The primary causes of dark-colored urine in women include dehydration, eating certain types of foods, taking certain medications, urinary tract infections, and liver, bladder or kidney problems, according to WebMD. Other primary causes include muscle injury from extreme exercise and blood in the urine.
Dark urine is typically a sign that the body is not getting enough fluid, leading to dark, concentrated urine. Women taking antibiotics such as metronidazole (Flagyl) and nitrofurantoin, laxatives and muscle stimulants with senna, cascara or methocarbamol, or antimalarial drugs such as primaquine and chloroquine may also experience dark urine, reports Mayo Clinic. Food substances such as carotene, beets, blackberries and food coloring have the potential effect of causing dark urine as well.