Always consult a physician or other qualified health provider regarding any questions you may have about a medical condition or health objectives. Not much is known about how CBD could interfere with other medications, but experts say it may interfere with how quickly the body breaks down a variety of prescription medications, which can increase side effects. It can also enhance the sedative properties of herbs and supplements that are known to cause sleepiness or drowsiness. Talk to your doctor or a pharmacist to confirm whether anything you take regularly could be affected by CBD.