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Group Question Medicines that are injected into humans intravenous fluids and/or shots, must be at the same concentration as the existing chemical compounds in blood. For example, if the medicine contains potassium ions, they must be at the same concentration as the potassium ions in our blood Such solutions are called isotonic. Why must medicines be formulated in this fashion?
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The medicines are formulated in the fashion of blood and the drug concentration as to have the balance in the movement of the cell intra and extracellular to have a desired out come of a drug.

When the two concentration are the same for example isotonic than the total molar concentration in both the solutes remains the same. The water outside the cell is balanced by water into the cell.

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