The Zanaflex contains Tizanidine and is used as antispastic in MS and spinal injury. The half life of Tizanidine is 2.5 hours but its metabolites have half life of 20-40 hours. So the single dose will take 80-90 hours to get out of system and in hair follicle test it will take 90 days.
- Tizanidine Information for Consumers
- Tizanidine Information for Healthcare Professionals (includes dosage details)
- Side Effects of Tizanidine (detailed)
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