Could a dose of methadone plus 15mg of klonopin (clonazepam) be a fatal overdose?

Would depend. It would depend on the dose of Methadone given and the tolerance level of the individual for both Methadone and klonopin (clonazepam). That is a very large dose of Klonopin (clonazepam) - i certainly would suggest a visit to the er. Good luck.

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