- Use of anxiolytic, sedative-hypnotic, or other psychotropic drug or substance (including St. John's Wort) within 7 days of start of double-blind treatment. If the patient is taking a sedative deemed necessary for sleep induction or spasticity, the dosage must have been stable for at least 2 weeks. Use of anticholinergic, low-dose tricyclic antidepressant, GABAergic or adrenergic medications for spasticity are permitted if at a stable dose for at least 2 weeks.