The actual therapeutic dose is 0.1 mg/kg, so the appropriate dose in most cases would be 7-8 mg (or 20 mg in Texas).
Typically I give 4 mg for most of the BS pain, however someone with an obvious fracture or injury will get 8 mg. The nurses usually don't argue in those cases.
I agree with GV - I give 4mg to most everyone, and 8 if I really think their pain is legit.
Incidentally, the therapeutic dose is usually expressed as a range from 0.1 to 0.2 mg/kg, so 0.1 is on the low end. But really I'm just adding that for completeness sake as I don't mean to trump GV... I don't pretend to be any more expert then him (Bulge tips hat GV's way).
As for the Dilaudid, I also practice like Quinn -- I give a lot of Dilaudid, and typically in 2mg aliquots. Generally speaking, you can assume that 2mg dilaudid is roughly equal to 10mg morphine and as you might imagine, the nurses don't seem to mind giving "2" of D compared to giving "10" of M.
Of course, any time you're talking dosing equivalents, well... here there be dragons. The 1:5 ratio is definately a rough gestimate depending on patient kinetics, other drug-drug interactions, the source I'm quoting from, and the direction of the prevailing wind.
If anyone is interested, here is a conversion chart that I use for converting between different opiates and routes of admin. This was my "best guess" chart when synthesizing multiple sources including Pharmacopeia, some basic pharmacology texts, and two of the "pain boys" at our institution. No doubt, if each of us were to post their own it would be slightly different; But it has stood me well for several years. You're welcome to borrow, copy, suggest edit, or just ignore. Keep in mind that my "reference" dose was chosen because I think I put it together when I was doing an inpatient month and was trying to convert/adjust for in-hospital, at-home medication regimens, etc.
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Bulge's Narcotic Conversion Chart
Reference: Morphine – 60 mg Parenteral (IV, IM, SC) Daily dose
Oral Methadone: 1/6 to 2/3x, therefore 10 – 40 mg
Oral Hydromorphone: ¾ - 1x, therefore 45 – 60mg
Oral Morphine: 1.5 – 3x, therefore 90 – 180 mg oral (naïve – chronic)
Oral Oxycodone: 2x, therefore 120 mg
Oral Hydrocodone: No consensus
Parenteral Hydromorphone (Dilaudid): 1/6 – 1/5, therefore 10 – 60 mg
Fentanyl
Parenteral: 50-100 mcg q1-2h, titrated to effect. Can use IM, too.
Fentanyl: 50-100 mcg/h patch changed q72h.
Use the higher patch strength at low oral morphine equivalents (e.g. 25 mcg patch for 45 – 134 mg morphine/24h) and a relatively lower patch strength at higher morphine doses (200 mcg patch at 675 – 764 mg/24h)