Open-Label Study to Evaluate the Effect of Treatment With Fentanyl Buccal Tablets on Pain Anxiety Symptoms When Used for the Management of Breakthrough Pain

Inclusion Criteria: * The patient is willing to provide written informed consent to participate in this study. * The patient is 18 through 80 years of age. * Women must be surgically sterile, 2 years postmenopausal, or, if of childbearing potential, using a medically accepted method of birth control (i.e., barrier method with spermicide, steroidal contraceptive \[oral, transdermal, implanted, and injected contraceptives must be used in conjunction with the barrier method\], or intrauterine device \[IUD\]) and agree to continued use of this method for the duration of the study. * The patient has chronic pain of at least 3 months duration associated with any of the following conditions: cancer, diabetic peripheral neuropathy, postherpetic neuralgia, traumatic injury, complex regional pain syndrome, back pain, neck pain, fibromyalgia (patient has met diagnostic criteria), chronic pancreatitis, or osteoarthritis. Other chronic painful conditions may be evaluated for entry upon discussion with and written approval from the Cephalon medical expert. * The patient is currently using 1 of the following: at least 60 mg of oral morphine/day, or at least 25 mcg of transdermal fentanyl/hour, or at least 30 mg of oxycodone/day, or at least 8 mg of hydromorphone/day, or an equianalgesic dose of another opioid/day as a stable dose of around-the-clock (ATC) therapy for at least 7 days prior to enrollment in the study. * The patient reports an average pain intensity score, over the prior 24 hours, of 6 or less (0=no pain through 10=worst pain) for the chronic pain. * The patient experiences, on average, 1 to 4 BTP episodes per day while taking around-the-clock (ATC) opioid therapy, and on average, the duration of each breakthrough pain (BTP) episode is less than 3 hours. * The patient currently uses opioid therapy for alleviation of BTP episodes occurring at the location of the chronic pain, and achieves at least partial relief. * The patient must be willing and able to successfully self-administer the study drug, comply with study restrictions, and return to the clinic for scheduled study visits and a follow-up evaluation as specified in this protocol. Exclusion Criteria: * The patient has uncontrolled or rapidly escalating pain as determined by the investigator (ie, the ATC therapy may be expected to change between the first and last treatments with study drug), or has pain uncontrolled by therapy that could adversely impact the safety of the patient or that could be comp…