A drug called AV650 (tolperisone HCl) will be given to patients who have spasticity following a spinal cord injury. This study has three purposes:

1. To determine whether AV650 is safe for patients with spinal cord injury;
2. To assess what the body does with AV650 once it is ingested; and,
3. To gather some early evidence as to whether AV650 is effective in treating spasticity in patients with spinal cord injury.

Inclusion Criteria:

• Subjects who provide written informed consent.
• Male or female subjects aged 18 to 70 years.
• In the judgment of the Principal Investigator, able to comply with protocol requirements.
• Subjects willing and able to withdraw from other anti-spasmodic/muscle relaxant drugs for at least two weeks before randomization (including but not limited to baclofen, benzodiazepines, clonazepam, clonidine, dantrolene, diazepam, gabapentin, and tizanidine).
• Neurological level between C-4 and T-12 spinal cord levels.
• SCI duration of 6 or more months.
• Muscle tone sufficient to score at least two (2) on the Ashworth Scale for at least one of the following lower muscle groups: ankle plantar flexors (gastrocnemius), knee extensors (quadriceps), knee flexors (hamstrings) and/or hip adductors (adductors) and seven (7) for the most spastic limb.
• ASIA Impairment Scale Exam score of B, C or D.
• Female subjects of childbearing potential must be either surgically sterile or using an effective method of contraception.
• Female subjects of childbearing potential must have a negative urine pregnancy test at baseline (Study Day 0).

Exclusion Criteria:

• Subjects with a known hypersensitivity to lidocaine or non-steroidal analgesics.
• Subjects with clinically significant cardiovascular, pulmonary, endocrine, hepatic, renal, neurological, metabolic, or psychiatric disease.
• Any recent history of mental illness, drug addiction, recreational drug use, or alcoholism and/or any similar condition that the investigator feels should prohibit study participation.
• Any significant illness during the four weeks preceding Study Day 1.
• History of cancer or inflammatory arthritis of large joints.
• History of gastric or duodenal ulcer.
• Concurrent symptomatic urinary tract infections with fever.
• Severe physical injury, direct impact trauma, or neurological trauma within the last 6 months not including Spinal Cord Injury.
• ASIA Impairment Scale score of A or E.
• Uncontrolled hypertension or hypotension.
• Percussive tenderness of vertebral body or spinous process.
• Subjects with corrective surgery to or contracture of the measurable hip, knee, or ankle joints.
• Subjects known to be Hepatitis B or HIV positive.
• Female subjects who are pregnant or nursing.
• Subjects who have received an investigational drug within 30 days before Screening visit.
• Subjects with any documented episodes of seizures.
• Subjects requiring use of clinically relevant 2C19 or 2D6 inhibitors, or concomitant use of lidocaine.
• Use of rescue medication(s) within 48 hours of baseline procedures.