For How Long Does Promethazine 25mg Stay In The System?

Hi, may I answer i currentlt have been taking urine samples, it has come back detected for benzodiazepines, the following days before my urine sample i had an allergy, the doctor came to my house and gave me an injection of promethazine 25mg . from the day in which the dctor had given my the injection and my urine sample was about eight day. can this still be in my system. i haven't drinken or taken anythin . will this affect my case also.your health queries right now ? Please