Lofexidine

CAS No:
31036-80-3 Category:
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Product Details:

  • CAS No: 31036-80-3
  • AHFC code:
  • Synonyms: 2-(1-(2,6-Dichlorophenoxy)ethyl)-4,5-dihydro-1H-imidazole 2-(alpha-(2,6-Dichlorophenoxy)ethyl)2-imidazoline Lofexidina [inn-spanish] Lofexidine hydrochloride Lofexidinum [inn-latin]
  • ATC Code: N07BC04
  • Chemical Formula: C15H10Cl2N2O2
  • Molecular Weight: 259.132
  • Assay/Purity: Typically NLT 98%
  • DrugBank: DB04948
  • SMILES: CC(OC1=C(Cl)C=CC=C1Cl)C1=NCCN1
  • InChl: KSMAGQUYOIHWFS-UHFFFAOYSA-N
  • PubChem: 30667
  • IUPAC: 2-[1-(2,6-dichlorophenoxy)ethyl]-4,5-dihydro-1H-imidazole

Additional Details

Indication:
Investigated for use/treatment in addictions and substance abuse.
Pharmacodynamics:
Lofexidine is an orally active imidazoline adrenergic alpha-2-receptor agonist; and is believed to have a high affinity for 2A receptor subtypes resulting in less anti-hypertensive activity than clonidine, a non-selective alpha-2-receptor agonist. Hypotension may occur in susceptible subjects, accompanied by a decrease in heart rate. Abrupt discontinuation of lofexidine has been, in some cases, associated with a transient increase in blood pressure to higher than pre-treatment levels. It selectively stimulates receptors in the brain that monitor catecholamine levels in the blood. These receptors close a negative feedback loop that begins with descending sympathetic nerves from the brain that control the production of catecholamines (epinephrine, also known as adrenaline, and norepinephrine) in the adrenal medulla. By fooling the brain into believing that catecholamine levels are higher than they really are, lofexidine causes the brain to reduce its signals to the adrenal medulla, which in turn lowers catecholamine production and blood levels. The result is a lowered heart rate and blood pressure. This central action is responsible for the suppression of opiate withdrawal symptoms.
Mode of Action:
Lofexidine is an alpha2-adrenergic receptor agonist.
Metabolism:
Lofexidine undergoes extensive metabolism in the liver and excretion is mainly by the kidney.
Toxicity:
Lofexidine was tolerated at high dosage in singe dose toxicity studies in animals, the LD50 being >77 mg/kg. With repeat dosing in mice, rats and dogs symptoms related to the pharmacology of the drug (ataxia, sedation, tremor, unkempt appearance and exhaustion) appeared. Overdosage may cause hypotension, bradycardia and sedation.
General Reference:
Walsh SL, Strain EC, Bigelow GE: Evaluation of the effects of lofexidine and clonidine on naloxone-precipitated withdrawal in opioid-dependent humans. Addiction. 2003 Apr;98(4):427-39. Pubmed Manufacturer Website Link
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