Regardless of which pregnancy test a woman takes, most over-the-counter medications and drugs will not affect the test result. The Office on Women’s Health is part of the U.S. Department of Health and Human Services. Their mission is improving the health of all U.S. women and girls. According to their Pregnancy Tests Fact Sheet most over-the-counter and prescription medication will not affect the results of a home pregnancy test. This includes antibiotics and birth control pills. The only medications that can display a false positive test result are those that contain the pregnancy hormone hCG, such as most medications used to treat infertility
Medications that contain hCG, or are used in combination with hCG, include, but are not limited to, Humegon, Pregnyl, Profasi, Pergonal, and Novarel. These may give false positive results if the pregnancy test is performed within 7-14 days of the last drug administration.
Antibiotics, analgesics or pain killers, birth control pills, and hormone therapies that contain Clomid or Serophen (clomiphene citrate) should not affect the test result.
Furthermore, narcotic drugs like ecstasy, cocaine, marijuana, heroin and even alcohol will also not affect a pregnancy test result. A woman should also not be under the influence of narcotics when performing a pregnancy test and it is highly advised that women refrain from using drugs and alcohol when trying to become pregnant.
Home urine pregnancy tests are approximately 97% accurate when they are performed properly. As they are fairly inexpensive when compared to a blood test, are simple to use, provide a fast answer, and can be easily obtained online or over the counter, they are a great choice for predicting pregnancy.