Hi,
Any medication after it's action has to be excreted. One way of excretion is thr'o urine.
The drug you are taking contains
RIFAMYCIN - which is the cause for the high colored urine.
It is 100% nothing to worry. After you complete the course of RIFAMYCIN you will be totally alright.
Follow dr's advice regarding food habits, along with medicines + vitamines like B6
best wishes