Xanax vs Klonopin: alprazolam and clonazepam compared
Xanax (alprazolam) and Klonopin (clonazepam) are benzodiazepines prescribed for anxiety and panic. The main difference is speed and duration: alprazolam acts quickly and wears off sooner, clonazepam acts more slowly and lasts longer. Both are controlled substances with the same serious risks.
Updated October 4, 2026
At a glance
- Approved for
- Xanax
- Anxiety disorders and panic disorder
- Klonopin
- Panic disorder and some seizure disorders
- Onset and duration
- Xanax
- Fast onset, shorter acting; an extended-release form exists
- Klonopin
- Slower onset, longer acting
- Usual dosing
- Xanax
- Several times a day, or once daily as extended-release
- Klonopin
- Once or twice a day
- Federal schedule
- Xanax
- Schedule IV
- Klonopin
- Schedule IV
- Generic available
- Xanax
- Yes
- Klonopin
- Yes
Xanax alprazolam | Klonopin clonazepam | |
|---|---|---|
| Approved for | Anxiety disorders and panic disorder | Panic disorder and some seizure disorders |
| Onset and duration | Fast onset, shorter acting; an extended-release form exists | Slower onset, longer acting |
| Usual dosing | Several times a day, or once daily as extended-release | Once or twice a day |
| Federal schedule | Schedule IV | Schedule IV |
| Generic available | Yes | Yes |
Why duration matters
A short-acting benzodiazepine like alprazolam can bring quicker relief, but its effect rises and falls within hours, which can lead to rebound anxiety between doses. Clonazepam’s longer action gives steadier levels and is often preferred when daily treatment is needed, and when a benzodiazepine is being tapered.
Risks that apply to both
Both carry an FDA boxed warning about abuse, dependence and withdrawal, and about dangerous slowed breathing when combined with opioids or alcohol. Stopping suddenly after regular use can cause severe withdrawal, including seizures, so any reduction is gradual and planned with the prescriber. Both impair driving and raise the risk of falls in older adults. For long-term anxiety, SSRIs, buspirone and therapy are usually preferred, with a benzodiazepine for short periods.
Filling and cost
Both generics cost pharmacies little, so cash prices vary between pharmacies. As Schedule IV drugs they can be refilled up to five times within six months, every fill is reported to the state monitoring program, and transfers between pharmacies are limited, so choose the pharmacy before the first fill. Our state guides cover the local rules.
Getting it filled smoothly
Pharmacists check the state monitoring program before filling a controlled prescription, and a new patient may be asked for identification, so allow a little extra time at a pharmacy you have not used before.
Questions for your prescriber
- What should I do if I miss a dose?
- Is any alcohol safe while I take it?
- How long should I take this, and what is the plan to stop?
- Would a longer-term treatment such as an SSRI or therapy suit me better?
- Is it safe with my other medicines, including pain medicines?
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Sources
- FDA, boxed warning for benzodiazepines
- DEA, controlled substance schedules
- DailyMed, FDA-approved prescribing information
- MedlinePlus drug information (National Library of Medicine)
Written by the Script Unlock editorial team from the sources above. It is general information, not advice for you or your pet; your prescriber decides which medicine is right.
Script Unlock is a marketplace that lets licensed pharmacies quote a cash price on your prescription. It does not prescribe, dispense or sell medication, does not process patient payments, and does not give medical advice. Always follow the instructions of your prescriber and pharmacist and read the medication guide supplied with your medicine.