Kress, H.G., Oronska, A., Kaczmarek, Z., Kaasa, S., Colberg, T., & Nolte, T. (2009). Efficacy and tolerability of intranasal fentanyl spray 50 to 200 microg for breakthrough pain in patients with cancer: A phase III, multinational, randomized, double-blind, placebo-controlled, crossover trial with a 10-month, open-label extension treatment period. Clinical Therapeutics, 31(6), 1177–1191.
To assess the efficacy and long-term tolerability of infranasal fentanyl spray (INFS)
In an initial titration phase, the effective dose of INFS was determined for each patient. An effective dose was defined as one that was successful in treating three of four episodes of breakthrough pain. If pain relief was insufficient, an additional dose was administered in the alternate nostril. Titration was repeated if the patients’ background opioid dosage was adjusted during the trial. During the efficacy phase patients received, in randomized double-blind sequence, the titrated effective dose of INFS or placebo for administration at home. Patients were randomized to treatment sequences for eight episodes of breakthrough pain. Patients used a diary to record pain intensity at 0, 10, 20, 40, and 60 minutes after administration. Pain ratings were according to a numeric rating scale. Patients were monitored during the 10-month open-label extension phase. Patients received 30-day supplies of INFS, in appropriate doses, during monthly clinic visits. Weekly telephone contact provided data about adverse events, concurrent medications, and INFS efficacy.
Double-blind randomized, double-dummy two-way crossover study
INFS titrated to an effective dose demonstrated some effectiveness in relieving breakthrough pain in this group of patients. Long-term tolerability could not be clearly determined because of the small number of patients who completed the extension phase of the study. Most patients appeared to tolerate IFNS well.
Findings suggest that INFS may be a useful adjunctive approach to deal with the breakthrough pain of patients with cancer who have chronic opioid-managed pain. INFS may be more useful as a short-term, rather than a long-term approach; the matter of long-term efficacy and tolerability requires further study.