United States of America. Similar dosing and tablet strength for two drugs with look-alike generic names, tiagabine (Gabatril: Abbott) and tizanidine (Zanaflex: Athena Neurosciences) increases the potential for confusing these products.
Tiagabine, used to treat seizures, is available in 4 mg tablets with a dosage range from 4 mg daily to 8 mg four times daily. Tizanidine, used to treat muscle spasticity, is also available in 4 mg tablets with a dosage range of 4 mg to 8 mg every 6 to 8 hours.
Reference: ISMP Medication Safety Alert! Vol. 3, Issue 24, 1 December 1998.