Insys Issues Clarify Statement: Says No Single Physician Has Written 5%+ of Total Subsys Scripts

Insys Therapeutics, Inc.

today issued a clarifying statement regarding its Subsys® (fentanyl sublingual spray) product. Insys takes patient safety very seriously and we are committed to working with physicians to help ensure the proper prescribing and use of our products. In terms of our business, we have continually expanded our commercial organization since launch due to the success of Subsys in treating break through cancer pain in opioid tolerant cancer patients who are 18 years or older. As such, we have expanded our prescriber base and for 2014 year-to-date, no single physician has written more than 5% of total Subsys prescriptions. Based on recent activity, we feel it is appropriate to summarize and address some of the important items regarding Subsys. Subsys is governed by the Transmucosal Immediate Release Fentanyl ("TIRF") Risk Evaluation and Mitigation Strategy ("REMS") Access program, which was approved and launched by the FDA in March 2012. lnsys began commercializing Subsys on March 26, 2012 after the implementation of this TIRF-REMS program. This TIRF-REMS program is designed to ensure informed risk-benefit decisions before initiating treatment and appropriate use of TIRF medicines. The purpose of the TIRF-REMS program is to mitigate the risk of misuse, abuse, addiction, overdose and serious complications due to medication errors with the use of TIRF medicines. Subsys can only be prescribed after physicians have undergone training on the risks and benefits of such products and products can only be dispensed via pharmacies who are REMS enrolled. Additionally, all patients and physicians are required to sign a prescriber patient agreement form as part of this process. Insys continues to support the TIRF-REMS program that was co-developed with other participant companies. More information regarding the TIRF-REMS program can be found at www.tirfremsaccess.com. Insys does not sell directly to physicians. lnsys only sells Subsys through DEA approved wholesalers who monitor and track prescribing activity for this TIRF class of drugs and all opioids. Insys remains committed to our compliance program and protocols in place that are designed to ensure our sales and marketing practices comply with applicable laws.