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Basic Drug Calculations. General Rules. NEVER give a drug without consulting a clinician on your calculations You will need: Weight of patient Dose of drug Concentration of drug. Patient Weight. in Kilograms (kg) Should be taken every morning Use the same scale! Weigh, then calculate.

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Presentation Transcript
general rules
General Rules

NEVER give a drug without consulting a clinician on your calculations

You will need:

Weight of patient

Dose of drug

Concentration of drug

patient weight
Patient Weight
  • in Kilograms (kg)
  • Should be taken every morning
  • Use the same scale!
  • Weigh, then calculate
drug dosage
Drug Dosage
  • usually in mg/kg
  • will be different for different routes and frequencies of administration
  • can be found in:
    • exotic formulary
    • from clinician
      • meloxicam
      • fluids
drug concentration
Drug Concentration
  • usually in mg/ml
  • can be found on the bottle
  • ALWAYS check the concentration of the drug you are actually using
the actual math
The Actual Math...

Ex: Pip Orbifloxacin

  • weight: 1.12 kg
  • dose: 15 mg/kg
  • concentration: 30 mg/ml
  • amount: 0.56 ml

1. weight (kg) x dose (mg/kg) = mg

2. mg x concentration (mg/ml) = amount to administer (ml) *you are actually dividing

**Fluid doses are in ml/kg so you only need step 1!

on your treatment sheet
On Your Treatment Sheet...
  • Name of drug
  • Dose
  • Concentration
  • Actual Amount
  • Route of Administration
    • SQ, IM, IV, PO, eye drop, etc
  • Frequency
    • SID, BID, QID, TID
    • or q12h, e.g.
  • Orbifloxacin
  • 15 mg/kg
  • 30 mg/ml
  • PO
  • BID