“…Intrathecal injection of drugs may cause pain, numbness and dysaesthesias, muscle spasm, weakness, hypertension, tachycardia, hypotension, syncope, transient unilateral ipsilateral facial weakness, major motor seizure, spinal seizure, transient bladder impairment,14 or even unusual sensorineural hearing loss 15. It is difficult to evaluate adverse effects from only one case report, but we did not see any.…”