An underappreciated risk of illicit substance use
There is a paucity of evidence regarding the metabolism and pharmacokinetic interactions with illicit substances, and further research is needed. Despite the absence of comprehensive data on the subject, the available information indicates the use of illicit substances may have a significant impact on medications used to treat comorbid conditions. Alternatively, those medications may affect the kinetics of recreationally used substances. The risk of adverse consequences of drug–drug interactions is yet another reason patients should be encouraged to avoid use of substances and seek treatment for substance use disorders. When determining the most appropriate therapy for comorbid conditions for patients who are using illicit substances and are likely to continue to do so, clinicians should take into consideration potential interactions among prescription medications and the specific illicit substances the patient uses.
Related Resources
- Lindsey W, Stewart D, Childress D. Drug interactions between common illicit drugs and prescription therapies. Am J Drug Alcohol Abuse. 2012;38(4):334-343.
- Maurer H, Sauer C, Theobald D. Toxicokinetics of drugs of abuse: current knowledge of the isoenzymes involved in the human metabolism of tetrahydrocannabinol, cocaine, heroin, morphine, and codeine. Ther Drug Monit. 2006;28(3):447-453.
- Dean A. Illicit drugs and drug interactions. Pharmacist. 2006;25(9):684-689.
Drug Brand Names
Carbamazepine • Carbatrol, Tegretol
Clozapine • Clozaril
Donepezil • Aricept
Ketoconazole • Nizoral
Paliperidone palmitate • Invega sustenna
Phenytoin • Dilantin, Phenytek
Quinidine • Cardioquin, Duraquin
Theophylline • Elixophylline, Theochron