[Multiple drug addiction]

Area of Science:

• Pharmacology
• Epidemiology
• Clinical Medicine

Context:

• Polydrug use, historically prevalent in the USA, has seen a marked increase across France and Europe over the past decade.
• Specialized centers have identified and documented the significant harms associated with polydrug use.
• The abuse of specific drug combinations presents a growing public health concern.

Purpose:

• To emphasize the specific dangers and adverse outcomes associated with the abuse of certain drug associations.
• To review the methodologies employed in studying polydrug use, including animal pharmacology, clinical observations, and epidemiology.
• To address the challenges and limitations in studying polydrug use, particularly in vulnerable populations like the elderly and pregnant women, and the difficulties in extrapolating animal data to humans.

Summary:

• Animal models, while useful for understanding drug interactions and enzyme metabolism, present pharmacokinetic differences between species and challenges in human extrapolation.
• Clinical studies on polydrug use are constrained by ethical considerations, with examples provided including alcohol use in methadone maintenance patients.
• Dangerous combinations include cocaine and amphetamine-type stimulants with opioids or cannabis; other frequent associations involve hypnotics or cough suppressants, increasing mortality in drug addicts.

Impact:

• Polydrug use is associated with increased mortality rates among drug addicts.
• The medical community requires better education and awareness regarding the risks of polydrug use.
• Further research is crucial to understand the harmful effects of combined drug use and the underlying reasons for its epidemic-like spread.