That’s because the patient would run out of 2mg tablets! 9mg dose alone requires 5mg + 2mg + 2mg. It would be wrong to prescribe twenty 5mg tablets and two 2mg tablets – even though it totals 104mg. 14mg required for the next two days (2/7).18mg x 5 days = 90mg for 5 days of drug X (5/7).How many tablets of each strength should be prescribed to the patient? Drug X is only available in 2mg and 5mg tablets. She is also prescribed 7mg once-daily (of the same drug) for the remaining 2/7. There are seven drug dosage calculations to attempt you will be able to check your answers when you have completed all of the questions.A patient has been prescribed 9mg of drug X to be taken twice-daily for 5/7. You can test what you have learnt with this drug calculations quiz. The available stock on the ward is 10mg/5ml (10mg in 5ml) elixir. Stock strength (what you’ve got): 100mgĪ patient requires dihydrocodeine 30mg.The strength required (what you want): 200mg.The available stock on the ward is 100mg/ml (100mg in 1ml) oral solution. How to calculate a liquid medication dosageĪ patient requires amisulpride 200mg. How many tablets should the nurse administer to patient X if the available stock strength on the ward is 2.5mg? The doctor prescribes bendroflumethiazide 7.5mg on patient X’s drug chart. Stock strength (what you’ve got): 10mg in one tablet.The strength required (what you want): 20mg.The available stock strength you have is 10mg. The Doctor prescribes promethazine hydrochloride 20mg for patient X. How to calculate the number of tablets required If you are unsure how to convert from one unit of measurement to another, take a look at the conversion table. Or another way this liquid dose formula can be expressed is: ( What you want / What you’ve got) × What it’s in = Volume dose required Worked examples with stepsīefore working through these worked example questions and attempting the drug calculations quiz in the next part, remember to make sure the strength required and stock strength is always in the same units of measure (ie., both ng, both mcg, both mg or both g). To calculate the volume dose for liquid medicine, use this formula: (Strength required / Stock strength) × Stock volume = Volume dose required Or another way this drug dosage formula can be expressed is: What you want / What you’ve got = Number of tablet(s) required To calculate the number of tablets, use the following formula: Strength required / Stock strength = Number of tablet(s) required Finally, in part 3, you can test what you have learnt by attempting the drug calculations quiz.In part 2, you will find worked examples (with steps) on how to calculate the required number of tablets or volume of liquid medicine.Part 1 will define the two formulas that can be used to calculate the drug dose required from stock strength for both oral tablets/capsules and oral liquid medicines.This learning is divided into three parts. The aim of this guide is to learn how to calculate a drug dosage from the stock strength. This how-to guide on drug dosage calculations has been created for student nurses, pharmacy students, pre-registration pharmacists and pharmacy technicians.
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