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  • Calculations :-/

    Hi, I'm currently doing the NVQ level 3, module 12.

    How do I calculate the amount of a drug (ie 10ml in preparations such as 6mg in 2.5ml?? I’m getting in a right pickle!

  • #2
    Work out how much drug is in 1ml then multiply by 10ml.

    Or else multiply 2.5ml x 4 to get 10ml, therefore multiply 6mg x 4 =24mg in 10ml

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    • #3
      Ok.. Even more confuesed now.

      so I've got to calculate 10ml in the following preperations...

      5mg in 5ml

      so 2 x 5 = 10ml? 5mg x 2 = 10?

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      • #4
        Take it to 1mg/1ml and then work up from that.

        5mg/5ml = 1mg in 1ml

        10ml would have 10mg etc

        or take it up to another strength to get rid of the decimal.

        6mg in 2.5ml

        12mg in 5ml

        24mg in 10ml

        2.4mg in 1ml


        Have a practice with some of the injections (work out how much in the total injection from concentration per volume and ampoule/vial size)

        Here's one to get you started.

        Amoxcillin 125mg/5ml

        How much amoxicillin in a 100ml bottle?

        What volume is needed to dose the patient with 375mg ?

        47 BC : Julius Cesar : Veni Vidi Vici : I came, I saw I conquered.
        2018 AD : Modern Man : I shopped, I clicked, I collected.
        How times change.

        If you find you have read something that has upset or offended you an anyway please unread it at once.

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        • #5
          I'm so lost with this! every one I ask comes up with another way of doing this... I'm getting really frustrated.

          I don't know what I'm meant to be calculating :-(

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          • #6
            You might be reading more into it than there actually is there!

            Easier to see it 'developed' as you work it out.
            Ask the pharmacist where you work to run through it with you?
            47 BC : Julius Cesar : Veni Vidi Vici : I came, I saw I conquered.
            2018 AD : Modern Man : I shopped, I clicked, I collected.
            How times change.

            If you find you have read something that has upset or offended you an anyway please unread it at once.

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            • #7
              I've been helping a friend with with module recently too, it helped her to get her head around it using 'real world' scenario first, slow down and just read what the question is asking, break it down. ''how much is in 1ml" is a question I ask myself everyday at some point, it's a good place to start. Also the module book has the formulas you need, but you need to learn them the exam is closed book I believe.

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              • #8
                Ok, please help, what do i calculate?? I'm confused again lol..



                Simple linctus BP. 250ml
                Syrup BP. to 1000ml

                Calculate the quantities of each ingredient required to dispense 250ml

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                • #9
                  Calculate:

                  Want (10ml) divide by what you have got (6mg) multiply by the mixture is in (in this case 2.5ml). Cross off the mg to be left with mls. And you are left with 4.1666 (4.17 mls).

                  WANT \ GOT X VOLUME =

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                  • #10
                    Pharmacy calculations usually involve percentages and proportions. Have a look on utube.
                    johnep

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