Combination

Mixing Cocaine and Methadone

StimulantOpioid
Cocaine also called
coke, crack, blow, snow, yayo
Methadone also called
dolophine, methadose, done
Verdict

Unsafe

Both prolong the QT interval, and methadone's QT effect is dose-dependent and associated with a roughly four-fold rise in sudden cardiac death. Cocaine adds its own arrhythmia risk on top while masking sedation. This is a heart-rhythm risk more than a breathing one, and it is not something you would feel building.

Risk / Physical

The risk here is to the body — breathing, heart, temperature or organs. Set limits before you start, because this kind of harm does not announce itself in time to react.

Can you mix Cocaine and Methadone?

Risk of serious physical or psychological harm. Not recommended under any circumstances.

Methadone
Long-acting — outlasts its own effects by many hours
Source

Checking more than two?

Combinations of three or more carry risks that no pair-by-pair chart can show. The checker rates every pair at once and flags the whole-mix ones on top.

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Rated unsafe. Educational information only, not medical advice. Absence of a documented interaction is not evidence of safety.