converting mg to ml with weight of animal in kg

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converting mg to ml with weight of animal in kg

Postby Stephanie » Thu Feb 21, 2008 2:43 am

I am having such a hard time with converting a drug in mg/ml to ml in order to give to an animal. For example if giving 100mg of 4%lidocaine 40mg/ml to a 156lb (71kg) to an animal. how much ml is that??? Can anyone give me an easy formula to figure all this out?
Stephanie
 

Re: converting mg to ml with weight of animal in kg

Postby Guest » Thu Feb 21, 2008 3:06 am

Stephanie wrote:I am having such a hard time with converting a drug in mg/ml to ml in order to give to an animal. For example if giving 100mg of 4%lidocaine 40mg/ml to a 156lb (71kg) to an animal. how much ml is that??? Can anyone give me an easy formula to figure all this out?


I think the weight is irrelevant here. Sometimes doses are weight-related and stated mg/kg (you would multiply the dose instruction by the animal's weight), other times they are an absolute dose in mg.

To give a absolute dose, 100 mg, divide by the strength 40 mg/mL. Dose is 2.5 mL

As an alternative, you can write the strength inverted and multiply:
100 mg x 1 mL/40 mg = 2.5 mL (note how the mg terms cancel out)
Guest
 


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