Math Problem! Procalc...

Tagamet is available in liquid form labeled 300 mg in 5 mL. 0.3 g of Tagamet has been prescribed PO. How many mL should you administer?

I need tutorial on how to solve this. The answer is 5mL from the practice question. I just dont understand how to do this math. Simple form...Can anyone help me out here?

Thanks

1 g = 1000 mg so 0.3 g is the same as 300 mg so 5 mL gives you your 0.3 g (300 mg) dose

Set your problem up as follows:

0.3g = 300 mg

Order: 300mg

On Hand: 0.3 per 5mL

300 mg

------ x 5 mL = 5 mL

300 mg

the way you come to the answer is that 300mg/300mg cancel out to equal 1

now take 1 and multiply it by the 5 mL

Answer: 5 mL

HTH!

Tagamet is available in liquid form labeled 300 mg in 5 mL. 0.3 g of Tagamet has been prescribed PO. How many mL should you administer?

I need tutorial on how to solve this. The answer is 5mL from the practice question. I just dont understand how to do this math. Simple form...Can anyone help me out here?

Thanks

the way i do is to make a grid. the dr ordered 0.3g and you have on hand 300mg in 5 mL. you have to convert the order into what you have on hand. so the first grid would be 1 gram = 1000mg; then plug in what the dr ordered which is 0.3 g over X mg, because mg is what you are looking for then simply do the math.

___0.3 g = ____1____g

x mg 1000 mg

x.1 = 0.3 . 1000

1x = 300

divided both sides by one, which cancels out and 300 over 1 is 300, so now your ready for your next grid.

Now in this grid, plug in what on hand, which is 300 over 5, and then take the 300 from the first equation and plug it in.

__300_mg = __300___mg

x mL 5 ML

x.300 = 300 . 5

300x = 1500 divide both sides by 300 and the answer is 5ML.

Hope this helps.