In May 2018, the Brain and Behavior journal released a report looking at how a medicinal spray containing chemical compounds in the cannabis plant impacts driving ability. According to the study, the spray, which contains both tetrahydrocannabinol and cannabidiol, was found not to impair driving performance.

Despite the study, it’s still illegal to drive under the effects of THC. However, CBD, which doesn’t include the psychoactive properties associated with THC, is believed to be safe. That’s good news for the millions of people who use CBD to treat everything from anxiety to chronic pain.

However, while it might be safe to drive while taking CBD oil, there are a few things CBD users should avoid. Each person’s body reacts differently. So while CBD might not have the same impact on everyone, it’s always good to be cautious.

Here are three things you might not be able to do while taking CBD oil.

1. Pass a Drug Test

In October 2018, an Atlanta news outlet reported that a woman failed a drug test after taking CBD oil. And according to Consumerlab.com, a web-based company that tests nutritional supplements, failed drug tests involving CBD consumption aren’t entirely uncommon. In the WSB-TV report, the company claims up to 10 percent of users test positive for THC when using CBD oil.

While hemp-derived CBD doesn’t contain the same levels of THC as marijuana, taking CBD oil can still lead a person to fail a drug test.

Drug tests are designed to find trace amounts of THC in urine. These tests can detect even minimal levels of THC  up to ten days after exposure. Additionally, for frequent marijuana users, THC can stay in the system for as long as three months from the time a person stops using.

This can present problems for daily CBD users, depending on how the CBD is extracted. Hemp-based CBD oils typically contain minimal amounts of THC, equal to .3 percent or even less. However, CBD oil derived from marijuana plant strains can contain high amounts of THC.

Consuming hemp-based CBD should be largely safe for those worried about passing a drug test. Most CBD users take between 120 and 160 milligrams daily on average. In order for the trace amounts of THC in hemp-based oils to be detectable, a person would have to take as much as 1,000 milligrams a day.

Those worried about passing a drug test should steer clear of taking CBD oil extracted from marijuana plants. Additionally, since everyone’s metabolism is different, people who are subject to drug tests should proceed with caution when using hemp-based CBD oil as well.

2. Take Certain Medications

There are numerous prescription drugs that interact poorly with each other. Likewise, there are certain medications that might not interact well with taking CBD oil. That’s because, in certain quantities, CBD can temporarily deactivate the body’s cytochrome P450 system.

This system is responsible for the body’s ability to metabolize certain drugs. When the cytochrome P450 system is inhibited, it can lead to an overall increase in the amount of time it takes the body to process certain drugs.

When your body’s drug processing ability is affected it can lead to higher levels of certain drugs in your system at one time. As a result, you might experience unwanted and even dangerous side effect including an overdose.

Taking CBD oil can potentially impact how a person metabolizes a variety of medications including steroids, antihistamines, HIV antivirals, benzodiazepines, antibiotics, antipsychotics, antidepressants, anticonvulsants, beta blockers, nonsteroidal anti-inflammatory drugs and more. For this reason, people should consult their doctors before starting a CBD regimen to see how it could impact any other medications they are already taking.

3. Have a Baby or Breastfeed

There’s a long list of things a woman shouldn’t consume while pregnant or nursing. Caffeine, sushi and soft cheeses are just a few of the things women are told to avoid and more foods are being added to the list everyday.

Many of the things on the new mom no-no list, like alcohol and junk food, aren’t generally considered good for your health regardless of whether you’re pregnant or not. However, other things outlawed for pregnant women, like fish and sprouts, are generally considered health foods under normal circumstances.

So while CBD has a number of health benefits, it’s best to avoid taking CBD oil while pregnant or nursing. That’s because there’s just not enough research on how CBD impacts a new baby.

Even CBD extracted from hemp can still contain trace amounts of THC which has been proven to have a negative impact on a gestating fetus. In September 2018, the American Academy of Pediatrics released a report looking at the effects of marijuana use during pregnancy and breastfeeding. According to the report, prenatal exposure to marijuana can lead to both short-term growth and long-term neurodevelopmental and behavioral consequences.

Additionally, there is research to suggest taking CBD oil could be harmful alone. A 2013 report in the American Journal of Obstetrics and Gynecology indicates that short-term exposure to CBD can enhance the permeability of the placental barrier, potentially placing the fetus at risk.