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Librax
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Librax chlordiazepoxide clidinium drug information dosing indications
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Here is a thorough overview of Librax:
Librax (Chlordiazepoxide 5 mg + Clidinium Bromide 2.5 mg)
Drug Class: Anxiolytic + Anticholinergic combination
Composition
Each capsule contains:
- Chlordiazepoxide HCl 5 mg - a benzodiazepine (anxiolytic, muscle relaxant, sedative)
- Clidinium Bromide 2.5 mg - a quaternary anticholinergic/antispasmodic
Indications
Used as adjunctive therapy when GI conditions are associated with anxiety or tension:
- Irritable Bowel Syndrome (IBS) - also called irritable colon, spastic colon, mucous colitis
- Peptic ulcer disease
- Acute enterocolitis
Mechanism of Action
| Component | Mechanism |
|---|---|
| Chlordiazepoxide | Enhances GABA activity in the CNS → reduces anxiety, promotes relaxation |
| Clidinium | Blocks muscarinic (M3) receptors in GI tract → reduces gut motility, relieves spasm, decreases GI secretions |
Together, they address both the psychological (anxiety/tension) and physiological (gut spasm, hypersecretion) components of functional GI disorders.
Dosage
- Standard dose: 1-2 capsules, 3-4 times daily, taken before meals and at bedtime
- Geriatric patients: Start with no more than 2 capsules/day, increase gradually - risk of ataxia, oversedation, and confusion
Contraindications
- Glaucoma (angle-closure or predisposition) - clidinium may raise intraocular pressure
- Prostatic hypertrophy / bladder neck obstruction
- Myasthenia gravis
- Intestinal obstruction or atony
- Hiatal hernia with reflux esophagitis
- Impaired hepatic function (decreased metabolism of both components)
- History of drug abuse or dependence
- Cardiovascular instability
Key Side Effects
From chlordiazepoxide (benzodiazepine):
- Sedation, drowsiness
- Ataxia (especially in elderly)
- Confusion, memory impairment
- Dependence and withdrawal risk with prolonged use
From clidinium (anticholinergic):
- Dry mouth
- Urinary retention
- Constipation
- Blurred vision
- Tachycardia
Important Drug Interactions
- CNS depressants (opioids, alcohol, other benzodiazepines, sleep aids) - risk of profound sedation, respiratory depression, coma
- Carbamazepine - reduces chlordiazepoxide levels via CYP3A4 induction
- Other anticholinergic drugs - additive anticholinergic effects (dry mouth, urinary retention, constipation)
- Botulinum toxin - clidinium may potentiate neuromuscular effects
Pharmacokinetics
| Parameter | Chlordiazepoxide | Clidinium |
|---|---|---|
| Onset | Rapid | ~1 hour after ingestion |
| Duration | Long | ~3 hours |
| Half-life | 5-30 hours | Shorter |
| Metabolism | Hepatic | Hepatic |
| Elimination | Renal | Renal + fecal |
Special Warnings
- Pregnancy/Lactation: Avoid - both components cross placenta; clidinium may inhibit lactation
- Elderly: Use minimum effective dose - high risk of falls, confusion, urinary retention
- Dependence: Chlordiazepoxide is a Schedule IV controlled substance (benzodiazepine) - risk of tolerance and physical dependence with prolonged use
- Abrupt discontinuation: Do not stop suddenly after prolonged use - taper to avoid withdrawal seizures
Storage
Store at 25°C (77°F); acceptable range 15-30°C. Keep in a cool, dry place.
Note: Librax is typically a short-term therapy. Long-term use is discouraged due to benzodiazepine dependence risk. Always use under medical supervision.
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