier, the usual default for solid dose
    • HDPE: slightly softer, good chemical resistance, common in bulk pots
    • PET: clear and rigid, better for products where seeing the contents matters, weaker moisture barrier than polypropylene
    • Glass: inert and impermeable, but heavy and breakable, reserved for products that genuinely need it

    For most dispensing, polypropylene with a wadless or lined closure is the sensible default. Reach for something else only when the product gives you a reason.

    Moisture, and when a desiccant helps

    Hygroscopic tablets take up water from the air inside the container. That can soften them, change how they dissolve, or in some cases degrade the active ingredient. A desiccant sachet or an integrated desiccant cap absorbs that moisture, which extends the useful life.

    A desiccant does not rescue a poor seal

    If the closure is not sealing, the desiccant saturates and then does nothing while the container keeps taking in air. Fix the closure first; the desiccant is for the moisture already inside and the small amount that gets in during normal opening.

    Do not add a desiccant to something that does not need one. It costs money, it is one more thing for a patient to mistake for a tablet, and for products that are not moisture-sensitive it achieves nothing.

    Closures and the patient

    The closure decision belongs with the patient rather than the product. Child-resistant is the expected default for solid dose dispensed to patients, but where someone has arthritis or reduced grip a non-child-resistant closure is the better clinical choice, and that decision should be recorded.

    A patient who cannot open the pot will decant it into something else at home, which loses the labelling, the child resistance and the moisture protection in one go. Supplying an easier closure is safer than pretending the problem does not exist.

    Labelling surface

    A pot has to carry the dispensing label, and the label has to be readable. Tall narrow containers curve tightly, so a standard label wraps and the text distorts at the edges. If your label is being applied at an angle or trimmed to fit, the container diameter is too small for the label stock rather than the label being wrong.

    Check this with the actual label you use before committing to a container range. It is a cheap thing to get right at the ordering stage and an irritating one to live with afterwards.

    When a pot is the wrong choice

    For short courses of a few days, a blister strip in a bag is often better: less packaging, no transfer step, and the original manufacturer labelling stays intact. For anything going into a monitored dosage system the pot is only a transport step, so a plain one is fine.

    For liquids the answer is a bottle rather than a pot, even for a small volume. Pot closures are not designed to seal against liquid, and a pot in a delivery bag will leak.

    A practical stock list

    • Two or three capacities covering the products you dispense most, chosen by volume rather than nominal count
    • Child-resistant closures as the default, with a non-child-resistant option available and recorded when supplied
    • Desiccant sachets held separately for the hygroscopic lines only
    • Containers whose diameter suits the dispensing label you actually use

    Frequently asked questions

    How do I choose the right size tablet container?
    By volume for the products you dispense most, not by the nominal tablet count. That count assumes a tablet size the manufacturer chose, so large coated tablets fill a 100-count pot at half that and small ones rattle around in a third of the space.
    Does empty space in a tablet container matter?
    Yes. Headspace carries moisture that redistributes into the contents, so for hygroscopic products a mostly empty large pot is worse than a full smaller one even though both are sealed.
    What material should tablet containers be?
    Polypropylene is the usual default for solid dose, with a good moisture barrier and rigidity. HDPE suits bulk, PET is clearer but a weaker moisture barrier, and glass is reserved for products that genuinely need an inert container.
    When should I use a desiccant in a tablet container?
    For hygroscopic tablets that take up water from the air inside the container. A desiccant does not compensate for a poor seal: if the closure is not sealing, the desiccant saturates and then does nothing.
    Is a tablet pot always the right container?
    No. For short courses a blister strip in a bag avoids a transfer step and keeps the manufacturer labelling. For liquids use a bottle, since pot closures are not designed to seal against liquid and will leak in a delivery bag.
    All resources

    On this page

    • Sizing by count is unreliable
    • Headspace is not free
    • Materials
    • Moisture, and when a desiccant helps
    • Closures and the patient
    • Labelling surface
    • When a pot is the wrong choice
    • A practical stock list
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