## Pharmacy Math Question |

Comments (2) |

Lorian43 in Apex, North Carolina 54 months ago |
Heather, What you want to do first is calculate what your original strength is per ml.
The formula for this problem is final volume over initial volume = initial strength over final strength. Final volume is what you are solving for or (x)ml = 4mg is initial strength
Or (x)ml over 100ml = 4mg over 2mg; Then you cross multiply. So that you would have 2mg times (x) = 100mg times 4mg or 2(x) = 400. Since you are solving for (x) you would divide 400 by 2 and you get 200ml. You already have 100ml so you would just need to add another 100ml of cherry syrup to your original 100ml to equal a concentration of 2mg/ml. Hope that helps |

amy mal in Long Beach, California 33 months ago |
The recommended dose of phenytoin sodium is 6 mg / kg / d administered in three equally divided doses. The phenytoin stock suspension is available in a 12 5 mg / 5 mL concentration. How much should be given to 44 lb. child for each dose? |

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