Question

A patient is admitted for asthma and the physician order reads. Start Theophylline at 1.2 mg/Kg/an hour. the IV is mix theophylline 500 mg to exactly 1000ml of normal saline. The patient weight 132 pounds.

how many Mg per hour do you give.

How many ML per hour do you give

Answer 1

order dose = 1.2 mg/kg/hr

available dose = 500mg /1000 ml

weight of the patient = 132 pounds ( change it to kg as the ordered dose in given is Kg, 1kg = 2.2 pounds, so divide the given pounds with 2.2 to get kg)

= 132/2.2 = 60 kg

Calcute the mg per hour

Order dose= 1.2 mg/kg/hr ( this means for every 1 kg, 1.2 mg have to administer)

For the calculation of mg per hours for 60 kg, multiple the mg order per 1 kg by actual kg)

= 1.2 x 60 = 72 mg

Hence 72 mg will be administered.

Calculation of ml per hour

use the formula,

ml per hour = (order dose / available dose) * available ml

= (72 mg/500 mg) * 1000ml ( Note: as we are going to give the medication for 60 kg patient so we have to use the ordered dose for 60 kg, not 1 kg ordered dose)

= 144 ml

Hence 144ml will be administered every 1 hour.

=