Blue
urine color is most likely caused by foods you have eaten lately or medications
you are taking.
Medications and drugs can cause your urine to turn blue, since many of these contain dyes. Think of the little blue pill that some men take to help them out with erectile dysfunction. Yes, we're talking about Viagra. Some medications, can also have a side effect of changing your urine color to blue.
First you need to ask yourself if it is really blue urine, or could it be green urine color?
The following medications may cause a blue urine color:
Triamterene – This is a pteridine that is a mild diuretic and can
cause a blue urine color.
Rinsapin – This is an antibiotic sometimes used to treat a staph
infection and can cause you to see a blue or green urine color.
Any other medication that uses a blue dye in the medicine.
There are no known diseases that would cause a blue urine color, so if your urine looks blue, it is most likely related to something you have ingested.