Lean is a recreational drug mix that slows down your brain and body, producing a drowsy, euphoric high that users often describe as a heavy, relaxed sedation. It’s made by combining prescription cough syrup containing codeine and promethazine with soda and sometimes hard candy for sweetness. The codeine delivers an opioid high while the promethazine intensifies the sedation, and the combination carries serious risks including fatal overdose.
What’s Actually in Lean
The core ingredient is prescription-strength cough syrup. A standard formulation contains 10 mg of codeine and 6.25 mg of promethazine per teaspoon, along with 7% alcohol. Users pour large amounts of this syrup into a cup of soda (often Sprite or Mountain Dew) and dissolve Jolly Ranchers or similar candy into it, giving it a purple or pinkish color. That’s where the nicknames “purple drank,” “sizzurp,” and “dirty Sprite” come from.
The doses people use recreationally far exceed what a doctor would prescribe for a cough. A typical lean dose might involve several ounces of syrup, delivering many times the therapeutic amount of codeine in a single sitting. Because it tastes sweet and goes down easily, it’s deceptively simple to consume a dangerous quantity.
How It Affects Your Brain
Codeine is an opioid. Once in your body, your liver converts a portion of it into morphine. Both codeine and its morphine byproduct bind to opioid receptors in your brain, with a strong preference for the type of receptor (called the mu receptor) responsible for pain relief, euphoria, sedation, and the slowing of your breathing. When these receptors are activated, your brain cells become less excitable, pain signals get dampened, and your brain’s reward system releases a wave of pleasure.
Promethazine adds a second layer. It’s an antihistamine with strong sedative properties that amplifies the drowsiness and dreamlike feeling codeine produces. Together, the two drugs create a combined effect that’s more intense than either one alone. Users report feeling deeply relaxed, warm, and detached from their surroundings. Motor coordination drops, reaction time slows, and speech often becomes slurred.
Short-Term Effects on the Body
Beyond the mental high, lean triggers a cascade of physical changes. Opioids cause the pupils to constrict to tiny pinpoints, a telltale sign of use. Nausea and vomiting are common, especially at higher doses. Most opioids also trigger histamine release, which leads to itching, skin flushing, and sometimes hives.
The most dangerous short-term effect is respiratory depression. Codeine suppresses the part of your brainstem that monitors carbon dioxide levels and drives the urge to breathe. At recreational doses, breathing becomes shallow and slow. In overdose, breathing can drop to as few as 4 to 6 breaths per minute (normal is 12 to 20), and the reduced oxygen supply can cause you to lose consciousness. Opioids can also cause the airways to constrict, producing wheezing and frothy fluid in the lungs. Blood pressure can drop significantly due to the dilation of blood vessels throughout the body.
Why Overdose Happens Easily
Lean creates a perfect setup for accidental overdose. Because it’s sipped slowly from a cup, users often don’t realize how much codeine they’ve consumed until the effects hit hard. The promethazine intensifies the sedation, pushing someone closer to dangerous territory. And the 7% alcohol in the syrup adds yet another central nervous system depressant to the mix.
The classic signs of opioid overdose are sometimes called the “overdose triad”: pinpoint pupils, severely depressed breathing, and loss of consciousness. When breathing slows to a critical level, the brain and organs are starved of oxygen. This oxygen deprivation can cause permanent brain damage within minutes and death by respiratory arrest if not reversed. Mixing lean with additional alcohol, benzodiazepines, or other sedatives makes this outcome far more likely.
Long-Term Health Damage
Regular lean use takes a toll on multiple organ systems. The liver processes both codeine and alcohol, and chronic use can lead to liver damage over time. Kidney damage is another documented consequence, particularly when alcohol is part of the mix. Repeated episodes of oxygen deprivation from slowed breathing, even at sub-overdose levels, can cause lasting harm to the brain and other major organs.
There’s also a less obvious consequence: dental destruction. The combination of sugary soda, dissolved candy, and the carbonation in each cup creates an acidic, sugar-rich environment that erodes tooth enamel. Opioids also cause chronic dry mouth, which reduces the saliva your teeth need to fight off bacteria. For regular users, the result is accelerated tooth decay and gum disease.
Dependence and Withdrawal
Codeine is an opioid, and like all opioids, it builds physical dependence with repeated use. Your brain adapts to the constant presence of the drug by dialing down its own natural pain and mood regulation. When you stop, those adaptations are exposed, and withdrawal kicks in.
Opioid withdrawal from lean follows the same pattern as withdrawal from stronger opioids, though it may be somewhat less intense. Symptoms include muscle aches, runny nose, watery eyes, sweating, rapid heartbeat, goosebumps, dilated pupils, nausea, vomiting, diarrhea, and insomnia. Because codeine is a short-acting opioid, withdrawal typically begins within 12 to 18 hours after the last dose. The physical symptoms generally peak around days 2 to 3 and gradually improve over the first week, though sleep problems and mood changes can linger longer.
Promethazine doesn’t produce the same type of physical dependence as codeine, but stopping it abruptly after heavy use can worsen insomnia and agitation during the withdrawal period. The psychological pull of lean can also be strong, since the ritual of mixing and sipping the drink becomes closely tied to the high.
How Long It Stays in Your System
Codeine has a plasma half-life of about 3 hours, meaning half the drug is cleared from your blood roughly every 3 hours. Promethazine lingers longer, with a half-life of 10 to 14 hours. In practical terms, codeine and its byproducts are detectable in a standard urine drug test for 12 to 36 hours after use. Hair and blood tests have different detection windows, but urine screening is the most common method and will flag codeine as an opiate.
Because your liver converts codeine into morphine, a urine test after lean use will often show positive results for both codeine and morphine, which can be indistinguishable from other opiate use on a standard screening panel.