Adulterant-Contaminant in MT-45 or Coingestion? – Reply from Authors

In a commentary to our publication entitled "Acute skin and hair symptoms followed by severe, delayed eye complications in subjects using the synthetic opioid MT-45",[1] Yip and Deng [2] argue that the lack of opioid symptoms would indicate involvement of another drug class, possibly arsenic or 2,4-dinitrophenol (DNP). In this respect, it should be emphasized that the patients did not seek hospital care for acute opioid overdose symptoms but for unexpected, late adverse side effects involving the skin, hair, and eyes.

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