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Details

Stereochemistry RACEMIC
Molecular Formula C18H23NO.C6H8O7
Molecular Weight 461.5048
Optical Activity ( + / - )
Defined Stereocenters 0 / 1
E/Z Centers 0
Charge 0

SHOW SMILES / InChI
Structure of ORPHENADRINE CITRATE

SMILES

OC(=O)CC(O)(CC(O)=O)C(O)=O.CN(C)CCOC(C1=CC=CC=C1)C2=C(C)C=CC=C2

InChI

InChIKey=MMMNTDFSPSQXJP-UHFFFAOYSA-N
InChI=1S/C18H23NO.C6H8O7/c1-15-9-7-8-12-17(15)18(20-14-13-19(2)3)16-10-5-4-6-11-16;7-3(8)1-6(13,5(11)12)2-4(9)10/h4-12,18H,13-14H2,1-3H3;13H,1-2H2,(H,7,8)(H,9,10)(H,11,12)

HIDE SMILES / InChI

Description
Curator's Comment: description was created based on several sources, including https://www.drugbank.ca/drugs/DB01173 | https://www.drugs.com/cdi/orphenadrine.html

Orphenadrine is an anticholinergic drug of the ethanolamine antihistamine class used to treat muscle pain and to help with motor control in Parkinson's disease but has largely been superseded by newer drugs. Orphenadrine binds and inhibits both histamine H1 receptors and NMDA receptors. It restores the motor disturbances induced by neuroleptics, in particular, the hyperkinesia. The dopamine deficiency in the striatum increases the stimulating effects of the cholinergic system. This stimulation is counteracted by the anticholinergic effect of orphenadrine. It may have a relaxing effect on skeletal muscle spasms and it has a mood elevating effect. Orphenadrine is indicated as an adjunct to rest, physical therapy, and other measures for the relief of discomfort associated with acute painful musculoskeletal conditions. Orphenadrine is an anticholinergic with a predominantly central effect and only a weak peripheral effect. In addition, it has mild antihistaminic and local anesthetic properties. Parkinson's syndrome is the consequence of a disturbed balance between cholinergic and dopaminergic neurotransmission in the basal ganglia caused by a decrease in dopamine. Orphenadrine restores the physiological equilibrium and has a favorable effect on the rigidity and tremor of Parkinson's disease and Parkinsonian syndromes. Adverse reactions of orphenadrine citrate are mainly due to the mild anticholinergic action of orphenadrine citrate and are usually associated with higher dosage. Dryness of the mouth is usually the first adverse effect to appear. When the daily dose is increased, possible adverse effects include tachycardia, palpitation, urinary hesitancy or retention, blurred vision, dilatation of pupils, increased ocular tension, weakness, nausea, vomiting, headache, dizziness, constipation, drowsiness, hypersensitivity reactions, pruritus, hallucinations, agitation, tremor, gastric irritation and rarely urticaria and other dermatoses

Approval Year

Targets

Targets

Primary TargetPharmacologyConditionPotency
97.7 µM [IC50]
6.0 µM [Ki]
Conditions

Conditions

ConditionModalityTargetsHighest PhaseProduct
Primary
DISIPAL

Approved Use

Orphenadrine citrate extended-release tablets are indicated as an adjunct to rest, physical therapy, and other measures for the relief of discomfort associated with acute painful musculoskeletal conditions.

Launch Date

1957
Primary
DISIPAL

Approved Use

Orphenadrine citrate extended-release tablets are indicated as an adjunct to rest, physical therapy, and other measures for the relief of discomfort associated with acute painful musculoskeletal conditions.

Launch Date

1957
Cmax

Cmax

ValueDoseCo-administeredAnalytePopulation
41.89 ng/mL
100 mg single, oral
dose: 100 mg
route of administration: Oral
experiment type: SINGLE
co-administered:
ORPHENADRINE plasma
Homo sapiens
population: HEALTHY
age: ADULT
sex: MALE
food status: FASTED
49.19 ng/mL
100 mg single, oral
dose: 100 mg
route of administration: Oral
experiment type: SINGLE
co-administered:
ORPHENADRINE plasma
Homo sapiens
population: HEALTHY
age: ADULT
sex: MALE
food status: FED
AUC

AUC

ValueDoseCo-administeredAnalytePopulation
1739.15 ng × h/mL
100 mg single, oral
dose: 100 mg
route of administration: Oral
experiment type: SINGLE
co-administered:
ORPHENADRINE plasma
Homo sapiens
population: HEALTHY
age: ADULT
sex: MALE
food status: FASTED
1772.44 ng × h/mL
100 mg single, oral
dose: 100 mg
route of administration: Oral
experiment type: SINGLE
co-administered:
ORPHENADRINE plasma
Homo sapiens
population: HEALTHY
age: ADULT
sex: MALE
food status: FED
T1/2

T1/2

ValueDoseCo-administeredAnalytePopulation
21.02 h
100 mg single, oral
dose: 100 mg
route of administration: Oral
experiment type: SINGLE
co-administered:
ORPHENADRINE plasma
Homo sapiens
population: HEALTHY
age: ADULT
sex: MALE
food status: FASTED
22.29 h
100 mg single, oral
dose: 100 mg
route of administration: Oral
experiment type: SINGLE
co-administered:
ORPHENADRINE plasma
Homo sapiens
population: HEALTHY
age: ADULT
sex: MALE
food status: FED
Funbound

Funbound

ValueDoseCo-administeredAnalytePopulation
7%
ORPHENADRINE plasma
Homo sapiens
Doses

Doses

DosePopulationAdverse events​
500 mg 1 times / day steady, oral
Highest studied dose
Dose: 500 mg, 1 times / day
Route: oral
Route: steady
Dose: 500 mg, 1 times / day
Sources:
unhealthy, adult
Health Status: unhealthy
Condition: depression
Age Group: adult
Sources:
2 g single, intramuscular
Overdose
unhealthy, adult
Other AEs: Toxic reaction (NOS)...
2 g single, intravenous
Overdose
unhealthy, adult
Other AEs: Toxic reaction (NOS)...
2 g single, oral
Overdose
unhealthy, adult
Other AEs: Toxic reaction (NOS)...
AEs
PubMed

PubMed

TitleDatePubMed
Prochlorperazine in childhood: side-effects.
1977
Anticholinergics for symptomatic management of Parkinson's disease.
2003
Therapeutic response of benzodiazepine, orphenadrine citrate and occlusal splint association in TMD pain.
2003 Apr
Upregulation of cytochromes P450 2B in rat liver by orphenadrine.
2003 Jun
Evaluation of the phencyclidine-like discriminative stimulus effects of novel NMDA channel blockers in rats.
2003 Nov
[Diclofenac 75mg. and 30 mg. orfenadine (Neodolpasse) versus placebo and piroxicam in postoperative analgesia after arthroscopy].
2004
Comparative efficacy and safety of skeletal muscle relaxants for spasticity and musculoskeletal conditions: a systematic review.
2004 Aug
Drug-drug interactions of Z-338, a novel gastroprokinetic agent, with terfenadine, comparison with cisapride, and involvement of UGT1A9 and 1A8 in the human metabolism of Z-338.
2004 Aug 23
Phase II study of weekly paclitaxel and trastuzumab in anthracycline- and taxane-pretreated patients with HER2-overexpressing metastatic breast cancer.
2004 Jan 12
Multicentric phase II trial of gemcitabine plus epirubicin plus paclitaxel as first-line chemotherapy in metastatic breast cancer.
2004 Jan 12
Alternatives to levodopa in the initial treatment of early Parkinson's disease.
2005
Primary chemotherapy with gemcitabine, epirubicin and taxol (GET) in operable breast cancer: a phase II study.
2005 Aug 22
Dimemorfan N-demethylation by mouse liver microsomal cytochrome P450 enzymes.
2005 Jul 1
Benzodiazepine prescribing behaviour and attitudes: a survey among general practitioners practicing in northern Thailand.
2005 Jun 23
Effects of enzyme inducers and inhibitors on the pharmacokinetics of intravenous ipriflavone in rats.
2006 Apr
Catanionic mixtures involving a drug: a rather general concept that can be utilized for prolonged drug release from gels.
2006 Apr
Long QT syndrome in a patient with allergic rhinoconjunctivitis and auto-immune diabetes: focus on the choice of anti-H1 drugs.
2006 Dec
Effects of enzyme inducers and inhibitors on the pharmacokinetics of intravenous omeprazole in rats.
2006 Jul
Pharmacokinetic study of orphenadrine using high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS).
2006 Jul 24
Restless legs syndrome: diagnosis and review of management options.
2006 Jun
A phase II trial of a biweekly combination of paclitaxel and gemcitabine in metastatic breast cancer.
2006 May 24
Epirubicin/paclitaxel/etoposide in extensive-stage small-cell lung cancer: a phase I-II study.
2006 May 8
OPC-67683, a nitro-dihydro-imidazooxazole derivative with promising action against tuberculosis in vitro and in mice.
2006 Nov
Effects of enzyme inducers and inhibitors on the pharmacokinetics of metformin in rats: involvement of CYP2C11, 2D1 and 3A1/2 for the metabolism of metformin.
2006 Oct
Efficacy and safety of combined piroxicam, dexamethasone, orphenadrine, and cyanocobalamin treatment in mandibular molar surgery.
2006 Sep
Acute adverse cutaneous reaction after the concomitant use of venlafaxine and orphenadrine citrate plus paracetamol in a depressed patient.
2006 Sep
Propofol metabolism is enhanced after repetitive ketamine administration in rats: the role of cytochrome P-450 2B induction.
2006 Sep
Anticholinergic drug-induced delirium in an elderly Alzheimer's dementia patient.
2007
Characterization of antihistamine-human serum protein interactions by capillary electrophoresis.
2007 Apr 20
Enantiomeric quality control of antihistamines in pharmaceuticals by affinity electrokinetic chromatography with human serum albumin as chiral selector.
2007 Jun 5
Parkinson's disease and dopaminergic therapy--differential effects on movement, reward and cognition.
2008 Aug
Effect of warnings in a medical journal on the use of orphenadrine.
2008 Aug
Pharmacokinetic, metabolism and withdrawal time of orphenadrine in camels (Camelus dromedarius) after intravenous administration.
2008 Dec
Are there alternatives to the use of quinine to treat nocturnal leg cramps?
2008 Feb
Characterization of aconitine-induced block of delayed rectifier K+ current in differentiated NG108-15 neuronal cells.
2008 May
Demographics of toxic exposures presenting to three public hospital emergency departments in Singapore 2001-2003.
2009 Apr
Involvement of voltage-gated sodium channels blockade in the analgesic effects of orphenadrine.
2009 Apr
The use of antipsychotic and anticholinergic antiparkinson drugs in Norway after the withdrawal of orphenadrine.
2009 Aug
Evaluation of luciferin-isopropyl acetal as a CYP3A4 substrate for human hepatocytes: effects of organic solvents, cytochrome P450 (P450) inhibitors, and P450 inducers.
2009 Aug
The use and potential abuse of anticholinergic antiparkinson drugs in Norway: a pharmacoepidemiological study.
2009 Feb
Effects of cytochrome P450 inducers and inhibitors on the pharmacokinetics of intravenous furosemide in rats: involvement of CYP2C11, 2E1, 3A1 and 3A2 in furosemide metabolism.
2009 Jan
Fixed drug eruption resulting from fluconazole use: a case report.
2009 Jul 6
Drugs associated with more suicidal ideations are also associated with more suicide attempts.
2009 Oct 2
Pharmacokinetics of mirodenafil, a new erectogenic, and its metabolite, SK3541, in rats: involvement of CYP1A1/2, 2B1/2, 2D subfamily, and 3A1/2 for the metabolism of both mirodenafil and SK3541.
2010
Orphenadrinium picrate.
2010 Dec 18
Orphenadrinium picrate picric acid.
2010 Feb 24
(2-Methyl-phen-yl)(phen-yl)methanol.
2010 Jul 31
7-Benzyloxyresorufin-O-dealkylase activity as a marker for measuring cytochrome P450 CYP3A induction in mouse liver.
2010 Mar 1
Opiate sparing effect of fixed combination of diclophenac and orphenadrine after unilateral total hip arthroplasty: A double-blind, randomized, placebo-controlled, multi-centre clinical trial.
2010 Nov
Profiling of a prescription drug library for potential renal drug-drug interactions mediated by the organic cation transporter 2.
2011 Jul 14
Patents

Patents

Sample Use Guides

Acute musculoskeletal conditions: 100 mg orally twice a day (morning and evening) or 60 mg by intramuscular or intravenous injection. May repeat every 12 hours. Quinine-resistant leg cramps: 100 mg orally at bedtime.
Route of Administration: Other
In Vitro Use Guide
An aliquot (400 mkl) of the brain membrane suspension (0.14 mg of protein), 100 mkl of (-)3H-QNB (0.95 nM) (specific activity 46 Ci/mmol), and 50 mk1 of the competing drugs at various concentrations were preincubated for 10 min. and thereafter incubated for 60 min. at 25C in 50 mM Tris-HC1 buffer (PH 7.4). When binding to heart and lung membranes was studied, 500 nkl of homogenate (protein contents were 0.58 mg and 0.54 mg of rat heart and lung tissue and 0.63 mg of guinea pig lung tissue was added to tubes containing 500 mkl of 50 mM Tris-HC1 buffer (PH 7.4), 100 mk1 of (-)3H-QNB (final concentration 0.4 nM) and 100 mkl of buffer (total binding) or unlabeled Orphenadrine.
Name Type Language
ORPHENADRINE CITRATE
EP   MART.   MI   ORANGE BOOK   USP   USP-RS   VANDF   WHO-DD  
Common Name English
ORPHENADRINE CITRATE COMPONENT OF ORPHENGESIC
Common Name English
ORPHENADRINE DIHYDROGEN CITRATE
Common Name English
ORPHENADRINE CITRATE COMPONENT OF INVAGESIC FORTE
Common Name English
ORPHENGESIC FORTE COMPONENT ORPHENADRINE CITRATE
Common Name English
NORFLEX
Brand Name English
(±)-N,N-DIMETHYL-2-((O-METHYL-.ALPHA.-PHENYLBENZYL)OXY)ETHYLAMINE CITRATE (1:1)
Common Name English
INVAGESIC FORTE COMPONENT ORPHENADRINE CITRATE
Common Name English
ORPHENADRINE CITRATE [ORANGE BOOK]
Common Name English
ORPHENADRINE CITRATE [MART.]
Common Name English
ORPHENADRINE CITRATE COMPONENT OF NORGESIC
Common Name English
ORPHENADRINE CITRATE [EP MONOGRAPH]
Common Name English
ORPHENGESIC COMPONENT ORPHENADRINE CITRATE
Common Name English
ORPHENADRINE CITRATE [MI]
Common Name English
ORPHENADRINE CITRATE [VANDF]
Common Name English
INVAGESIC COMPONENT ORPHENADRINE CITRATE
Common Name English
NSC-757238
Code English
ORPHENADRINE CITRATE [USP MONOGRAPH]
Common Name English
Orphenadrine citrate [WHO-DD]
Common Name English
ETHANAMINE, N,N-DIMETHYL-2-((2-METHYLPHENYL)PHENYLMETHOXY)-, (±)-, 2-HYDROXY-1,2,3-PROPANETRICARBOXYLATE (1:1)
Systematic Name English
ORPHENADRINE CITRATE COMPONENT OF ORPHENGESIC FORTE
Common Name English
ORPHENADRINE CITRATE [EP IMPURITY]
Common Name English
ORPHENADRINE CITRATE COMPONENT OF INVAGESIC
Common Name English
BANFLEX
Common Name English
NORGESIC COMPONENT ORPHENADRINE CITRATE
Common Name English
Classification Tree Code System Code
WHO-ATC M03BC01
Created by admin on Fri Dec 15 17:06:08 GMT 2023 , Edited by admin on Fri Dec 15 17:06:08 GMT 2023
NCI_THESAURUS C29696
Created by admin on Fri Dec 15 17:06:08 GMT 2023 , Edited by admin on Fri Dec 15 17:06:08 GMT 2023
Code System Code Type Description
ECHA (EC/EINECS)
225-137-5
Created by admin on Fri Dec 15 17:06:08 GMT 2023 , Edited by admin on Fri Dec 15 17:06:08 GMT 2023
PRIMARY
DRUG BANK
DBSALT000400
Created by admin on Fri Dec 15 17:06:08 GMT 2023 , Edited by admin on Fri Dec 15 17:06:08 GMT 2023
PRIMARY
DAILYMED
X0A40N8I4S
Created by admin on Fri Dec 15 17:06:08 GMT 2023 , Edited by admin on Fri Dec 15 17:06:08 GMT 2023
PRIMARY
CHEBI
7790
Created by admin on Fri Dec 15 17:06:08 GMT 2023 , Edited by admin on Fri Dec 15 17:06:08 GMT 2023
PRIMARY
SMS_ID
100000092072
Created by admin on Fri Dec 15 17:06:08 GMT 2023 , Edited by admin on Fri Dec 15 17:06:08 GMT 2023
PRIMARY
RXCUI
7716
Created by admin on Fri Dec 15 17:06:08 GMT 2023 , Edited by admin on Fri Dec 15 17:06:08 GMT 2023
PRIMARY RxNorm
ChEMBL
CHEMBL900
Created by admin on Fri Dec 15 17:06:08 GMT 2023 , Edited by admin on Fri Dec 15 17:06:08 GMT 2023
PRIMARY
PUBCHEM
20846
Created by admin on Fri Dec 15 17:06:08 GMT 2023 , Edited by admin on Fri Dec 15 17:06:08 GMT 2023
PRIMARY
NCI_THESAURUS
C47641
Created by admin on Fri Dec 15 17:06:08 GMT 2023 , Edited by admin on Fri Dec 15 17:06:08 GMT 2023
PRIMARY
CAS
4724-58-7
Created by admin on Fri Dec 15 17:06:08 GMT 2023 , Edited by admin on Fri Dec 15 17:06:08 GMT 2023
NON-SPECIFIC STOICHIOMETRY
RS_ITEM_NUM
1479009
Created by admin on Fri Dec 15 17:06:08 GMT 2023 , Edited by admin on Fri Dec 15 17:06:08 GMT 2023
PRIMARY
CAS
4682-36-4
Created by admin on Fri Dec 15 17:06:08 GMT 2023 , Edited by admin on Fri Dec 15 17:06:08 GMT 2023
PRIMARY
MERCK INDEX
m8245
Created by admin on Fri Dec 15 17:06:08 GMT 2023 , Edited by admin on Fri Dec 15 17:06:08 GMT 2023
PRIMARY Merck Index
EPA CompTox
DTXSID8044678
Created by admin on Fri Dec 15 17:06:08 GMT 2023 , Edited by admin on Fri Dec 15 17:06:08 GMT 2023
PRIMARY
EVMPD
SUB03546MIG
Created by admin on Fri Dec 15 17:06:08 GMT 2023 , Edited by admin on Fri Dec 15 17:06:08 GMT 2023
PRIMARY
FDA UNII
X0A40N8I4S
Created by admin on Fri Dec 15 17:06:08 GMT 2023 , Edited by admin on Fri Dec 15 17:06:08 GMT 2023
PRIMARY
NSC
757238
Created by admin on Fri Dec 15 17:06:08 GMT 2023 , Edited by admin on Fri Dec 15 17:06:08 GMT 2023
PRIMARY