| Major | Alcohol (ethanol) | CNS depressant | Zolpidem with alcohol: additive CNS depression |
| Major | Alcohol (ethanol) | CNS depressant | Benzodiazepine with alcohol: additive CNS and respiratory depression |
| Major | Other opioids (morphine, fentanyl, methadone, oxycodone, hydromorphone, tramadol) | Opioid | Zolpidem with opioids: additive CNS and respiratory depression |
| Major | Other opioids (morphine, fentanyl, methadone, oxycodone, hydromorphone, tramadol) | Opioid | Opioid with benzodiazepine: risk of profound sedation, respiratory depression, coma, and death |
| Major | Strong CYP3A4 inhibitors (ketoconazole, itraconazole, clarithromycin, ritonavir, grapefruit juice) | CYP3A4 inhibitor | Strong CYP3A4 inhibitors raise benzodiazepine exposure |
| Moderate | Other CNS depressants (opioids, benzodiazepines, sleep aids, sedating antihistamines, gabapentinoids, muscle relaxants) | CNS depressant | Benzodiazepine with other CNS depressants: additive sedation |
| Moderate | Other Z-drugs (zolpidem, eszopiclone, zaleplon) | Sedative-hypnotic | Zolpidem with other sedatives: additive CNS depression |
| Moderate | Sedating H1 antihistamines (diphenhydramine, hydroxyzine, chlorpheniramine, doxylamine, promethazine) | Sedating antihistamine | Zolpidem with sedating antihistamines: additive CNS depression |
| Moderate | Sedating H1 antihistamines (diphenhydramine, hydroxyzine, chlorpheniramine, doxylamine, promethazine) | Sedating antihistamine | Benzodiazepine with sedating antihistamines: additive sedation |