How Cannabis Medicine Actually Works in Your Body

Cannabis medicine works because your body already has a signalling network built for the same kind of molecules. THC, CBD and other cannabinoids from the plant attach to receptors in that network, or change how it behaves, and the network in turn helps regulate pain, mood, sleep, appetite and inflammation. How strongly you feel any of it depends on the compound, the dose, and the route it takes into your bloodstream.

Most explanations stop at the phrase "it interacts with the endocannabinoid system." That is true, and it explains very little. This article follows the path a dose actually takes, from the first receptor it meets to the liver that breaks it down. It then looks at how Ayurveda's traditional handling of Vijaya, the Sanskrit name for the cannabis plant, lines up with what pharmacology now tells us. We are an Ayurvedic manufacturer and clinic team that works with Vijaya, so we also say plainly where the evidence is thin.

What is the endocannabinoid system?

The endocannabinoid system, or ECS, is a communication network found in nearly every tissue of the body. It has three working parts: receptors, the molecules that switch them on, and the enzymes that clear those molecules away.

The two main receptors are CB1 and CB2. CB1 is densest in the brain and spinal cord, where it sits on nerve endings and turns down the release of other neurotransmitters. CB2 is found mostly on immune cells and peripheral tissues, and is tied to the control of inflammation. Both types also appear along the gut wall, which is one reason cannabinoids are studied in digestive conditions.

The molecules that activate these receptors are made by your own body. The best known is anandamide, named by the researchers who isolated it in 1992 after the Sanskrit word ananda, meaning bliss. The other is 2-AG. Unlike most neurotransmitters they are not stored in advance. Cells build them on demand from fats in their membranes and send them backwards across the synapse to tell the sending nerve to ease off. Enzymes then break them down quickly: FAAH for anandamide, MAGL for 2-AG.

That makes the ECS something like a dimmer switch for other signals, and it explains why one system touches so many functions: pain, mood, sleep, appetite, memory and immune response. When a plant cannabinoid arrives, it is pushing on a dimmer that was already there.

How do THC and CBD act differently in the body?

THC (tetrahydrocannabinol) fits directly into CB1 and CB2 and activates them, though less completely than your own anandamide does. Because CB1 is so dense in the brain, THC is the compound responsible for the "high." It is also behind much of cannabis's pain relief, appetite stimulation and muscle relaxation.

CBD (cannabidiol) barely binds to those receptor sites. It works around them. Laboratory studies show it can change the shape of the CB1 receptor so that THC has less effect, activate serotonin 1A receptors, stimulate TRPV1 channels (involved in pain and heat sensing), and slow the breakdown of anandamide. This is why CBD does not intoxicate, and why it may soften some of THC's less pleasant effects, although the human evidence for that last point is mixed.

The plant also carries well over a hundred other cannabinoids and a large number of terpenes. The "entourage effect," the idea that they work better together than alone, is popular and plausible. It has not been firmly shown in human trials, so we treat it as a hypothesis rather than a fact.

What happens after you swallow it?

Cannabinoids dissolve in fat, and that shapes almost everything about how they behave. Taken by mouth, they are absorbed in the small intestine and travel through the portal vein straight to the liver before reaching the rest of the body. That first pass through the liver removes a large share. Oral bioavailability of THC and CBD is low and varies a lot between people, with estimates running from roughly 5 to 20 percent.

The liver also changes the molecule. THC is converted into 11-hydroxy-THC, which crosses into the brain easily and is at least as potent as THC itself. This is why a swallowed dose can feel stronger and last longer than the same amount inhaled. The liver then converts it further into an inactive form, THC-COOH, which leaves the body in urine and stool.

Fat matters on the way in as well. In the trials behind the US FDA label for the CBD drug Epidiolex, taking it with a high-fat meal raised blood levels roughly four to five times. Whether you take a dose on an empty stomach or with food can change the effect more than a small change in the dose itself.

These are typical ranges from the pharmacology literature. Individual results differ.

Because cannabinoids settle into body fat and leave slowly, elimination takes time. The half-life of CBD after oral doses runs from about a day to well over two. THC metabolites can stay detectable in urine for days, and for weeks in people who use it daily.

Why does the same dose affect two people differently?

A few things stack up. Variants in the CYP2C9 gene slow the clearance of THC in some people. Body composition, liver function and what you ate all change absorption and breakdown. Tolerance matters too: in a 2012 PET imaging study of daily cannabis smokers, CB1 receptor availability in the brain was reduced, and it recovered after about four weeks without use.

Dose itself behaves oddly. THC's effect on anxiety can run in opposite directions at low and high doses, a pattern pharmacologists call biphasic. An amount that settles one person can unsettle another.

That is the practical reason a physician begins with a small amount, adjusts slowly, and asks about your other medicines before anything else.

What does the evidence actually show?

Uneven is the honest word. A 2017 review by the US National Academies of Sciences, Engineering, and Medicine found substantial evidence that cannabinoids help with chronic pain in adults, that oral cannabinoids help prevent chemotherapy-induced nausea, and that they improve patient-reported muscle spasticity in multiple sclerosis. For several other conditions people commonly ask about, the committee rated the evidence as limited or insufficient.

The clearest single result is for purified CBD in certain childhood epilepsies. After randomised controlled trials, the FDA approved Epidiolex in 2018 for seizures in Lennox-Gastaut and Dravet syndromes.

Most of this research tested purified or standardised products, not whole-leaf preparations. Trials of traditional Ayurvedic formulations containing Vijaya are far fewer. It is worth saying out loud, because that gap sits between what a laboratory shows about one molecule and what a ghrita or churna does in a real person.

Where does Ayurveda's way of preparing Vijaya fit?

Ayurvedic texts do not describe receptors, but they do describe method. Vijaya is treated as a potent herb that must be purified (shodhana) before use, commonly by processing the leaves with cow's milk or ghee. It appears in classical formulations for weak digestion, loose stools and chronic bowel complaints (grahani), and for sleeplessness.

Two features of that tradition line up with the pharmacology above. The first is the carrier. Ayurveda pairs Vijaya with ghee and oils (sneha) in preparations such as Vijaya Ghrita, and a fat carrier is also what modern pharmacology would suggest for a group of fat-soluble compounds. We are not claiming the classical authors understood the mechanism. The point is that practice and chemistry end up pointing the same way.

The second is combination. Classical recipes rarely use Vijaya alone. Jatiphaladi Churna, for example, pairs it with other herbs chosen to support digestion and balance its action. So the effect of a traditional formulation is not the effect of one molecule, and it should not be read as if it were.

Vedi Herbals is made by HempCann Solutions Pvt. Ltd., with its head office in Bhubaneswar. Our range includes Vijaya-infused Ayurvedic medicines (Cannapain, Cannaflam and Cannaron), classical formulations such as Vijaya Ghrita, Jatiphaladi Churna and Vijaya Churna, and a clinic, Vedi Wellness Ayurveda and Panchakarma centre, in Bengaluru.

Who should be careful?

The common short-term effects are dry mouth, dizziness, drowsiness and a faster heartbeat. Higher THC doses can bring anxiety or paranoia. THC also impairs driving, so avoid it until you know how a dose affects you.

Get specific medical advice first if you are pregnant or breastfeeding, have a personal or family history of psychosis, have serious heart or liver disease, or are a teenager or young adult, since the developing brain is more sensitive to THC.

Interactions deserve more attention than they usually get. CBD slows the liver enzymes CYP2C19 and CYP3A4, the same enzymes that clear many prescription drugs. Documented examples include raised levels of the anti-epileptic clobazam and a higher INR in people taking warfarin. In trials, combining CBD with valproate was associated with raised liver enzymes. Cannabinoids also add to the effect of alcohol, sedatives and opioids. Do not stop or change a prescribed medicine on your own, especially anti-epileptics, blood thinners and antidepressants.

On the legal side, India's Narcotic Drugs and Psychotropic Substances Act, 1985 controls cannabis resin and flowering tops, but its definition leaves out the leaves and seeds. Leaf-based Ayurvedic medicines are made under licence in that space. State rules differ, so check the manufacturer's licence details and batch information on any product you buy.

Talk to a physician before you start

Because the response depends so much on the compound, the route, food and your other medicines, the useful first step is a conversation, not a product. You can book an online consultation with a Vedi doctor, read about our doctors, or visit Vedi Wellness in Bengaluru for an in-person consultation and Panchakarma. If you want to see how our formulations are positioned, they are listed in the cannabis-infused medicine collection.

Frequently asked questions

How long does cannabis medicine take to work?

It depends on the route. Swallowed forms usually take 30 to 120 minutes and last 6 to 8 hours. Oils held under the tongue tend to act faster, often within 15 to 45 minutes. Inhaled forms act within minutes and fade in a few hours. Food and individual metabolism move these numbers.

Does CBD make you high?

No. CBD does not activate CB1 receptors the way THC does, so it is not intoxicating. It can still cause drowsiness or digestive upset in some people, and products that contain both CBD and THC can produce a high if the THC dose is large enough.

Do I have an endocannabinoid system if I have never used cannabis?

Yes. Everyone does. Your body makes its own cannabinoids, anandamide and 2-AG, and the system is active whether or not you ever take a plant cannabinoid.

How long do cannabinoids stay in the body?

Longer than the effects last. They dissolve in fat and are released slowly, so CBD's half-life runs from about a day to over two days, and THC metabolites can remain detectable in urine for days to weeks, depending on how often it is used.

Can cannabis medicine interact with my other medicines?

Yes. CBD affects liver enzymes that process many common drugs, and cannabinoids add to the sedating effect of alcohol and sleep or anxiety medicines. Tell your doctor about everything you take before starting.