Math Help!!!

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Can someonne be kind to help me with the below question. i got stucked on it preparing for my med admin. exam.

All contributions welcomed.

Prescription is to give 250 mg Ancef IM every 8 hours. The medication is available as a powder in a 1 gram vial. The reconstitution directions state to add 2.5 cc of water to the vial. Shake well till dissolved. The solution concentration will equal 330 mg/ml. Fluid volume will equal 3.0 ml. How much solution do you give each time?

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Specializes in med/surg, telemetry, IV therapy, mgmt.
Prescription is to give 250 mg Ancef IM every 8 hours. The medication is available as a powder in a 1 gram vial. The reconstitution directions state to add 2.5 cc of water to the vial. Shake well till dissolved. The solution concentration will equal 330 mg/ml. Fluid volume will equal 3.0 ml. How much solution do you give each time?

You can use the formula Dose desired divided by dose on hand multiplied by the amount the dose on hand is in.

250 mg
(dose desired
)/330 mg
(dose on hand)
x 1 mL
(amount the dose on hand is in)
= 0.7575 mL
, round off to
0.8 mL
[syringes are only marked in increments of tenths on a mL]

another way you can work this problem is this:

250 mg
(dose desired)
/1 gram
(dose on hand)
x 3 mL
(amount the dose on hand is in)
/1 x 1 gram/1000 mg
(conversion factor)
= 0.75 mL
, rounded off to
0.8 mL

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Thanks so much for the help. I really appreciate the prompt responses.

Thanks again

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Specializes in L&D, Orthopedics & Public Health.

Just remeber not to read too much into the problems. I always circle only the information that I need like Rx dose ( want ), whats available (have) and the mL's I have. hope this helps.

Can someonne be kind to help me with the below question. i got stucked on it preparing for my med admin. exam.

All contributions welcomed.

Prescription is to give 250 mg Ancef IM every 8 hours. The medication is available as a powder in a 1 gram vial. The reconstitution directions state to add 2.5 cc of water to the vial. Shake well till dissolved. The solution concentration will equal 330 mg/ml. Fluid volume will equal 3.0 ml. How much solution do you give each time?

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