![]() ![]() When I was in school (2007-2010), we had a nursing math test each semester. Here, we have reviewed the basic calculations that you must know, as well as some key factors to consider – such as body weight, the importance of identifying inconsistent units, and the step-by-step methodology that should be followed to work out problems in a logical and consistent manner.In this post, we are going to provide you with EVERYTHING you need to simplify med math. Final Thoughtsĭosage calculations remain one of the most foundational subjects within the broad church of pharmacy calculations. When we apply the same process to ergocalciferol, we learn that the same quantity of vitamin D is found in both formulations.Īnswer: Formulation X contains a greater concentration of vitamin. Therefore, formulation X contains 26,890 IU of vitamin A and formulation Y contains 2,240 IU of vitamin A. ![]() 9.25mg of Vitamin A we must convert this to micrograms, too.Which formulation contains the greatest vitamin concentration? Formulation Y contains 2,240 IU of vitamin A and 10 micrograms of vitamin D. We need 42mg of fluconazole – 42 x 0.1mL = 4.2mLĪnswer: A 3-year old child should be prescribed 4.2mL of fluconazole suspension (50mg/5mL) daily.įormulation X contains 9.25mg of vitamin A (as retinyl acetate) and 400 IU of ergocalciferol. If there is 50mg in 5mL, then 1mg has 0.1mL. The most appropriate formulation is 50mg/5mL of fluconazole suspension. Children under the age of 5 should preferably be administered liquid formulations. The ideal dose is, then, 14kg x 3mg = 42mg of fluconazole.Ĭapsules are ruled out. With this in mind, a 3-year old child has an ideal body weight of 14kg. For example, a 6-year old child has an estimated weight between 18kg and 23kg – that is to say, approx. If the weight of a child is not given, it’s not uncommon to estimate a value. These tables must be consulted when calculating dosage for children. The BNF provides a table with ideal body weights and heights, based on the age of a child. The BNF (“ British National Formulary“, or other international dosing guide) is clear that a “child” is defined as a person under the age of 12 years. Suggest an appropriate formulation.įor these kinds of dosage calculations, you must consult a reference textbook. Calculate the dose needed for a child (3-years old). The recommended dose of fluconazole for mucosal candidiasis in children is 3mg/kg daily. In total, the patient needs twelve 5mg tablets (60mg) and twenty-two 2mg tablets (44mg) – leading to the required dose of 104mg. A further 7mg is required for the next two days – which is two 5mg tablets and two 2mg tablets for 2/7. There would be no 2mg remaining for the second dose of day one of treatment.Įach daily dose needs two 5mg tablets and four 2mg tablets, which is ten 5mg tablets and twenty 2mg tablets for 5/7. 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. A patient has been prescribed 9mg of drug X to be taken twice-daily for 5/7. ![]()
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