Quote:

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However, it is now considered that a dose of 15 mg (1/4 gr) of hydrocodone is equivalent to 10 mg (1/6 gr) of morphine. Hydrocodone is considered to be morphine-like in all respects.

My poor math skills tell me that 15 mg is 1/67 gr
and 10 mg is 1/100 gr. Correct me if I'm wrong.

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The source of your confusion appears to be the failure to differentiate grains from grams. As you correctly note in the first paragraph, 15 mg.= 1/4 grain (one grain, the English apothecary unit of measurement, is approximately 60 milligrams, the metric unit of mass). In your second paragraph you may be confusing grains (gr.) with grams (g). 15 mg. is indeed 1/67 of a gram, but 1/4 of a grain. Likewise, 10 mg. is 1/100 of a gram but 1/6 of a grain. Other than missing the distinction between grains and grams, though, your math skills are not bad at all .

Peace,
Jack