Test negative for chlamydia due to antibiotics

Dear Ask The Doctor: I took a Chlamydia test recently with my doctor which came back clear. However before I give my urine sample for the Chlamydia test the Dr prescribed me antibiotics in case it was a urine infection and I started them before I give my sample the next day. My question is because this antibiotic was in my system could this have affected the results of my test.

Dear Ryan: Since you were prescribed antibiotics before the test, there is a small chance that the negative test could be the result of the antibiotics. I would advise you to continue with your antibiotics and avoid unprotected intercourse. It is important to test your partner for the infection because there is a chance for re-infection if both couples are not treated.