spec sheet11 rows
Clonazepam is a widely prescribed, long-acting benzodiazepine used for anxiety, panic and seizure disorders. It works by boosting GABA, the brain's main calming neurotransmitter, which produces sedation, anxiety relief and strong anticonvulsant effects. Its long duration makes it useful medically but also means it accumulates, and like all benzodiazepines it causes dependence and is dangerous with other depressants.
- Anticonvulsant (seizure control)
- Anxiety and panic relief
- Sustained calming effect
- Impaired memory and coordination
Mechanism
Clonazepam is a positive modulator at the benzodiazepine site of the -A receptor; it increases the frequency of chloride-channel opening when GABA binds, amplifying inhibitory signaling across the brain. This broad dampening underlies its anticonvulsant (seizure-suppressing), anxiolytic and sedative properties, and its potency and long make it a favored anticonvulsant benzodiazepine.
receptor fingerprint
-A receptor (benzodiazepine site)Positive allosteric modulator
Safetyrisks and cautions, not medical advice
Clonazepam is deadly in combination with opioids or alcohol, which stack respiratory depression and can stop breathing. Its long half-life means it builds up with repeated dosing, and daily use leads to tolerance and physical dependence; abrupt withdrawal can cause rebound anxiety, insomnia and seizures, so it must be tapered. It also impairs memory, coordination and driving. Not medical advice.
Interactionsdocumented pairs only, not exhaustive
Oxycodone and clonazepam together cause synergistic central nervous system and respiratory depression, with documented fatalities from this combination [3]. This is a pharmacodynamic interaction; both drugs act as CNS depressants through different mechanisms (benzodiazepine GABA-A enhancement and opioid receptor activation), and their effects on respiratory drive and consciousness are additive. A 38-year-old woman died with plasma clonazepam of 1.41 microg/mL and oxycodone of 0.60 microg/mL; the combination caused fatal respiratory depression and aspiration [3].
The risk extends to other opioids and other CNS depressants; clonazepam is a long-acting benzodiazepine, meaning its presence in the body persists longer than short-acting agents, potentially extending the window of dangerous interaction. What remains unstudied: the threshold doses below which this combination is safer, the role of tolerance in chronic clonazepam users taking opioids for pain, interactions with partial opioid agonists, and whether genetic variation in CYP3A4 (which metabolizes both drugs) modulates the risk.
Checking a whole stack? Run it through interactions + stacks.
Subjective profileweighing the evidence above
Effective for seizures and panic with a doctor steering, but the long half-life means it accumulates, dependence builds quietly, and withdrawal can include seizures, so it always needs a taper. Combined with opioids or alcohol it can stop breathing. Not something to source or self-manage.
Resources
This entry is here for reference.
Research
- 1976first citedClonazepam: a review of its pharmacological properties and therapeutic efficacy in epilepsy
- 2016most recentA Case Report of Clonazepam Dependence: Utilization of Therapeutic Drug Monitoring During Withd…
- 1.Clonazepam: a review of its pharmacological properties and therapeutic efficacy in epilepsy
- 2.A Case Report of Clonazepam Dependence: Utilization of Therapeutic Drug Monitoring During Withdrawal Period
- 3.A fatal drug interaction between oxycodone and clonazepam.
3 listed here; entry last updated August 2026
Reviews
My notesprivate to this device
FAQ
What is clonazepam prescribed for?
Mainly panic disorder, certain seizure disorders and anxiety; its long action and anticonvulsant strength make it useful in these settings.
Why does it feel long-lasting?
It has a long half-life, so it stays active for many hours and can accumulate with daily dosing, which is why next-day grogginess is common.
Is withdrawal risky?
Yes. After regular use, stopping suddenly can cause severe rebound symptoms and seizures, so doctors taper it slowly.
Adverse effects
- Impaired memory and coordination
Notes and cautions
- Daytime drowsiness and 'hangover'
- Accumulation with repeated dosing
- Tolerance, dependence and hard withdrawal