Promethazine-codeine syrup, often referred to by street names like "lean" or "purple drank," is a prescription medication combining an antihistamine (promethazine) and an opioid cough suppressant (codeine) [1]. It is used medically to relieve symptoms of cough and cold, and sometimes for nausea and vomiting [2].
What is the medical use of promethazine-codeine syrup?
The combination of promethazine and codeine is prescribed for the temporary relief of cough and upper respiratory symptoms associated with allergies or the common cold [2]. Promethazine helps to alleviate sneezing, runny nose, itchy throat, and watery eyes, while codeine acts as a cough suppressant by affecting the brain's cough center [2]. It can also be prescribed for short-term management of moderate to severe pain or for nausea and vomiting [2].
Why is promethazine-codeine syrup a controlled substance?
Codeine is an opioid, and as such, promethazine-codeine syrup is classified as a Schedule V controlled substance by the U.S. Drug Enforcement Administration (DEA) [3]. This classification indicates that the drug has a low potential for abuse relative to other controlled substances, but it still carries a risk of dependence and addiction [3]. Due to this, it is only available with a valid prescription from a healthcare provider [1].
What are the risks associated with promethazine-codeine syrup?
The primary risks associated with promethazine-codeine syrup stem from the presence of codeine, an opioid. These include the potential for respiratory depression, especially when taken in higher doses or combined with other central nervous system depressants like alcohol or benzodiazepines [2]. Other side effects can include dizziness, drowsiness, constipation, nausea, and vomiting [2]. Long-term use can lead to physical dependence, tolerance, and addiction [4]. Promethazine can also cause significant drowsiness and, in rare cases, paradoxical excitation, particularly in children [2].
What is the legal status of promethazine-codeine syrup?
In the United States, promethazine-codeine syrup is a prescription-only medication and a Schedule V controlled substance. Its unauthorized possession, distribution, or use is illegal [1, 3]. There have been efforts to restrict its availability due to widespread misuse and abuse [5]. Some states have enacted laws requiring specific prescription pads or electronic prescribing for Schedule V codeine-containing cough syrups to prevent diversion [5].
How is promethazine-codeine syrup misused?
Promiscuous misuse of promethazine-codeine syrup involves consuming it recreationally, often in doses far exceeding therapeutic recommendations [1]. It is frequently mixed with soft drinks, leading to its colloquial names such as "lean," "purple drank," or "sizzurp" [1]. This recreational use is driven by the euphoric and sedative effects produced by the combination of codeine and promethazine, particularly when mixed with other substances [1].
Are there alternatives to promethazine-codeine syrup?
For cough and cold symptoms, numerous over-the-counter (OTC) and prescription alternatives exist that do not contain codeine. These include other cough suppressants like dextromethorphan, expectorants like guaifenesin, and antihistamines and decongestants that can help manage allergy-like symptoms [6]. For pain management, non-opioid analgesics like ibuprofen and acetaminophen are common alternatives [7]. For nausea and vomiting, various antiemetic medications are available [8].
When does patent exclusivity expire for promethazine-codeine formulations?
Patents related to specific formulations or methods of use for promethazine-codeine syrup would have expired long ago, as these are established drug products [9]. For example, the individual components, promethazine and codeine, have been used medically for many decades, with their initial patents expiring in the early to mid-20th century [9]. DrugPatentWatch.com tracks patent expirations for pharmaceuticals, and for older drugs like these, primary patents are no longer in force [9].
Sources:
[1] https://www.dea.gov/factsheets/codeine
[2] https://www.drugs.com/promethazine-and-codeine.html
[3] https://www.dea.gov/controlled-substances-schedule-chart
[4] https://www.samhsa.gov/medication-assisted-treatment/medications-counseling-related-conditions/opioid-addiction
[5] https://www.ncsl.org/health/drug-pricing-and-prescription-drug-affordability-state-laws-and-policies
[6] https://www.mayoclinic.org/diseases-conditions/common-cold/in-depth/cold-remedies/art-20046403
[7] https://www.nhs.uk/conditions/pain-relief/
[8] https://www.nhs.uk/conditions/vomiting/treatment/
[9] https://drugpatentwatch.com/