Title: Background information

Context:
Co-administration of a drug capable of inducing fatal drug-drug interactions: Providers should carefully rule out and avoid potential drug interactions prior to initiating LOT. For example, the following combinations are dangerous:[66] i)Opioids with benzodiazepines (compared to patients with no prescription, the odds ratio [OR] and 95% confidence interval [CI] for drug-related death was OR: 14.92, 95% CI: 7.00- 31.77 for patients who filled a prescription for opioids and benzodiazepines; OR: 3.40, 95%  CI: 1.60-7.21 for patients who filled only an opioid prescription, and 7.21, 95% CI: 3.33-15.60 for patients who filled only a benzodiazepine prescription) (see Recommendation 5) [66,67], ii)Fentanyl with CYP3A4 inhibitors, iii) Methadone with drugs that can prolong the QT interval (the heart rate’s corrected time  interval from the start of the Q wave to the end of the T wave) (e.g., CYP450 2B6 inhibitors)

Question: What combinations of drugs are dangerous?

Answer: i)Opioids with benzodiazepines (compared to patients with no prescription, the odds ratio [OR] and 95% confidence interval [CI] for drug-related death was OR: 14.92, 95% CI: 7.00- 31.77 for patients who filled a prescription for opioids and benzodiazepines; OR: 3.40, 95%  CI: 1.60-7.21 for patients who filled only an opioid prescription, and 7.21, 95% CI: 3.33-15.60 for patients who filled only a benzodiazepine prescription) (see Recommendation 5) [66,67], ii)Fentanyl with CYP3A4 inhibitors, iii) Methadone with drugs that can prolong the QT interval (the heart rate’s corrected time  interval from the start of the Q wave to the end of the T wave) (e.g., CYP450 2B6 inhibitors)