Helped Over 500,000 patients with 98%+ satisfaction.

Connect & Get Personalized 1-to-1 Answers from Expert Doctors

DoctorSpring > Question Home

False positive pregnancy test due to XANAX, B12 medicines.

Resolved Question:

I take xanax on rare occasion where I am suffering from sleepless nights, etc with anxiety. I took a low dosage this morning and also took a pregnancy test approximately 7 hours later. I took a First Response test which gave me one strong line and a faint second line which they say is a positive. I also took a ClearBlue digital test that says pregnant with a 2-3 next to it which they say means 4 - 5 weeks pregnant. I also take Mucinex Allergy daily and vitamin b12 injections 2 times per week.
My question is... can Xanax, allergy medicine or b12 injections lead to a false positive pregnancy test?

Category: Family Physician-GP

Ask Your Own Question

Category: HIV- AIDS Specialist
 26 Doctors Online

Thank you for your query at
I understand your concern.
The Clearblue pregnancy tests, as you know are 99 % accurate, and if it is showing pregnant with 2-3 + it shows that you're pregnant. The drugs you're taking have no interactions with the pregnancy test because preganacy is indicated by the presence/absence of hcg in the serum or urine. It is a hormone and no drugs change its formation in any way.
You can give me some more details about your cycle length. When was your LMP? What is your normal cycle length? And did you have unprotected intercourse in recent times? This is just to confirm and predict your exact duration of pregnancy based on your history and expected ovulation date.
Also i will advise you to follow up your test results with a gynaecologist, who can correctly advise you which drugs to avoid in pregnancy. And also if required take an ultrasund which is the most conclusive evidence for detecting and approximating the duration of pregnancy.
Hope this was helpful,

Patient replied :

I usually start around the 6 - 8th of the month and so I'm a couple weeks late. Last start date was July 8th. Length is usually 4 to 5 days. I'm pretty regular, unless under extreme stress - which I have been so I didn't think much of it but thought I should take a test anyway.
I'm married so we weren't trying to get pregnant, but weren't not trying either - if that makes sense.
I did schedule an appointment with my doctor but they can't get me in for another week and a half so I'm considering looking for another doctor at this point.

Yeah in that case it does explain the clearblue test results too.
Because if july 8th was your last cycle date then you probably ovulated around the 22nd-23rd and assuming fertilization occured around then, it means you will be around a month pregnant now.
The best result will be given by an ultrasound. These tests still have 1-2 % chances of a false positive results at times. And the etiology is not really known why that happens. But it definitely is not due to the drugs. Hence sooner you can book an appointment with some other doctor and get that ultrasound, the better.
Hope i have been able to help you,

Dr. Jaydeep Tripathy
Category: HIV- AIDS Specialist
MBBS from Sri Ramachandra University in December 2011
M.Med (Family Medicine) - TNMGR University, Chennai
MBA-MPH in Public Health in March 2016, SRM University
Finished AFIH in March 2016, SRM University
MRCP ( UK ), Internal Medicine, Royal College of Physicians, June 2016
Fellowship in Diabetology from Martin Luther University in January 2017

Currently Resident Physician, in MD Radiodiagnosis - Kamakshi Memorial Hospital, Chennai
Dr. Jaydeep Tripathy and 4 other Medical Specialists are ready to help you

Users who read this, also read:

Make informed and better medical decisions.

Join the 500,000 people who found a smarter, quicker way to get Answers, Recommendations & Expert Opinions.

Expert Doctors at fingertips

Recommendation on next step. Second-opinion.Multi-specialty.

Save Time

Average time for answers: 6 hours.

Save Money

$35 for typical specialist consult vs. $120 for a local appointment.

Free Follow-ups

Clarify, ask further questions for free in private conversation.

100% Satisfaction

Money back guarantee for the 1st reply. MEDNET Quality Board.

Start My Consultation



Doctor Spring is a novel online Doctor consultation platform where you can get your medical questions answered by leading Doctors. Just Submit your question and rest assured that you will consult a Doctor easily. Once you submit the question, the Doctor from the concerned specialty will reply within hours. You can always ask more questions or add details with follow-up question options and make it an online doctor chat. You may use this service to consult a specialty or for getting medical second opinion. All paid services come with a MEDNET quality assurance and 100% money back guarantee.

DoctorSpring in news