CBD Medication Interactions

Last updated: October 30, 2026. Medically reviewed by Dr. Jason Winkelmann, ND, DC. This guide is for general information and does not replace advice from your doctor or pharmacist.

Key Points

• CBD can interact with some medications. Your liver uses the same enzymes to break down CBD and many common prescription drugs, so taking them together can change how much of a medication stays in your system.
• The grapefruit warning is a useful rule of thumb. If your medication's label says to avoid grapefruit, ask your doctor or pharmacist before using CBD.
• Blood thinners deserve the most attention. Warfarin is the medication most often linked to CBD interactions in published case reports.
• Other medications to ask about include statins, some blood pressure medications, sedatives and sleep aids, some antidepressants, seizure medications, and transplant drugs.
• Oils and gummies matter more than topicals. CBD you swallow or hold under your tongue reaches your bloodstream in much larger amounts than CBD from a salve or bath bomb.
• Talk to your doctor or pharmacist first if you take any prescription medication, and bring the product's label and lab report with you.

Table of Contents

• How Does CBD Interact with Medications?
• The Grapefruit Rule of Thumb
• CBD and Blood Thinners
• CBD and Statins
• CBD and Blood Pressure Medication
• CBD with Sleep Aids, Sedatives, Gabapentin and Alcohol
• CBD and Antidepressants
• Other Medications to Ask About
• CBD and Your Liver
• Topical vs. Oral CBD: Does It Make a Difference?
• When to Talk to Your Doctor or Pharmacist
• CBD and Medication FAQ
• Sources

How Does CBD Interact with Medications?

Most medications are broken down in the liver by a family of enzymes called cytochrome P450 (CYP450). Two of the busiest are CYP3A4 and CYP2C19, and together they process a large share of prescription drugs.

CBD is processed by those same enzymes, and it can also slow them down. When that happens, a medication may be cleared more slowly than usual, so more of it stays in your bloodstream for longer. With some medications, that makes little difference. With others, especially those where the right amount has to be kept within a narrow range, it can matter a lot.

The prescribing information for Epidiolex, the FDA-approved prescription CBD medicine, lists several of these interactions. It's the most detailed official source on how CBD affects other drugs. Keep in mind that Epidiolex is taken in much larger amounts than most over-the-counter CBD products, so the effects at everyday amounts are usually smaller and less well studied.

The Grapefruit Rule of Thumb

Grapefruit slows down CYP3A4, the same enzyme CBD affects. That's why many medication labels carry a "grapefruit warning."

Pharmacists often suggest using that warning as a quick check: if your medication says to avoid grapefruit, it's a good idea to ask about CBD before you start. It's not a perfect test, because CBD affects other enzymes too, but it's a simple place to begin.

CBD and Blood Thinners

Warfarin (Coumadin) is the medication most often linked to CBD interactions. It's broken down partly by CYP2C9, an enzyme CBD can slow. In a published 2018 case report, a patient taking warfarin had a sharp rise in INR, the blood test that measures how long blood takes to clot, after starting prescription CBD. The doctors had to lower the warfarin to bring the INR back into range.

Warfarin already needs regular blood tests because the gap between too little and too much is small. If you take warfarin and want to try CBD, tell the doctor or clinic that manages your INR before you start, so they can check your levels more closely.

Newer blood thinners such as apixaban (Eliquis) and rivaroxaban (Xarelto) are partly processed by CYP3A4. There's less research on CBD with these drugs, so ask your pharmacist before combining them.

CBD and Statins

Several statins, including atorvastatin (Lipitor), simvastatin (Zocor) and lovastatin, are processed by CYP3A4. In theory, CBD could raise the amount of these statins in your blood, which is the same reason they carry grapefruit warnings. Other statins, such as rosuvastatin (Crestor) and pravastatin, rely much less on CYP3A4.

Direct studies of CBD with statins are limited. If you take a statin, let your doctor know you're considering CBD, and mention any new muscle soreness or weakness after you start.

CBD and Blood Pressure Medication

Many blood pressure medications, including calcium channel blockers such as amlodipine and nifedipine, are processed by CYP3A4. CBD may also lower blood pressure slightly on its own: in a small 2017 study, a single large amount of CBD lowered resting blood pressure in healthy volunteers.

Together, those two effects could add up. If you take blood pressure medication, ask your doctor before using CBD, and watch for lightheadedness or dizziness, especially when you stand up.

CBD with Sleep Aids, Sedatives, Gabapentin and Alcohol

The Epidiolex label warns that combining CBD with other substances that cause drowsiness, including alcohol, can increase sleepiness. That includes prescription sleep medications, benzodiazepines such as diazepam (Valium) and alprazolam (Xanax), prescription opioids, and some antihistamines.

The label also notes that CBD raises blood levels of diazepam, because both rely on CYP2C19. If you take any of these, ask your doctor first, and don't drive until you know how the combination affects you.

Gabapentin (Neurontin) works a little differently. It isn't broken down by the liver at all; your kidneys clear it unchanged. So CBD is unlikely to raise gabapentin levels the way it can with the medications above. The concern is that both can make you drowsy or dizzy, and those effects can add up. The FDA has also warned that gabapentin combined with other drowsiness-causing substances can slow breathing in some people, especially older adults and people with lung conditions. The same goes for pregabalin (Lyrica). If you take either one, ask your doctor before adding CBD, start with a small amount, and see how you feel before driving.

CBD and Antidepressants

Several common antidepressants, including sertraline (Zoloft), citalopram (Celexa) and escitalopram (Lexapro), are processed partly by CYP2C19, which CBD can slow. That could raise the amount of the antidepressant in your system.

Research on CBD with these medications is still limited. Don't change or stop an antidepressant on your own. Talk to your prescriber before adding CBD, and let them know if you notice new side effects.

Other Medications to Ask About

The Epidiolex prescribing information also lists interactions with:

• Seizure medications, including clobazam, valproate and phenytoin. Taking CBD with valproate increased liver enzyme levels in clinical trials.
• Transplant and immune-suppressing drugs such as tacrolimus, sirolimus and everolimus, which need careful blood-level monitoring.
• Digoxin, a heart medication.
• Caffeine and theophylline, because CBD slightly slows CYP1A2, the enzyme that clears them.

CBD and Your Liver

Your liver does most of the work of breaking down CBD, so it's the organ researchers watch most closely. The Epidiolex label warns that CBD can raise liver enzymes (ALT and AST), a blood-test sign that the liver is under strain. The risk was higher at larger amounts and in people also taking valproate or clobazam.

A 2025 study run by FDA researchers looked at healthy adults taking about 400 mg of CBD a day for four weeks, an amount the researchers chose to reflect what some consumers take. About 1 in 18 developed elevated liver enzymes, compared with none of the people taking a placebo. Their levels returned to normal within one to two weeks after they stopped.

That doesn't mean CBD harms most people's livers, but it's worth keeping in mind:

• Tell your doctor you use CBD, especially if you have liver problems, drink alcohol regularly, or take other medications that are hard on the liver. A simple blood test can check your liver enzymes.
• Start with a small amount rather than a large one.
• Stop and call your doctor if you notice yellowing of your skin or eyes, dark urine, unusual tiredness, or discomfort in the upper right side of your belly.

Topical vs. Oral CBD: Does It Make a Difference?

Yes. How you use CBD changes how much of it reaches your bloodstream, and that's where interactions happen.

• Oils, tinctures and gummies are swallowed or held under the tongue, so the CBD passes through your bloodstream and liver. These are the forms most likely to interact with medications.
• Salves, creams, lip balms and bath bombs are applied to the skin. Most of the CBD stays in the skin, but small amounts can still get through. A 2022 study of a hemp cream found low but measurable CBD in participants' blood several hours after use.

So topicals are a lower-exposure option, but they're not zero. If you take a medication with a narrow safe range, like warfarin, mention any CBD product you use, including topicals. Shop our CBD topicals or CBD oil tinctures.

When to Talk to Your Doctor or Pharmacist

Check with a professional before using CBD if you:

• Take any prescription medication, especially one with a grapefruit warning
• Take a blood thinner, seizure medication or transplant medication
• Have liver problems
• Are pregnant or breastfeeding
• Have a procedure or surgery coming up

Your pharmacist is often the quickest person to ask. Bring the product with you, or pull up its lab report (certificate of analysis), so they can see exactly what it contains. Every Leanna Organics product ships with a QR code linking to its third-party lab results.

If you get the go-ahead, start with a small amount, keep using it at the same time each day, and let your doctor know about any changes you notice. Choosing a THC-free product made with CBD isolate also keeps things simpler, because there's one cannabinoid to consider instead of several.

CBD and Medication FAQ

Can CBD interact with medications?

Yes. CBD is broken down by the same liver enzymes as many prescription drugs, and it can slow those enzymes. That can raise the amount of some medications in your blood. Ask your doctor or pharmacist before using CBD if you take any prescription medication.

Is it safe to take CBD with blood thinners?

Not without your doctor's input. Warfarin is the medication most often linked to CBD interactions, and published reports show CBD can raise INR levels. If you take a blood thinner, talk to the doctor who manages it before using CBD.

Can I take CBD with gabapentin?

Ask your doctor first. Gabapentin is cleared by the kidneys rather than the liver, so CBD is unlikely to change how much of it is in your blood. Both can cause drowsiness and dizziness, though, and those effects can add up, so start small and don't drive until you know how the combination affects you.

Is CBD bad for your liver?

For most people, not at typical amounts, but it can raise liver enzymes in some people. In a 2025 FDA study, about 1 in 18 healthy adults taking 400 mg a day had elevated enzymes, which returned to normal after they stopped. If you have liver problems or drink regularly, talk to your doctor before using CBD.

Which medications have a grapefruit warning?

Common examples include some statins, some blood pressure medications, certain sedatives and some transplant drugs. Check your medication's label or ask your pharmacist. A grapefruit warning is a good sign to ask about CBD too.

Do CBD topicals interact with medications?

Much less CBD reaches your bloodstream from a salve, cream or bath bomb than from an oil or gummy. Small amounts can still be absorbed, though, so mention topicals to your doctor if you take a medication like warfarin.

How long should I wait between CBD and my medication?

Spacing them a few hours apart doesn't reliably prevent an interaction, because CBD can affect liver enzymes for longer than that. Ask your pharmacist what makes sense for your specific medication.

Can I drink alcohol while using CBD?

The Epidiolex label notes that alcohol combined with CBD can increase sleepiness. Go easy, and don't drive until you know how the combination affects you.

Related Articles

• Hemp Ban 2026: What the New Federal Hemp Law Means for CBD Shoppers
• CBD vs. THC
• Full Spectrum vs. CBD Isolate
• Our Third-Party Lab Results

Sources

• FDA: Epidiolex (cannabidiol) Prescribing Information, Section 7: Drug Interactions
• FDA: What You Need to Know About Products Containing Cannabis or CBD
• FDA Drug Safety Communication (2019): Serious Breathing Problems with Gabapentin and Pregabalin
• Florian et al., JAMA Internal Medicine (2025): Cannabidiol and Liver Enzyme Level Elevations in Healthy Adults
• Harvard Health Publishing: CBD and Other Medications, Proceed with Caution
• Grayson et al., Epilepsy & Behavior Case Reports (2018): An Interaction Between Warfarin and Cannabidiol
• Jadoon et al., JCI Insight (2017): A Single Dose of Cannabidiol Reduces Blood Pressure in Healthy Volunteers
• Advances in Therapy (2022): Pharmacokinetic Study of a Topical Hemp Extract Product

Scott Mollenkopf

Co-founder, Leanna Organics

Scott co-founded Leanna Organics with his wife, Tracy, in 2018, and runs the technical, marketing and education side of the business from their shop in Westminster, Colorado. Since 2018 he's answered customers' CBD questions in the store and at Front Range farmers markets, and writes about CBD, hemp and natural wellness.

This article was researched and drafted with the help of AI, then reviewed and edited by Scott. Read more about Scott

Medically reviewed by

Dr. Jason Winkelmann, ND, DC

Reviewed October 30, 2026. Read more about Dr. Winkelmann

This article is for general information only and is not medical advice. Always talk to your doctor or pharmacist before combining CBD with any medication. The FDA has not evaluated these statements. Our products are not intended to diagnose, treat, cure, or prevent any disease.