Re: [Gnumed-devel] Medication schema - how to represent concentration

[Karsten Hilbert]

On Sun, Sep 04, 2011 at 02:12:44PM -0700, Jim Busser wrote:

> It was how to store in consumable_substances.
> 
> The values 'amount" and 'units' carry simple values only
> for solid forms like tablets and capsules. Liquid forms (and
> some powders) require to express
> 
>       a certain amount of medication
> in
>       a unit of volume or weight of the product
> 
> e.g. aluminum hydroxide 165 mg per 5 mL

No, not really. The ref.consumable_substance table holds
substance names along with their typical/ available/
recommended dosages. Perhaps a better name might be
ref.pre_dosed_consumables or something to that effect.

Let's assume 100 tablets of 50mg metoprolol each:

        preparation: tablet
        amount: 50
        unit: mg
        dosage: 1-0-1
        instruction: take with water

Let's assume 100g cream containing 1.16g of diclofenac:

        preparation: cream 1.16 mass-%
        amount: 1.16
        unit: g
        dosage: 2cm cream 5 times per day
        instruction: apply to skin at site of pain

Let's assume 100ml syrup containing 50mg Cefaclor per 1ml:

        preparation: syrup 50mg/ml
        amount: 5
        unit: g
        dosage: 2ml 2 times per day (= 100mg twice daily)
        instruction: give 2ml morning and evening until used up

Similar: Let's assume 100 tablets of 100mg metoprolol each:

        preparation: tablet
        amount: 100
        unit: mg
        dosage: 1/2-0-1/2
        instruction: take with water

In the above the "100g" or "100ml" are equivalent to "100
tablets of metoprolol".

So, the amount-unit combination means: amount per
pre-supplied form factor (1 tablet, 100ml syrup, 100g cream)

        ...

of which to take a certain fraction (1 tablet, 1/2 tablet,
2ml, 2cm) a certain number of times per time period
(once/twice/five-times per day).

Karsten
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