Mixing Weed With Other Drugs: What Happens to Your Body

Cannabis doesn't act in a vacuum: mixed with other drugs, it can amplify, blunt or reshape their effects. Combined with alcohol, stimulants, depressants, psychedelics or prescription meds, weed can intensify the high, raise the odds of nausea, anxiety or heavy sedation, and change how your liver processes certain medications.

Some combos may boost or blunt cannabis's therapeutic benefits, and many of them stack up the unwanted side effects. Knowing how cannabis plays with other substances is the foundation of using it more safely and with your eyes open.

How does weed interact with other recreational drugs?

Weed is one of the most widely used recreational substances on the planet, and plenty of people pair it with something else. That's where unexpected interactions show up. Here's what's known about the most common combos.

Weed and alcohol: the crossfade

Alcohol is one of the most popular drugs out there and the one most often mixed with weed. It's legal almost everywhere, but pairing it with cannabis can amplify some effects.

Studies indicate that alcohol can increase how much THC, weed's main psychoactive compound, gets into your bloodstream, which can mean a noticeably stronger high. The flip side: the combo is a classic recipe for nausea, dizziness and vomiting (the infamous “spins”). Booze and weed together also take a real toll on coordination and judgment.

Weed and amphetamines (including MDMA)

Some people also use cannabis alongside amphetamines and related drugs like MDMA. There are few clinical studies on this, but anecdotal reports suggest weed may take the edge off the comedown. That said, the combo could also feed into the addiction cycle, since the endocannabinoid system helps regulate addictive behavior.

Weed and cocaine

The weed-and-coke interaction is complicated. Because cannabis can act as either a depressant or a stimulant, mixing it with cocaine can intensify the bad parts, like anxiety and paranoia. Some research also suggests cannabis can increase how much cocaine your body absorbs, which would raise the risk of overdose.

Cannabis and codeine

Codeine is an opioid, and combined with weed it can deepen the sedative effect of both. Some people chase this combo for deep relaxation, but it can increase the risk of respiratory depression (dangerously slow, shallow breathing) and other adverse effects, especially at higher doses.

Weed and DMT

DMT is a powerful psychedelic, and some people pair it with weed to intensify the experience. Some users say smoking cannabis before DMT helps dial down the anxiety that can come with a psychedelic trip. Experiences vary a lot, though, and the combination can be overwhelming for some people.

Weed and ketamine

Ketamine is a dissociative anesthetic that's often taken with weed. Users report that cannabis boosts ketamine's dissociative effect, along with drowsiness and dizziness. Very few studies have looked at this combination, but most people describe a deeper sense of being disconnected from reality.

Cannabis and LSD

LSD and weed tend to work synergistically: cannabis can intensify acid's visual effects. Lots of people smoke toward the end of an LSD trip to bring the psychedelic effects back for a while. Others use it early on to calm their nerves or ease the nausea that can show up during the come-up.

Weed and magic mushrooms

Combining weed with psilocybin mushrooms is also common among psychedelic users. As with LSD, herb tends to amplify the hallucinogenic effects and can help settle the nausea shrooms sometimes cause. But this combo can be way too much for beginners, since the synergy between the two can push you into a deeper, more overwhelming trip.

Weed and salvia divinorum

Salvia is an intense psychedelic, and mixing it with weed can amplify its dissociative effects. Some people find the experience deeper and more enjoyable, but the mix can be hard to handle, especially if you've never tried salvia before.

Smoking weed and nitrous oxide (whippets)

Nitrous oxide, aka laughing gas, is a sedative that, combined with cannabis, produces a deep, mellow euphoria. At high doses of both, the combination can be strongly sedating, somewhat like ketamine, and that can be dangerous for some people.

How does weed interact with prescription medications?

Like many medications, cannabis is broken down by liver enzymes, specifically the cytochrome P450 family. These enzymes, including the CYP3A subfamily, are responsible for metabolizing up to 60% of the drugs people take.

If you're on prescription meds and you use cannabis, it's worth knowing how the two might interact. Below, we look at how THC and CBD, weed's two main compounds, interact with several common prescription drugs.

Blood sugar medications

One of the most common treatments for blood sugar control is metformin, prescribed to people with diabetes. Clinical evidence is thin, but it's been suggested that THC may reduce how well this medication works.

On the other hand, other cannabinoids may have some benefits for people with diabetes, such as helping stabilize blood sugar levels. Bottom line: if you're being treated for diabetes, talk to your doctor before using cannabis.

Blood pressure medications

Both THC and CBD have been studied for their effect on blood pressure. In some cases, THC can lower blood pressure while raising heart rate.

That can be a problem when combined with hypertension meds, because some patients may experience orthostatic hypotension, a sudden drop in blood pressure when standing up that causes dizziness, nausea or even fainting. If you use cannabis while taking blood pressure medication, keep a close eye on how you respond.

Blood thinners

There are signs that cannabis can interfere with anticoagulants and reduce their effectiveness. On the other hand, some compounds like CBD may slow down how these drugs are metabolized, which strengthens their effect.

That can lead to complications, including a higher risk of bleeding. More research is needed to fully understand this interaction, but anyone on blood thinners should check with their doctor before using cannabis.

Opioids

Opioids and weed don't appear to interact directly, but both are known for their pain-relieving effects. Recent studies suggest cannabis could complement opioid treatment, potentially allowing lower doses to manage pain.

Cannabis is also being explored as one possible tool against the opioid crisis, with some researchers looking at whether it could help lower addiction risk and overdose rates.

Sedatives

Some research suggests cannabis can change how well sedatives work. A study published in The Journal of the American Osteopathic Association found that patients who used cannabis regularly needed higher doses of sedatives like propofol before an endoscopy.

That points to cannabis possibly raising tolerance to certain sedatives, which can matter during medical procedures that require anesthesia. Heads up: tell your doctor or anesthesiologist if you use weed.

Antidepressants

How cannabis interacts with antidepressants depends on the type of medication and on the person. Some people report that weed lifts their mood and eases depression symptoms, while others find it makes anxiety and depressive episodes worse.

Because the effects are so individual, anyone taking antidepressants should talk to their doctor before adding cannabis to the mix.

Antibiotics

THC and CBD can inhibit cytochrome P450 enzymes, which are responsible for breaking down certain antibiotics. That could slow how the antibiotics are metabolized and raise the risk of side effects like nausea, vomiting and stomach pain.

Research on this interaction is limited, and no serious side effects have been reported in people using antibiotics and cannabis at the same time. Still, it's always a good idea to check with a health professional before combining the two.