Vijaya and Your Other Medicines: What the Research Says About Interactions

When someone books a doctor consultation with us, one question does more work than any other: what else are you taking? It is not a formality. Cannabinoids are processed by the same set of liver enzymes that handle a large share of common prescription medicines, and when two things compete for the same enzyme, the levels of one or both can shift.

Kushiva makes cannabis leaf extract under India’s AYUSH framework. Whether it suits you is a question for your doctor.See the range

This is the least glamorous article on this site and probably the most useful. It explains, in plain language, how the interaction works, what the published research has actually measured, and which medicine groups are worth raising with your doctor before you start anything.

This article is educational and is not medical advice. Vijaya (cannabis leaf extract) is a prescription-regulated ingredient in India and should only be used under the guidance of a registered medical practitioner. Do not start, stop or change the dose of any prescribed medicine based on this article. If you take regular medication, speak to your doctor or pharmacist before considering any cannabis-based product.

Key Takeaways

• Cannabinoids are broken down by cytochrome P450 liver enzymes - the same family grapefruit juice famously interferes with.
• CBD has been shown to act on a wide range of these enzymes, including CYP3A4, 2C9, 2C19, 1A2, 2C8, 2B6 and 2E1.
• The best-documented example is clobazam, an epilepsy medicine: adding CBD raised levels of its active metabolite by three to five times.
• Blood thinners are the group that has caused real harm in published case reports, including an INR above therapeutic range and a required 30% warfarin dose reduction.
• The answer is almost never "do not take both". It is monitoring, timing and dose adjustment, decided by the person who prescribed your medicine.

Quick Answer

Yes, cannabis leaf extract can interact with common medicines. The mechanism is well established: cannabinoids inhibit liver enzymes that other drugs depend on to be cleared, which can push those drugs to higher levels than intended. The interaction is best documented for certain epilepsy medicines and for blood thinners. If you take any regular prescription - particularly a blood thinner, a sedative, an epilepsy medicine, or anything your doctor monitors with blood tests - this needs to be a conversation before you start, not after.

How the interaction works

Most medicines are broken down in the liver by a family of enzymes called cytochrome P450. Think of them as a small number of processing lanes. Many drugs queue for the same lane.

If something slows a lane down, everything queued behind it clears more slowly and builds up in the blood. That is why patients on certain medicines are told to avoid grapefruit juice - grapefruit inhibits one of these enzymes, and the medicine ends up stronger than the prescribed dose implies.

Cannabinoids do something similar. A 2019 review in the Journal of Clinical Medicine examining potential adverse events and interactions with medical and consumer CBD found activity across multiple P450 enzymes - CYP3A4, 2C9, 2C19, 1A2, 2C8, 2B6 and 2E1 - with inhibitory effects at clinically relevant concentrations on 2C8, 2C9, 2D6 and 2C19 (Journal of Clinical Medicine, 2019). Between them, those enzymes handle a very large share of what is in an average Indian medicine cabinet.

The same review noted something worth sitting with: across the clinical trial data, close to half of CBD users experienced an adverse event of some kind, with a general dose-response relationship. The commonly reported ones included raised liver enzymes, sedation and disturbed sleep. "Natural" and "no side effects" are not the same claim, and only one of them is true.

What has actually been measured

Two findings stand out because they were measured in patients rather than predicted from lab work.

Clobazam. In a study of children with hard-to-treat epilepsy, thirteen were taking clobazam when CBD was added. Because both are handled by the same P450 pathway, levels of norclobazam - clobazam's active metabolite - rose substantially, in some cases by three to five times. Clobazam doses had to be reduced in ten of the thirteen children (Epilepsia, 2015). This is the cleanest illustration of the mechanism in real patients.

Warfarin. This is the group where published cases describe genuine risk. A case report documented a patient starting CBD for epilepsy who ultimately needed a 30% reduction in warfarin dose to keep INR in range (Epilepsy & Behavior Case Reports, 2017). A separate review of warfarin and cannabis described a man on warfarin after a mechanical heart valve replacement presenting with an INR of 4.6 after cannabis use, and pointed to THC inhibiting the CYP2C9 pathway that clears warfarin (Basic & Clinical Pharmacology & Toxicology, 2019). A later systematic review looked specifically at anticoagulants and cannabinoids and reached the same practical conclusion - this combination needs monitoring, not assumption (Pharmacotherapy, 2023).

If you are on warfarin or acenocoumarol and your INR is checked regularly, that monitoring is exactly the tool that makes this manageable. It only works if your doctor knows to look.

Which groups are worth raising

This is not a list of things you cannot combine. It is a list of things to say out loud in the consultation.

• Blood thinners - warfarin and acenocoumarol most clearly, given the case reports and the shared CYP2C9 pathway.
• Epilepsy medicines - clobazam has the clearest published interaction, and several others in this class share the same pathways.
• Sedatives and sleep medicines - benzodiazepines, some antihistamines, and anything that makes you drowsy. Here the concern is additive as well as metabolic: two sedating things together sedate more.
• Anything with a narrow safe range that gets blood-tested - thyroid medication, certain heart medicines, immunosuppressants. If your doctor checks levels, that is a signal the margin is tight.
• Alcohol - not a prescription, but worth being honest about, for the same additive reason.

Two practical points that get missed. First, this is not only about prescriptions - herbal supplements and Ayurvedic preparations use the same liver pathways, and people routinely forget to mention them. Second, an interaction is not always a reason to stop. Very often the answer is a lower dose, spaced timing, or one extra blood test. That decision belongs to the doctor who prescribed the medicine, not to a website.

How this looked for one person: Rakash

The following is a first-person account. It is a composite, assembled from the kinds of things people describe during doctor-supervised consultations. The name and small details are invented. It is written to read like real life because the situations are real, but it is one person's experience, not evidence, and not medical advice.

I mentioned in another piece that I started this for anxiety and early-morning waking. The part I did not expect was how much of the first consultation was about my medicine cabinet.

I take thyroxine every morning and I had been started on a blood pressure tablet about eight months earlier. In my head neither of these counted. They were just things I did, like brushing my teeth. When the doctor asked what medication I was on, my honest first answer was "nothing really".

He pushed, which I am grateful for now and found slightly irritating at the time. It took two or three rounds of questions before I remembered the blood pressure tablet, and I only remembered the thyroxine because he asked specifically whether I took anything first thing on an empty stomach.

Nothing dramatic came of it. He did not tell me I could not proceed. He asked when my next thyroid blood test was due, said we would keep the extract dose low until after it, and told me to take the two several hours apart rather than together. That was the whole intervention. It cost nothing and took four minutes.

What has stayed with me is how close I came to not mentioning any of it. If I had bought something online without a consultation - which is what I was originally trying to do - nobody would ever have asked. I would not have known there was a question to answer.

— Rakash, 41, Bengaluru. Composite account, name invented.

What to bring to the consultation

Make it easy on yourself. Before you speak to a doctor about Vijaya, put together:

• Every prescription medicine, with the dose, including ones you consider routine.
• Anything you take without a prescription - painkillers, antacids, sleep aids, vitamins.
• Ayurvedic and herbal preparations. These count.
• Any blood test your doctor monitors regularly, and when the next one is due.
• Roughly how much alcohol you drink in a normal week, answered honestly.

A photograph of your medicine shelf is a perfectly good substitute for all of the above, and it is what we would rather see than a confident "nothing really".

None of this is meant to frighten anyone off. Most interactions are manageable and many are theoretical. But the difference between manageable and harmful is usually just whether someone knew to look - and that is decided in the first five minutes of a consultation, by what you remember to say.

This conversation is built into how Kushiva works: every Vijaya order goes through a prescription and medical-review step before dispatch, which is when your medicine list gets asked about. You can see the lab-tested Vijaya range and start with that review.