I wasn’t informed I should avoid dairy while im on doxycycline, ive completed the course and the symptoms are gone. When should I get urine test again?

The issue. Taking dairy & or eating anything within the period the med passes through your stomach can reduce the amount of medication absorbed & available to treat/kill off the germs. If enough med was absorbed in spite of this to do the job success may have occurred. It is reasonable to re-test a week or 2 after completing the med .