U.S. doctors online nowAsk doctors free
A 38-year-old female asked:

My drug screen results were negative, why? i take percocet and ativan (lorazepam) on a daily basis, my screen results did not find them in my system. knowing that i take my meds daily, i cannot understand why they did not show.

2 doctor answers3 doctors weighed in
Dr. Joy Jackson
Family Medicine 21 years experience
In : In short a few explanations; #1 your test gave a false negative result (possible but not very common) #2. The urine or blood was not yours (lab error, paperwork error, in short human error). #3 Percocet and Ativan (lorazepam) were not specifically screened for in the particular drug testing that was done (meaning although drugs in their class may cause a positive result, the biochemical make-up of Percocet and Ativan (lorazepam) may have not caused a positive reaction).
Created for people with ongoing healthcare needs but benefits everyone.
Dr. Alan Wartenberg
A Verified Doctoranswered
Addiction Medicine 51 years experience
Many possiblereasons: Oxycodone may not show up on a drug screen unless the screen is specifically geared to that drug. Ativan (lorazepam) should show up, but it depends on the dose. If you are on a low dose (0.5 mg a day) it may be negative. Also, if you are drinking large amounts of water, it dilutes your urine to where drugs may be below the detection limit of the test.
Created for people with ongoing healthcare needs but benefits everyone.

Related questions

A 31-year-old member asked:
Can percocet and ativan (lorazepam) be taken together?
1 doctor answer3 doctors weighed in
A member asked:
How long is ativan (lorazepam) detectable in a urine drug screen?
3 doctor answers15 doctors weighed in
A 31-year-old member asked:
Ativan (lorazepam) didn't show up on my drug test why? I take it but not daily
1 doctor answer6 doctors weighed in
Last updated Mar 26, 2021

Disclaimer:

Content on HealthTap (including answers) should not be used for medical advice, diagnosis, or treatment, and interactions on HealthTap do not create a doctor-patient relationship. Never disregard or delay professional medical advice in person because of anything on HealthTap. Call your doctor or 911 if you think you may have a medical emergency.