Mixing Mephedrone (meow) and Opioids
Caution
The stimulant hides how much the opioid is slowing you; if it wears off first, breathing can stop. Take less of each than usual, do not use alone, and keep naloxone nearby.
Stimulants increase respiration rate allowing a higher dose of opiates. If the stimulant wears off first then the opiate may overcome the patient and cause respiratory arrest.
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.
Headspace vs physical riskCan you mix Mephedrone (meow) and Opioids?
MixSafe rates mixing Mephedrone and Opioids as "Caution" — carries risk that is worth understanding before combining. Reduce doses and do not use alone. Source: TripSit drug combination chart, retrieved 2026-08-20. Educational information, not medical advice.
- Opioids
- Full agonists — heroin, oxycodone, morphine
- Mephedrone also called
- 4-mmc, 4mmc, meow, m-cat, 4-methylmethcathinone, bath salts
- Opioids also called
- opiate, opiates, opioid, heroin, dope, smack
TripSit drug combination chart, retrieved 2026-08-20. View the dataset.
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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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All combinations →Rated caution. Educational information only, not medical advice. Absence of a documented interaction is not evidence of safety.