Benzodiazepines
Clobazam (Onfi / Frisium)
Street names: Onfi, Frisium, Urbanol, Castilium
Overdose? Act now. Call emergency services — say "unresponsive, not breathing". Give naloxone for opioid-like signs. Hotlines
⚡What it does
- Calm with less sedation than classic benzos — a 1,5-benzodiazepine
- Epilepsy and anxiety indications
⚠Key risks
- Dependence still real despite 'gentler' reputation
- Withdrawal seizures — especially dangerous in epilepsy patients who stop abruptly
- Overdose with opioids
- Accumulation with long half-life (~36h)
✚Overdose signs
- Sedation
- Respiratory depression in combination
- Dizziness
📋Quick facts
Also known asOnfi, Frisium, Urbanol, Castilium
CategoryBenzodiazepines
Schedule / classSchedule IV (US); Class C (UK)
Appearance10–20 mg tablets, white scored
Street price~$0.50–$2 per tablet grey-market
Legal statusRx-only, Schedule IV
Last updated2026-09-18
Sources: FDA, EMA
Category comparison — Benzodiazepines
| Substance | Class | Top risks | Street price |
|---|---|---|---|
| Clobazam (Onfi / Frisium) | Schedule IV | Dependence still real despite 'gentler' reputation; Withdrawal seizures — especially dangerous in epilepsy patients who stop abruptly | ~$0.50–$2 per tablet grey-market |
| Clonazepam (Rivotril/Klonopin 2 mg) | Schedule IV | Long half-life — dependence builds silently; Withdrawal can last months | ~$1–$5 per 2 mg tablet |
| Alprazolam (Xanax 2 mg) | Schedule IV | Dependence within weeks; brutal withdrawal (seizures risk); Counterfeit 'bars' increasingly contain fentanyl or bromazolam | ~$2–$10 per 2 mg bar |
Street prices are regional estimates. Potency and cuts vary constantly.
?Frequently asked questions
What does Clobazam (Onfi / Frisium) look like?
10–20 mg tablets, white scored
What are the signs of a Clobazam (Onfi / Frisium) overdose?
Sedation; Respiratory depression in combination; Dizziness Call emergency services immediately.
How addictive is it?
Dependence still real despite 'gentler' reputation Withdrawal can be life-threatening — medical tapering is essential.
🔗Sources & further reading
Facts on this page are compiled from these primary sources. External links open in a new tab.