To determine how long it is likely to remain in your body following your final dose, it is necessary to consider the half-life of Klonopin’s active ingredient, clonazepam. Clonazepam has a long elimination half-life within the range of 30 to 40 hours. This means that it will take between 1 and 2 days just to have eliminated 50% of the drug from systemic circulation.
Based on the 30 to 40 hour half-life estimation of clonazepam, we can estimate that Klonopin is likely to stay in your system for 6.88 to 9.17 days after your final dose. Other sources suggest that clonazepam may have a wider ranging half-life between 18.7 hours to 60 hours. If this is the case, it could take between 4.29 and 13.75 days for complete Klonopin excretion.
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