1. Dose= Required concentration /total concentration × amount to be dissolved
Here hydromorphone required 2mg
Total hydromorphone =4mg
Amount to be dissolved =1ml
So, 2/4×1=0.5ml
2. The equation same as above
Required concentration =20mg
Total concentration = 50
Amount to be dissolved =1 ml
So, 20/50×1=0.4ml
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Ordered: hydromorphone HCl 2 mg promethazine 20 mg S IM stat for a patient in pain...
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