Dosage Calculation

i was wondering if someone could help me with some formulas

bicillan la 200,000 units is ordered im as a one time dose. the medication comes in a prefilled syring containing 1.2 million units in 2 ml. how many ml would you give.

i do my calculations with the what i have on hand and what i want calculations. i'd set up the first problem like this

(what i have, aka the info i know) 1,200,000/2ml = (what i want) 200,000/x you would then cross multiply (1,200,000 multiplied by x and 2 multiplied by 200,000. you then have 1,200,000x=400,000 now isolate x by dividing both sides by 1,200,000 and you have x=0.33ml

ordered for a burn patient 5000 ml over 8 hours. what should the infusing rate be, knowing infusion pumps are calcualted in ml/hr

this the infusing rate is pretty straight forward. you want to put 5000ml into the patient over 8 hours right? so divide 5000 by 8 and you get an infusion rate of 625ml/hr

amoxicillin comes 5000mg in a powder form to be reconstituted. the instructions recommend adding 100 ml of water. how many mg of amoxicillin ar ein 5ml of suspension?

ok so we know once reconsituted you would have 100ml and in that 100ml is 5000mg. divide 5000 by 100 to get the per ml mg which is 50mg/ml. its asking for how many mg in 5ml so you would multiply 50 x 5 and you have 250mg/5ml

i need help understanding the formula, i think i get it but am not sure, i do not want the answer, i want to understand how to figure the answer out

i hope my explanation helped a little bit, its hard to show on the computer since it won't set up the formula correctly (i am hoping my calculations are correct..i'm beat to hell tonight.)

WOW! Thank You, I have a lot of problems I have been trying to figure it out but you helped me, Thank You again

You're quite welcome. Glad I could help.

awsome explanation for me....I am still trying to grasp the math concept here.

Have you tried dimensional analysis? The drug dosage class at my school teaches exclusively dimensional analysis. It makes it so easy to figure out the problems.