Chlordiazepoxide — sold under the brand name Librium — is the most widely prescribed medication for medically supervised alcohol detox in the UK. If you are about to start a detox programme, or you are trying to understand what medication you will be taking, this guide explains what chlordiazepoxide is, how it works, what to expect, and what to watch out for.
What is chlordiazepoxide?
Chlordiazepoxide is a long-acting benzodiazepine. Benzodiazepines work by enhancing the effect of GABA (gamma-aminobutyric acid), the brain's primary inhibitory neurotransmitter. In plain language: alcohol suppresses neural activity; when you stop drinking, the brain over-stimulates to compensate. Chlordiazepoxide reduces this over-stimulation, managing withdrawal symptoms and significantly reducing the risk of seizures.
Why chlordiazepoxide specifically?
The long half-life of chlordiazepoxide (24–48 hours) makes it particularly suitable for alcohol detox. It provides smooth, continuous coverage that reduces the risk of rapid symptom emergence between doses. It is gradually reduced over the course of the programme in a structured reducing regime rather than stopped abruptly.
What to expect when taking chlordiazepoxide
- Sedation — you will likely feel sleepy, particularly in the first few days. This is normal and expected.
- Reduced anxiety — the medication significantly reduces the anxiety and agitation of acute withdrawal.
- Reduced tremor — the physical shaking of withdrawal should diminish within the first day of treatment.
- Possible dizziness or unsteadiness — particularly at higher doses. Be careful when standing up.
- Do not drive — chlordiazepoxide impairs driving ability. Do not drive or operate machinery during your programme.
- Do not drink alcohol — drinking while taking chlordiazepoxide is dangerous and potentially fatal.
The reducing regime
Your prescriber writes a specific reducing regime for you — a schedule of gradually decreasing doses over the course of your programme. Following this schedule precisely is important. Do not stop the medication abruptly without clinical guidance.
Thiamine supplementation
Chlordiazepoxide is prescribed alongside thiamine (Vitamin B1) supplementation as a matter of routine. Heavy alcohol use causes thiamine deficiency, which can lead to Wernicke's encephalopathy — a serious neurological complication. Thiamine supplementation during detox is a clinical requirement, not an optional addition.
This article is for general information only. All prescribing decisions are made by a GMC-registered prescriber following individual clinical assessment.
