Complex Regional Pain Syndrome (CRPS) is a chronic pain condition that most often affects a person’s limbs. If you are experiencing pain due to an injury, trauma, or surgery in areas such as the arms, legs, hands or feet, you may have CRPS. Local doctors need your help with a research study testing an investigational medication for Complex Regional Pain Syndrome. To qualify, patients must be 1) at least 18 years of age, 2) have been diagnosed with CRPS (Type II) and 3) have been receiving treatment for CRPS for at least one month. Please note: additional requirements apply.