What Is Lean? The Codeine Drink, Its Effects, and Why It Is More Dangerous Than It Looks

What is in it

The base is prescription cough syrup containing codeine, an opioid, and promethazine, a sedating antihistamine. It is poured into a soft drink, usually Sprite or a fruit soda, and often sweetened further with hard candy, which gives it the purple color and the sticky sweetness that made it famous. A “double cup,” two foam cups nested to keep it cold, is the recognizable signature.

Two things about the ingredients matter more than the recipe. Codeine is converted by the liver into morphine, and how fast that happens varies genetically: some people are “ultra-rapid metabolizers” who get a far larger morphine dose from the same syrup. And promethazine is not a filler. It deepens the sedation and the breathing suppression, which is why the combination is more dangerous than codeine alone.

Where it comes from

Codeine cough syrup is a controlled substance in the United States and has been prescription-only for decades; in 2018 the FDA restricted opioid cough and cold medicines to adults. Lean is made from syrup that has been diverted from pharmacies, prescribed to someone else, or, increasingly, counterfeited. Homemade versions sold as lean have been found to contain no codeine at all, or something else entirely, including fentanyl. Like every street drug, the label is a claim, not a fact.

What it does

Lean produces a slow, heavy, dreamy sedation, the “lean” in the name, along with euphoria and a loose, unhurried feeling. Effects begin within thirty to sixty minutes and last for hours, depending on how much syrup went into the cup, which no one measuring by the splash actually knows. Side effects during use include nausea, constipation, itching, dizziness, slurred speech, and, at higher doses, slow breathing and loss of consciousness.

Why it is more dangerous than it looks

• Breathing. Codeine and promethazine both suppress it. Add alcohol or benzodiazepines, and the effect compounds. Several high-profile deaths tied to lean involved exactly that mix.
• Dosing by the cup. A prescription dose of codeine syrup is measured in teaspoons. A cup of lean can hold many times that, and no two cups match.
• Genetics. Ultra-rapid metabolizers can overdose on an amount that a friend tolerated. The FDA’s boxed warning on codeine rests on exactly this.
• Counterfeits. Syrup of unknown origin can contain anything.
• Seizures. Very high doses of promethazine and codeine have been associated with seizures.
• Everything sugar does. Daily cups of soda and candy damage teeth and add weight, the visible version being the so-called lean gut.

Types of lean

The name covers several different drinks, and the difference matters medically.

• Codeine and promethazine syrup. The original and still the reference: prescription cough syrup with an opioid and a sedating antihistamine, poured into soda. Purple from the syrup, hence purple drank.
• Hydrocodone-based syrup. Some prescription cough syrups contain hydrocodone, a stronger opioid, with an antihistamine. Same drink, higher opioid dose per pour.
• Dextromethorphan “lean.” Made from over-the-counter DXM cough medicine. Not an opioid, but a dissociative that at high doses causes confusion, agitation, and its own emergency-room visits. Often sold or described as lean to people who cannot get the real thing.
• “Dirty” or spiked cups. Lean with something added: alcohol, a crushed benzodiazepine, or an unknown syrup of street origin that may contain fentanyl.

From the outside all four look like a purple cup. From the inside they are an opioid, a stronger opioid, a dissociative, and a mystery. Anyone treating an overdose or a withdrawal needs to know which one.

What “a line of lean” means

A “line” is a pour measured against the printed lines inside a foam cup. It is the closest thing lean has to a dose, and it is not close: syrup concentrations vary, pours vary, a prescription dose of the same syrup is measured in teaspoons, and the person pouring is usually already sedated.

Is lean legal?

Codeine and promethazine cough syrup is a Schedule V controlled substance, legal only with a prescription and only for the person it was prescribed to. Possessing it without one, or selling it, is a crime in New Jersey as it is everywhere in the United States. Hydrocodone syrups are Schedule II, with tighter rules. Dextromethorphan is legal over the counter, though New Jersey bars its sale to anyone under 18 (N.J.S.A. 2A:170-51.7). Mixing a legal syrup into soda does not change what schedule it is; the drink is exactly as controlled as the syrup in it.

Is lean addictive?

Yes, in the ordinary way opioids are. Regular use produces tolerance, so more syrup is needed for the same effect, and then physical dependence, so stopping produces withdrawal. Because lean is culturally framed as a drink rather than a drug, people often do not recognize that they are opioid-dependent until they try to stop. And when syrup gets hard or expensive to find, the path to pills or heroin is short and well worn.

Withdrawal

Codeine withdrawal follows the opioid pattern: aches, sweating, runny nose, yawning, stomach cramps, diarrhea, anxiety, and insomnia, usually beginning within a day of the last cup and peaking over the next two or three. It is rarely life-threatening on its own. The complication is that people who drink lean often also use alcohol or benzodiazepines, and those withdrawals can be dangerous. A clinician needs to know everything being used.

Treatment in New Jersey

For regular heavy use, buprenorphine makes withdrawal far more tolerable and cuts the risk of moving to stronger opioids; any New Jersey prescriber whose DEA registration covers Schedule III can start it. Our opioid detox guide explains when a supervised setting makes sense. Periscope Behavioral Health, which publishes this site, at (888) 313-3583 connects you to a care navigator who helps with placement, NJ FamilyCare and uninsured callers included. Keep naloxone in the house if anyone there drinks lean.