Librium (Chlordiazepoxide) at a glance: schedule, half-life, and class
- Generic name
- Chlordiazepoxide hydrochloride
- Brand names
- Librium; with clidinium: Librax; with amitriptyline: Limbitrol (discontinued)
- Drug class
- Long-acting benzodiazepine
- US legal status
- Schedule IV, prescription only
- Approved uses
- Anxiety disorders; acute alcohol withdrawal; anxiety before surgery
- Forms
- Capsules (5, 10, 25 mg)
- Onset
- 30 minutes to 2 hours
- Half-life
- 5 to 30 hours, with active metabolites such as desmethyldiazepam lasting days
- Reversal agent
- Flumazenil (hospital use only)
Librium uses: what chlordiazepoxide is prescribed for
Chlordiazepoxide treats anxiety and the agitation, tremor, and seizure risk of acute alcohol withdrawal. Its long-lasting metabolites give a smooth, self-tapering effect, which is why it remains a standard choice for alcohol withdrawal.[1]
Combined with clidinium in Librax it is used for irritable bowel syndrome and peptic ulcer symptoms.[1]
Librium dosage: how chlordiazepoxide is usually prescribed
The figures below come from the FDA-approved label and describe how prescribers typically use chlordiazepoxide. They are not personal dosing advice. A prescriber sets the dose for each person and adjusts it over time.[1]
| Product | Typical adult dose | Notes from the label |
|---|---|---|
| Mild to moderate anxiety | 5 or 10 mg three or four times a day | Lowest effective dose |
| Severe anxiety | 20 or 25 mg three or four times a day | Reassess regularly |
| Acute alcohol withdrawal | 50 to 100 mg, repeated as needed until agitation is controlled | Up to 300 mg a day; usually in supervised settings |
| Older adults | 5 mg two to four times a day | Higher risk of falls and confusion |
Librium (chlordiazepoxide) side effects and risks
FDA boxed warnings
- Use with opioids can cause profound sedation, slowed breathing, coma, and death.[2]
- Abuse, misuse, and addiction, which can lead to overdose and death, especially with alcohol, opioids, or other drugs.[3]
- Physical dependence: stopping suddenly or reducing the dose quickly can cause life-threatening withdrawal reactions, including seizures.
Common side effects include drowsiness, unsteadiness, and confusion, especially in older adults.[1]
Build-up: because its metabolites last days, sedation can increase over the first week and linger after stopping, particularly in older adults and people with liver disease.[1]
Librium interactions: what not to mix with chlordiazepoxide
Choose what it would be combined with:
| Combined with | What happens | Label guidance |
|---|---|---|
| Opioids (oxycodone, hydrocodone, fentanyl, heroin) | Profound sedation, slowed breathing, coma, death | Boxed warning; avoid unless no alternative |
| Alcohol | Deeper sedation, blackouts, slowed breathing | Avoid |
| Other sedatives (sleep medicines, gabapentinoids, muscle relaxants, antihistamines) | Additive drowsiness and impaired coordination | Use caution |
| Strong CYP3A4 inhibitors (ketoconazole, ritonavir) | Higher levels and more sedation | Use caution |
| Clozapine and other antipsychotics | Additive sedation; rare breathing problems | Use caution |
This is not a full list. A pharmacist can check a complete medication list, including supplements and over-the-counter products.[1]
Librium overdose: signs of chlordiazepoxide overdose and what to do
Chlordiazepoxide overdose causes deep drowsiness, confusion, poor coordination, slowed reflexes, and coma. With opioids or alcohol, breathing can stop.[1]
If someone may have overdosed
- Call 911 if the person is unresponsive, hard to wake, or breathing slowly.
- For advice when the person is awake and stable, call Poison Help at 1-800-222-1222 (US, free, 24 hours).
- If opioids could be involved, including pills not from a pharmacy, give naloxone if you have it. Naloxone does not reverse chlordiazepoxide, but it will not harm the person.
- Stay with the person and place them on their side if they are drowsy or vomiting.
Librium withdrawal timeline: how long chlordiazepoxide withdrawal lasts
People who take chlordiazepoxide regularly, even as prescribed, can become physically dependent within weeks. Its very long-lasting metabolites mean withdrawal often starts several days after the last dose.[3]
- Days 3 to 7Symptoms beginRebound anxiety, insomnia, restlessness, sweating, and tremor.
- Weeks 1 to 4Acute withdrawalPanic, irritability, muscle pain, nausea, sensitivity to light and sound, and in severe cases seizures or delirium.
- MonthsProtracted symptoms in some peopleA minority have lingering anxiety, poor sleep, low mood, or tingling that can last weeks to more than 12 months.
Warning: Stopping chlordiazepoxide abruptly after regular use can cause seizures. The dose should be reduced gradually under the care of a prescriber.
A 2025 joint guideline led by the American Society of Addiction Medicine advises tapering gradually, usually by 5% to 10% every 2 to 4 weeks and rarely faster than 25% every 2 weeks, adjusted to how the person feels.[4]
How to get prescribed Librium (chlordiazepoxide) legally in the US
In the United States, chlordiazepoxide is a Schedule IV controlled substance. The only legal way to get it is with a prescription from a clinician registered with the Drug Enforcement Administration (DEA), filled by a licensed pharmacy. Depending on state law, that can be a physician, nurse practitioner, or physician assistant.[5]
- Refills: a Schedule IV prescription can be refilled up to five times within six months of the date it was written. After that, a new prescription is needed.[6]
- Telehealth: federal flexibilities let DEA-registered clinicians prescribe Schedule II to V medicines after a telemedicine visit, without a prior in-person exam, through December 31, 2026. A permanent DEA rule was under final review in late 2026. State rules can be stricter.[7]
- Monitoring: prescribers and pharmacists in most states check a prescription drug monitoring program, a database of controlled-substance prescriptions, before prescribing or dispensing.
- Pharmacies: a legitimate pharmacy always requires a valid prescription, has a licensed pharmacist available, and is licensed in the state it ships to. The FDA's BeSafeRx tool and the NABP's safe pharmacy list help confirm a pharmacy is real.[8][9]
- Cost: generic chlordiazepoxide is inexpensive.
Traveling: keep the medicine in its original pharmacy container and carry a copy of the prescription. Check the rules of the destination country before travel, because many countries restrict controlled medicines or require a permit.
Can you order Librium (chlordiazepoxide) online legally?
Yes, but only with a valid prescription and only from a pharmacy licensed in your state. Many licensed pharmacies, including mail-order pharmacies run by insurers, fill chlordiazepoxide prescriptions online and ship them. Buying chlordiazepoxide from a website that does not require a prescription is illegal, and the product is often fake.[8][10]
- See a licensed clinicianA clinician evaluates you in person or by telemedicine and decides whether chlordiazepoxide is appropriate.
- The prescription goes to a pharmacyPrescriptions are usually sent electronically, straight from the prescriber to the pharmacy you choose.
- The pharmacy checks and fills itA pharmacist verifies the prescription and your identity, then dispenses the medicine in person or by mail.
Signs that an online seller is illegal:
- It sells chlordiazepoxide with no prescription, or after only a short online questionnaire.
- It takes orders through social media, messaging apps, or email.
- It asks for payment in cryptocurrency, gift cards, or money transfers.
- It has no US street address, no state pharmacy license, and no pharmacist to speak to.
- Its prices are far below those of ordinary pharmacies, or it ships from another country.
The FDA's BeSafeRx tool links to each state's license lookup, and the National Association of Boards of Pharmacy lists verified online pharmacies.[8][9]
Librium price: how much does Librium (chlordiazepoxide) cost without insurance?
Generic chlordiazepoxide is inexpensive.
What you pay depends on the strength, the number of doses, your insurance plan, and the pharmacy. Cash prices for the same prescription can differ several times over between pharmacies in the same town, so check current prices before you fill it.
Ways to pay less, legally:
- Ask the prescriber whether a generic chlordiazepoxide is available. FDA-approved generics work the same way as the brand and usually cost much less.
- Compare cash prices between pharmacies before you fill the prescription.
- Use a free prescription discount card, such as GoodRx or SingleCare, when you pay cash. These cards cannot be combined with insurance on the same fill.
- For brand-name medicines, check the manufacturer's savings program or patient assistance program.
- Ask about a 90-day supply or your insurer's mail-order pharmacy, which often lowers the cost per dose when your prescriber agrees it is appropriate.
Warning: A price far below what licensed pharmacies charge, especially with no prescription required, is a strong sign of an illegal seller and counterfeit medicine.[8]
Is Librium legal? Chlordiazepoxide legal status in other countries
| Country | Status |
|---|---|
| United Kingdom | Class C; prescription only |
| Canada | Schedule IV of the Controlled Drugs and Substances Act |
| Australia | Schedule 4 prescription medicine |
| International | Schedule IV of the 1971 Convention on Psychotropic Substances |
Laws change and differ in detail. Check current rules before carrying any controlled medicine across a border.[11]
Common questions about Librium (chlordiazepoxide)
Is Librium used for alcohol withdrawal?
Yes. It is one of the most commonly used medicines to prevent seizures and severe symptoms during alcohol withdrawal.
Is Librium stronger than Xanax?
Milligram for milligram it is weaker, but it lasts much longer. About 25 mg of chlordiazepoxide is roughly equivalent to 0.5 mg of alprazolam.
How long does Librium (chlordiazepoxide) stay in your system?
Its metabolites can be detected in urine for a week or more after regular use.
Can you drink alcohol on Librium?
No. Alcohol adds to sedation and can stop breathing.
Is Librium (chlordiazepoxide) addictive?
It can cause dependence and addiction, like other benzodiazepines, especially with long-term use.
Can you buy Librium (chlordiazepoxide) without a prescription?
No. Librium (chlordiazepoxide) is a Schedule IV controlled substance in the US, so it is illegal to buy or possess it without a valid prescription. Websites and social media sellers that offer it without one are not legal pharmacies, and the DEA warns that pills sold this way are often counterfeit and can contain fentanyl. The legal route is a visit with a licensed clinician, in person or by telehealth, and a prescription filled at a state-licensed pharmacy. The FDA's BeSafeRx tool and the NABP's safe pharmacy list help confirm an online pharmacy is real.
Sources
- Librium (chlordiazepoxide) prescription information. DailyMed, US National Library of Medicine.
- FDA warns about serious risks and death when combining opioid pain or cough medicines with benzodiazepines. US Food and Drug Administration, 2016.
- FDA requiring Boxed Warning updated to improve safe use of benzodiazepine drug class. US Food and Drug Administration, 2020.
- Joint Clinical Practice Guideline on Benzodiazepine Tapering. American Society of Addiction Medicine, 2025.
- Controlled Substance Schedules. DEA Diversion Control Division.
- 21 CFR 1306.22, Refilling of prescriptions (Schedules III and IV). Electronic Code of Federal Regulations.
- Prescribing controlled substances via telehealth. US Department of Health and Human Services.
- BeSafeRx: Your Source for Online Pharmacy Information. US Food and Drug Administration.
- Safe Pharmacy. National Association of Boards of Pharmacy.
- One Pill Can Kill. US Drug Enforcement Administration.
- International drug control conventions. United Nations Office on Drugs and Crime.
