Start here
THC and alcohol
Every recipe on this site is alcohol-free, and that is not squeamishness or a wellness position. It is the one place where the evidence is consistent enough that we are willing to be prescriptive.
What actually happens
Three findings, and they stack badly.
Alcohol raises your blood THC. A peer-reviewed review found significantly higher blood cannabinoid levels when alcohol was consumed before cannabis. The interaction runs both directions: cannabis also slows alcohol absorption. So you are not taking two things, you are taking two things that alter each other's pharmacokinetics.
The combined impairment is worse than either alone. The same review found the pair produced the greatest impairment across most cognitive and motor tasks, and that people who used both had roughly twice the odds of driving under the influence compared with alcohol-only users. The CDC puts it plainly: using both at once is likely to result in greater impairment than either one alone.
Tolerance does not carry over. This is the one most people get wrong. A controlled double-blind study of 21 heavy cannabis users, averaging nine years of use, found they had built real tolerance to some of THC's neurocognitive effects on their own. They had built no cross-tolerance to alcohol. Worse, alcohol potentiated THC's effects on divided-attention tasks, with control losses increasing two- to five-fold depending on the alcohol dose.
So the intuition "I handle weed fine, so I can handle a beer with it" is precisely backwards. Being an experienced THC user tells you nothing about how the combination will go, and the experiment has been run.
Where the research is genuinely unsettled
Honesty requires saying this: the literature is not clean on whether the interaction is strictly additive or genuinely synergistic. The same review contains passages describing it as "additive at most" and other passages describing potentiation. It disagrees with itself.
That is an open question about mechanism. It is not an open question about direction. Nobody is finding that the combination is safer than the parts.
The practical version
- Do not build a cocktail with both. That is why there are none here.
- If you have been drinking, the evening is a drinking evening. Leave the can.
- Watch the gap on the other side too. A drink at dinner and a 10mg can at ten o'clock is still a combination, because the THC has not finished with you.
- Do not drive on either, and do not drive on both at a length that would make you comfortable on one.
The bitter workaround
The reason people reach for alcohol in a THC drink is usually structure: they want the bitterness and the weight, not the ethanol. Non-alcoholic aperitifs solve that completely, and Ruby Bitter and The Two-Five are both built on that idea. You lose nothing you actually wanted.