Medications That Cause False Positive Pregnancy Tests

on Oct 29, 2012

by Dr. Christine Lee, MD

  • Rate this Article:
    VN:F [1.9.20_1166]
    Rating: 4.5/5 (2 votes cast)
Medications That Cause False Positive Pregnancy Tests

When trying to get pregnant, a false positive prgnancy test can be incredibly disheartening. Many medications can affect your test results, so find out which to make sure you are aware of this possibility.

A woman looking to have a baby can go through frustrating times when she discovers on the home pregnancy test a false positive result. Unlike blood pregnancy tests, urine pregnancy tests can display false positive results on account of a number of medications which interfere with the accurate result. Also, incorrect usage of the urine test can lead to false positive or false negative results, too. Claim Your 20 Free Pregnancy Tests – Click Here

The main 6 types of medications that cause false positive pregnancy tests results are as follows.

Human Chorionic Gonadotropin (hCG) hormone

Given the fact that any pregnancy test displays its results based on accurate measurement of the Human Chorionic Gonadotropin (hCG) hormone level, undergoing treatment with HCG injections causes a false rise in the hCG found in the urine and thus a false positive result. This medication is frequently prescribed for women trying to conceive, because it helps to induce ovulation when a woman suffers from lack of ovulation or irregular ovulation. Also, it is prescribed after ovulation for boosting the chances of egg implantation.

Anti-anxiety medication and tranquilizers

Anti-anxiety medication and tranquilizers or sedatives also causes a rise in the hCG level and have you believe you are pregnant. Tranquilizers can refer to anxiolytic medication and to antipsychotics. Prescription anti-anxiety medications include benzodiazepines (Diazepam or Valium, Alprazolam or Xanax), azapirones and hydroxyzine. Antipsychotics are prescribed for psychosis management (schizophrenia and bipolar disorder) and include Droperidol, Chlorpromazine, Clozapine, Triflupromazine, Thioridazine.

Anticonvulsants or antiepileptic

Anticonvulsants or antiepileptic drugs such as barbiturates (Phenobarbital), benzodiazepines, bromides, fatty acids (valproic acid), fructose derivatives, GABA analogs, Primidone and triazines can also cause false positive tests.

Anti-Parkinson medications

Anti-Parkinson medications also determine a rise of the hCG level in urine. These include Phenylalanine, Tyrosine, dopamine increasing drugs like Bromocriptine and anticholinergics like Benzatropine and Scopolamine.

Some prescribed diuretics

Some prescribed diuretics, used to increase the urine output can also lead to false results. These include loop diuretics like Furosemide, spironolactone, thiazides and osmotic diuretics like mannitol and glucose.


Promethazine, a drug used to treat allergies, motion sickness, and vomiting and which has a powerful sedative effect, can also create misleading test results as well.

All these abovementioned medications that cause false positive pregnancy tests determine an increased level of the Human Chorionic Gonadotropin hormone in the urine, thus misleading a woman into believing she is pregnant. Prior to taking the home pregnancy test, it is advisable to avoid these medications altogether so as to prevent false positive results. For more accurate results, blood pregnancy test kits are recommended.

ConceiveEasy TTC Kit + 20 FREE Pregnancy Tests

ConceiveEasy® TTC Kit™ is the most complete fertility system available over the counter. Clinically proven to dramatically increase your chances of conception and help you get pregnant fast from the very first use. And now for a limited time, Try a FREE starter pack today & receive 20 FREE pregnancy tests and a FREE Digital BBT Thermometer!

Medications That Cause False Positive Pregnancy Tests , 4.5 out of 5 based on 2 ratings

Dr. Christine Lee earned her Ph.D. in Developmental Biology and Master of Science in Biomolecular Organization. Dr. Lee is Lab Director for ConceiveEasy and is board certified as a High Complexity Laboratory Director (HCLD).

Related posts:

  1. False Positive Pregnancy Test
  2. False Positive Pregnancy Test Results
  3. False Negative Pregnancy Tests
  4. Types of Pregnancy Tests
  5. hCG Level and Early Pregnancy
  • Stephandy1209

    Hello I had a positive preg test on 2/25 called the dr and the nurse told me that since i was given human menopausal gonadotropin on 2/12 that it probably is a false positive.  I have not seen anywhere that says that HmG can cause a false, however, i see that HcG can, are they the same?  I am having lots of vomiting and nausea, headaches, exhaustion, “pregnancy braind”, and abd pn.  The nurse claimed it was because i was about the start my period.  When i was tested for progesterone my levels were only 4.5, and the nurse told me i “barely ovulated”, i asked what that meant, she said that chances are I didnt ovulate.  Please help!

    VA:F [1.9.20_1166]
    Rating: 0.0/5 (0 votes cast)
  • Sarah

    Hi my period isn’t due for 2 weeks or a week if if I go by the 3 weekly pattern my period has been taking lately but last night I got a strong positive on a cheap brand test could this be a false positive due to the buscopan I’m taking

    VA:F [1.9.20_1166]
    Rating: 0.0/5 (0 votes cast)
  • Chelsea

    I started taking Palafer Iron (ferrous fulmar ate 300mg) a week ago. My husband and I have been trying to conceive for 15 months now. We have had 2 miscarriages. The last one was 3 months ago. I just got a positive on a hpt. Could this be from my perscription or is more likely to be true

    VA:F [1.9.20_1166]
    Rating: 0.0/5 (0 votes cast)
  • Jamie

    Is it possible for a staph infection or the seizure medicine keppra to cause high hcg levels?

    VA:F [1.9.20_1166]
    Rating: 0.0/5 (0 votes cast)

    Hello, I had vaser liposuction on the abdomen and flanks 5 1/2 weeks ago. I could have sworn I was getting ready to start my period before my procedure
    on 3/17. It was running a few days late but I figured it was just because of nerves. As time has gone by I never started my period. I took a home pregnancy test and a blood pregnancy test yesterday, both showing up positive. I am wondering if maybe it is just a change in hormones or if it could be due to the medicines I was on. I was given a large injection of saline and epinephrine in my abdomen. I took 2 Alprazolam (Xanax) and was given “laughing gas” the day of the procedure. Then for about 2 weeks I was taking Hydrocodone and Cephalexin. I have been taking Benedryl and a Muciniex Sinus for this last week. Is there any chance that any of these medications or the stress of the surgery can cause a false positive? If not, how serious are the risks if I were pregnant when I had Lipo done?

    VA:F [1.9.20_1166]
    Rating: 0.0/5 (0 votes cast)
  • Curious

    How do diuretics cause false positive if they dilute urine? Wouldn’t they cause false negatives?

    VA:F [1.9.20_1166]
    Rating: 0.0/5 (0 votes cast)
  • Joni

    Can any of these medications cause a false negative? I have a 10 month old and haven’t had a normal period since having him. Once my period started back up again I was bleeding for about 10 days at a time with only a 4 or 5 day break in between. I was on birth control pills but recently discovered that many of my medications I take for Crohns disease neutralize the bc. It has now been about 8 or so weeks since my last long bleeding stint. I have every symptom of my last pregnancy including spotting from stress and sexual intercourse. However I have taken tons of tests and no positive results. Any insight as to what could be going on? I figured after another week with no bleeding I should probably get a blood test. I do have a major CT scan with iv contrast and enterography scheduled this week and if I am pregnant that would scare me. That and I am on a lot of medications to ease symptoms of Crohns and RA. Thanks for any help.

    VA:F [1.9.20_1166]
    Rating: 0.0/5 (0 votes cast)
  • lee

    can 10 mg cause false positive pregnancy test

    VA:F [1.9.20_1166]
    Rating: 0.0/5 (0 votes cast)
meet the Experts
Cart preview 1 Out of 1 items




Your Exclusive Free Bonus Gift:

20 FREE Pregnancy Tests
20 FREE Ovulation Tests
10 Pregnancy/10 Ovulation Tests