Lean is a recreational drink made by mixing prescription cough syrup containing codeine and promethazine into soda, with candy added for sweetness. The mixture circulates under the street names purple drank, sizzurp, dirty sprite, and purple stuff. Its active ingredient, codeine, is an opioid, which makes lean a form of opioid misuse with opioid consequences: sedation, dependence, and dose-related respiratory depression.
The federal record on the source medication is explicit. Promethazine-codeine cough syrup is a Schedule V controlled substance, and in January 2018 the U.S. Food and Drug Administration required labeling changes limiting prescription cough medicines containing codeine or hydrocodone to adults 18 and older, because the risks of misuse, abuse, addiction, overdose, death, and slowed or difficult breathing outweigh the benefits in anyone younger.
Understanding lean starts with what is in the cup.
What Is Lean?
Lean is a mixture of prescription codeine-promethazine cough syrup and soft drink, consumed for the opioid's euphoric and sedative effects. The nickname describes the result: codeine's sedation impairs balance and posture until a person leans.
Lean is not a distinct drug; it is a delivery format for diverted prescription opioids. The syrup requires a prescription, and every path to a cup of lean runs through diversion: leftover prescriptions, theft, or illegal purchase. The soda and candy do one job, masking the syrup's medicinal taste, which lets a person swallow far more codeine than a therapeutic dose without the taste stopping them. What that codeine does travels with its pharmacology.
What Drugs Are in Lean?
Lean contains 2 active drugs: codeine, an opioid that suppresses cough and produces euphoria, and promethazine, a sedating phenothiazine antihistamine. Both depress the central nervous system, and the combination depresses it more than either alone.
The following table defines both ingredients and their roles, drawn from the FDA-approved prescribing label for promethazine-codeine syrup, revised November 2024.
| Ingredient | Drug class | Effect in lean | Documented risk |
| Codeine | Opioid agonist, converted to morphine in the liver by the CYP2D6 enzyme | Euphoria, sedation, cough suppression | Respiratory depression, tolerance, opioid use disorder, overdose |
| Promethazine | Phenothiazine antihistamine | Sedation, amplified drowsiness | Additive central nervous system depression alongside codeine |
| Soda and candy | Not drugs | Mask the syrup's taste | Enable swallowing supratherapeutic codeine amounts |
The prescribing label instructs that benzodiazepines, other central-nervous-system depressants and alcohol be avoided with promethazine-codeine, an instruction lean culture inverts by pairing the drink with alcohol and other sedatives. That pairing is where the effects turn dangerous.
What Are the Effects of Lean?
Lean produces euphoria, heavy sedation, slowed reaction time, impaired coordination, and constricted pupils, the standard opioid effect profile, lasting hours rather than minutes. Promethazine deepens the drowsiness beyond what codeine alone produces.
The effect that kills is respiratory depression. Codeine slows the brainstem's drive to breathe, and the depression scales with the amount swallowed. A cup of lean contains an unmeasured, taste-masked syrup dose, so the person drinking it does not know their codeine intake even approximately. Adding alcohol or a benzodiazepine multiplies the suppression: the prescribing label names sedatives and tranquilizers as drugs that enhance impairment when combined with promethazine-codeine. Slowed, shallow, or stopped breathing after lean use is an opioid overdose. Call 911 immediately; naloxone reverses opioid overdose. Repeated exposure adds the second opioid consequence: addiction.
Is Lean Addictive?
Yes, lean is addictive, because codeine is an opioid and repeated opioid exposure produces tolerance, physical dependence, and opioid use disorder. The 2018 FDA labeling action added misuse, abuse, addiction, overdose, and death to the Boxed Warning, the agency's most prominent warning class, on every prescription codeine cough medicine label.
Tolerance drives the escalation pattern specific to lean: the sweetened format makes drinking progressively larger syrup volumes easy, and a person who started with weekend use moves toward daily use to hold off withdrawal symptoms such as anxiety, sweating, muscle aches, and insomnia. The arc matches the broader course of drug addiction, compressed by an opioid's fast tolerance curve. Genetics adds a hidden multiplier. The prescribing label warns that people with certain CYP2D6 variants are ultra-rapid metabolizers who convert codeine to morphine unusually fast, reaching overdose-level morphine concentrations from amounts others tolerate; the label estimates the prevalence of that phenotype at 1 to 10 percent for Whites, 3 to 4 percent for Blacks, 1 to 2 percent for East Asians, and above 10 percent in certain ethnic groups. The same opioid classification answers the question of who lean's marketing reached.
Why Did the FDA Restrict Codeine Cough Syrup for Minors?
The FDA restricted codeine cough medicines because an extensive review and an outside expert panel both determined the risks of slowed or difficult breathing, misuse, abuse, addiction, overdose, and death outweigh the benefits in patients younger than 18. The January 2018 action removed every pediatric indication from prescription opioid cough and cold medicines.
The action closed a supply route that lean culture had normalized for teenagers through music and social media, and the FDA's Drug Safety Communication records the reasoning. It also states the clinical bottom line for parents in regulatory language: no cough justifies giving an adolescent an opioid, and the FDA notes that cough from a common cold is self-limited and generally does not need treatment. A teenager mixing lean is not treating a cough; the teenager is drinking diverted opioids, and the response that fits is the response to opioid misuse: assessment and treatment.
What Is the Treatment for Lean Addiction?
Treatment for lean addiction is treatment for opioid use disorder: medically supervised stabilization, medication for opioid use disorder where indicated, and structured behavioral therapy. Codeine dependence responds to the same evidence-based protocol as dependence on any other opioid.
Structured outpatient care fits the profile of most people using lean, who are early in an opioid trajectory and still attached to school or work. Valley Spring Recovery Center delivers opioid addiction treatment in Norwood, New Jersey across three outpatient levels of care, with medication options prescribed by an on-staff psychiatrist and process groups capped under 10 people. The broader clinical context for codeine dependence lives in the opioid use disorder overview, and the same 2018 restriction covers hydrocodone addiction, the other opioid in prescription cough medicines. A free, confidential phone assessment at (855) 924-5320 establishes where a specific person's use falls and which level of care fits it, at any hour.
What Are the Most Common Questions About Lean?
The 6 questions below cover legality, overdose, terminology, and teen-safety facts people search most about lean.
Is Lean Illegal?
Possessing codeine-promethazine syrup without a prescription is illegal. The syrup is a Schedule V controlled substance, and distributing it outside a valid prescription is a federal crime under 21 U.S.C. 841 and a New Jersey crime under N.J.S.A. 2C:35-5.
Can You Overdose on Lean?
Yes. Codeine depresses breathing in proportion to the amount swallowed, and lean hides that amount behind soda and candy. Slow, shallow, or stopped breathing, pinpoint pupils, and unresponsiveness are overdose signs; call 911 and give naloxone.
Is Lean the Same as Purple Drank and Sizzurp?
Yes. Lean, purple drank, sizzurp, dirty sprite, and purple stuff all name the same mixture: prescription codeine-promethazine cough syrup in soda. The purple color comes from the syrup formulation, not from a different drug.
Why Is Lean Dangerous With Alcohol?
Codeine, promethazine, and alcohol all depress the central nervous system, and the prescribing label instructs that alcohol be avoided with the syrup. Combined, they suppress breathing at amounts each substance alone would not.
Is Codeine Cough Syrup Safe for Teenagers?
No. The FDA limited prescription codeine and hydrocodone cough medicines to adults 18 and older in January 2018, after determining the risks of addiction, overdose, death, and slowed breathing outweigh the benefits in anyone younger.
What Makes Some People Overdose on Codeine Faster?
CYP2D6 ultra-rapid metabolizers convert codeine to morphine unusually fast, reaching dangerous morphine levels from standard amounts. The FDA-approved label estimates their prevalence at 1 to 10 percent for Whites and above 10 percent in certain ethnic groups.