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Dehydration or medication causing urine to be dark?

I have had excessive thirst since surgery and drink about 7 to 8 16 oz bottles of water daily plus other fluids. Still I remain thirsty all the time and I am urinating a lot. But when my urine comes out it's dark and has a very strong odor. Could the constant thirst and dark urine mean I'm still not drinking enough or could it be the hydrocodone I am taking. I have weened off the soma and finished the antibiotic. Thank you in advance!

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