WARNING: LIFE-THREATENING RESPIRATORY DEPRESSION; IONSYS® REMS; ADDICTION, ABUSE, AND MISUSE; CYTOCHROME P450 3A4 INTERACTION; and RISKS FROM CONCOMITANT USE WITH BENZODIAZEPINES OR OTHER CNS DEPRESSANTS
Serious, life-threatening, or fatal respiratory depression may occur with use of IONSYS®. Monitor for respiratory depression, especially during initiation of IONSYS®. Only the patient should activate IONSYS® dosing.
IONSYS® exposes users to risks of addiction, abuse, and misuse, which can lead to overdose and death. Assess each patient’s risk before prescribing, and monitor regularly for development of these behaviors or conditions.
The concomitant use of IONSYS® with all cytochrome P450 3A4 inhibitors may result in an increase in fentanyl plasma concentrations, which could increase or prolong adverse drug reactions and may cause potentially fatal respiratory depression. In addition, discontinuation of a concomitantly used cytochrome P450 3A4 inducer may result in an increase in fentanyl plasma concentration. Monitor patients receiving IONSYS® and any CYP3A4 inhibitor or inducer.
Concomitant use of opioids with benzodiazepines or other central nervous system (CNS) depressants, including alcohol, may result in profound sedation, respiratory depression, coma, and death.
Most common adverse reactions (frequency ≥2%) were headache, hypotension, nausea, vomiting, anemia, dizziness, application site reaction-erythema, pruritus, and urinary retention.