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III. Parenteral Dosage 10. Gentamycin 50 mg IM q12h. How many ml of the drug must be administered if the stock is 80 mg/2ml?
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Answer #1

10.Given

Order:Gentamycin

Dose:50mg

Route:IM

Frequency:Twice a day

Available:80mg/2ml

When 80mg=2ml

Then 50mg=??ml

Cross multiply and divide

=50×2÷80

=100÷80

=1.25

Ans:1.25 ml of drug to be administered

11.Given

Order:Ceftazidime

Dose:250mg

Route:IM

Frequency:Three times a day

Available:1g/vial (1000mg/vial)

When 1000mg=1vial (the dilution is 10ml of distil water or sterile water) so it is 10ml

Then 250mg=??ml

Cross multiply and divide

=250×10÷1000

=2500÷1000

=2.5

Ans:2.5ml

12.Given

Order:Amikacin

Dose:20mg

Route:IM

Frequency:twice a day

Available:100mg/2ml

When 100mg=2ml

Then 20mg=??ml

Cross multiply and divide

=20×2÷100

=40÷100

=0.4

Ans:0.4ml

=

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