Absorption, Distribution and Excretion
Well absorbed in the digestive tract.
ULTIMATE SOJOURN OF PHENOTHIAZINE DRUGS IN BODY IS EXCEEDINGLY LONG. SIX MO AFTER DISCONTINUATION OF THESE DRUGS, VARIOUS METABOLITES ARE DETECTABLE IN URINE. /PHENOTHIAZINES/

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Metabolism / Metabolites
Hepatic
YIELDS 10-(3-DIMETHYLAMINO-2-METHYLPROPYL)PHENOTHIAZINE SULFOXIDE AND 10-(3-METHYLAMINO-2-METHYLPROPYL)PHENOTHIAZINE IN RAT; HEWICK, DS, & BECKETT, AH, BIOCHEM J, 122, 56P (1971). /FROM TABLE/
METABOLIZED PRIMARILY BY THE LIVER. HEPATIC METABOLIC REACTIONS INCLUDE OXIDATION, HYDROXYLATION, DEMETHYLATION, SULFOXIDE FORMATION AND CONJUGATION WITH GLUCURONIC ACID, METABOLIC ALTERATIONS IN THE SIDE CHAIN MAY ALSO OCCUR /HUMAN, ORAL/. /TARTRATE/

Interactions
...MARKEDLY ENHANCES RESPIRATORY DEPRESSION PRODUCED BY MEPERIDINE. ENHANCEMENT OF EFFECTS OF VARIETY OF DRUGS, PARTICULARLY CNS DEPRESSANTS, IS NOT DUE TO INHIBITION OF HEPATIC MICROSOMAL ENZYMES. IN FACT, PHENOTHIAZINES PROMOTE INDUCTION OF THESE ENZYMES. /PHENOTHIAZINES/
MAY INCR TOXICITY OF ORGANOPHOSPHORUS OR OTHER ACETYLCHOLINESTERASE INHIBITORS & PROCAINE. DO NOT USE EPINEPHRINE TO COMBAT ITS HYPOTENSIVE OR DEPRESSANT EFFECTS AS IT POTENTIATES THEM.
POSSIBILITY OF SEVERE HYPOTHERMIA...IN PATIENTS RECEIVING /CONCOMITANT/ ANTIPYRETIC THERAPY...ADDITIVE WITH, OR MAY POTENTIATE, ACTION OF CNS DEPRESSANTS...ATROPINE, HYPOTENSIVE AGENTS, NARCOTICS, BARBITURATES...OTHER SEDATIVES, ANESTHETICS, TRANQUILIZERS...ALCOHOL. /TARTRATE/

[1]. Bioanalytical method development and validation of alimemazine in human plasma by LC-MS/MS and its application in bioequivalence studies. J Pharm Bioallied Sci. 2013 Oct;5(4):257-64.

[2]. Trimeprazine increases IRS2 in human islets and promotes pancreatic β cell growth and function in mice. JCI Insight. 2016;1(3).

Trimeprazine is a member of phenothiazines.
A phenothiazine derivative that is used as an antipruritic.
A phenothiazine derivative that is used as an antipruritic.
See also: Trimeprazine Tartrate (annotation moved to).

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Drug Indication
Used to prevent and relieve allergic conditions which cause pruritus (itching) and urticaria (some allergic skin reactions).

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Mechanism of Action
Trimeprazine competes with free histamine for binding at HA-receptor sites. This antagonizes the effects of histamine on HA-receptors, leading to a reduction of the negative symptoms brought on by histamine HA-receptor binding.

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Therapeutic Uses
Antipruritics
ITS TRANQUILIZING PROPERTIES ARE OF LOW ORDER... /TARTRATE/
IT IS CONSIDERED EFFECTIVE FOR USE IN TREATMENT OF PRURITIC SYMPTOMS DUE TO URTICARIA; PROBABLY EFFECTIVE FOR SYMPTOMATIC RELIEF IN MGMNT OF NASAL ALLERGIES; & POSSIBLY EFFECTIVE FOR PROLONGED RELIEF OF PRURITIC SYMPTOMS IN VARIETY OF ALLERGIC & NONALLERGIC CONDITIONS... /TARTRATE/
...POSSIBLY EFFECTIVE FOR PROLONGED RELIEF OF PRURITIC SYMPTOMS...INCL NEURODERMATITIS, CONTACT DERMATITIS, PITYRIASIS ROSEA, POISON IVY DERMATITIS, ECZEMATOUS DERMATITIS, PRURITUS ANI & VULVAE, DRUG RASH & CHICKENPOX... /TARTRATE/
For more Therapeutic Uses (Complete) data for TRIMEPRAZINE (8 total), please visit the HSDB record page.

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Drug Warnings
SIDE EFFECTS ARE OFTEN EXTENSIONS OF MANY PHARMACOLOGICAL ACTIONS OF DRUGS... MOST IMPORTANT ARE THOSE ON CNS, CARDIOVASCULAR SYSTEM, AUTONOMIC NERVOUS SYSTEM, & ENDOCRINE FUNCTIONS. ... MOST DANGEROUS EFFECTS...ARE THOSE RESULTING FROM HYPERSENSITIVITY REACTIONS, PARTICULARLY BLOOD DYSCRASIAS. /PHENOTHIAZINES/
SEDATION & MILD TRANQUILIZATION ALSO OCCUR. SYMPTOMS OF OVERDOSAGE ARE DIZZINESS...AND CENTRAL DEPRESSION LEADING TO COMA.
VET: AVOID RAPID IV & INTRAARTERIAL INJECTIONS /IN ANIMALS/.
DROWSINESS MOST COMMON REACTION. ALL PRECAUTIONS APPLICABLE TO PHENOTHIAZINES SHOULD BE OBSERVED. /TARTRATE/
For more Drug Warnings (Complete) data for TRIMEPRAZINE (9 total), please visit the HSDB record page.

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Pharmacodynamics
Trimeprazine (also known as Alimemazine) is a tricyclic antihistamine, similar in structure to the phenothiazine antipsychotics, but differing in the ring-substitution and chain characteristics. Trimeprazine is in the same class of drugs as chlorpromazine (Thorazine) and trifluoperazine (Stelazine); however, unlike the other drugs in this class, trimeprazine is not used clinically as an anti-psychotic. It acts as an anti-histamine, a sedative, and an anti-emetic (anti-nausea). Trimeprazine is used principally as an anti-emetic, to prevent motion sickness or as an anti-histamine in combination with other medications in cough and cold preparations. Tricyclic antihistamines are also structurally-related to the tricyclic antidepressants, explaining the antihistaminergic adverse effects of these two drug classes and also the poor tolerability profile of tricyclic H₁-antihistamines.

C18H22N2S

298.45

298.15

84-96-8

Alimemazine-d6;1346603-88-0

5574

CRYSTALS

1.203 g/cm3

420.3ºC at 760mmHg

68°C

208ºC

4.552

0

3

4

21

311

0

CC(CN(C)C)CN1C2=CC=CC=C2SC3=CC=CC=C31

ZZHLYYDVIOPZBE-UHFFFAOYSA-N

InChI=1S/C18H22N2S/c1-14(12-19(2)3)13-20-15-8-4-6-10-17(15)21-18-11-7-5-9-16(18)20/h4-11,14H,12-13H2,1-3H3

N,N,2-trimethyl-3-phenothiazin-10-ylpropan-1-amine

2934.99.9001

Powder      -20°C    3 years

                     4°C     2 years

In solvent   -80°C    6 months

                  -20°C    1 month

Room temperature (This product is stable at ambient temperature for a few days during ordinary shipping and time spent in Customs)

May dissolve in DMSO (in most cases), if not, try other solvents such as H2O, Ethanol, or DMF with a minute amount of products to avoid loss of samples

Note: Listed below are some common formulations that may be used to formulate products with low water solubility (e.g. < 1 mg/mL), you may test these formulations using a minute amount of products to avoid loss of samples.

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Injection Formulation 1: DMSO : Tween 80： Saline = 10 : 5 : 85 (i.e. 100 μL DMSO stock solution → 50 μL Tween 80 → 850 μL Saline)
*Preparation of saline: Dissolve 0.9 g of sodium chloride in 100 mL ddH ₂ O to obtain a clear solution.
Injection Formulation 2: DMSO : PEG300 ：Tween 80 : Saline = 10 : 40 : 5 : 45 (i.e. 100 μL DMSO → 400 μLPEG300 → 50 μL Tween 80 → 450 μL Saline)
Injection Formulation 3: DMSO : Corn oil = 10 : 90 (i.e. 100 μL DMSO → 900 μL Corn oil)
Example: Take the Injection Formulation 3 (DMSO : Corn oil = 10 : 90) as an example, if 1 mL of 2.5 mg/mL working solution is to be prepared, you can take 100 μL 25 mg/mL DMSO stock solution and add to 900 μL corn oil, mix well to obtain a clear or suspension solution (2.5 mg/mL, ready for use in animals).

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Injection Formulation 4: DMSO : 20% SBE-β-CD in saline = 10 : 90 [i.e. 100 μL DMSO → 900 μL (20% SBE-β-CD in saline)]
*Preparation of 20% SBE-β-CD in Saline (4°C，1 week): Dissolve 2 g SBE-β-CD in 10 mL saline to obtain a clear solution.
Injection Formulation 5: 2-Hydroxypropyl-β-cyclodextrin : Saline = 50 : 50 (i.e. 500 μL 2-Hydroxypropyl-β-cyclodextrin → 500 μL Saline)
Injection Formulation 6: DMSO : PEG300 : castor oil : Saline = 5 : 10 : 20 : 65 (i.e. 50 μL DMSO → 100 μLPEG300 → 200 μL castor oil → 650 μL Saline)
Injection Formulation 7: Ethanol : Cremophor : Saline = 10： 10 : 80 (i.e. 100 μL Ethanol → 100 μL Cremophor → 800 μL Saline)
Injection Formulation 8: Dissolve in Cremophor/Ethanol (50 : 50), then diluted by Saline
Injection Formulation 9: EtOH : Corn oil = 10 : 90 (i.e. 100 μL EtOH → 900 μL Corn oil)
Injection Formulation 10: EtOH : PEG300：Tween 80 : Saline = 10 : 40 : 5 : 45 (i.e. 100 μL EtOH → 400 μLPEG300 → 50 μL Tween 80 → 450 μL Saline)

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Oral Formulation 1: Suspend in 0.5% CMC Na (carboxymethylcellulose sodium)
Oral Formulation 2: Suspend in 0.5% Carboxymethyl cellulose
Example: Take the Oral Formulation 1 (Suspend in 0.5% CMC Na) as an example, if 100 mL of 2.5 mg/mL working solution is to be prepared, you can first prepare 0.5% CMC Na solution by measuring 0.5 g CMC Na and dissolve it in 100 mL ddH2O to obtain a clear solution; then add 250 mg of the product to 100 mL 0.5% CMC Na solution, to make the suspension solution (2.5 mg/mL, ready for use in animals).

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Oral Formulation 3: Dissolved in PEG400
Oral Formulation 4: Suspend in 0.2% Carboxymethyl cellulose
Oral Formulation 5: Dissolve in 0.25% Tween 80 and 0.5% Carboxymethyl cellulose
Oral Formulation 6: Mixing with food powders

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Note: Please be aware that the above formulations are for reference only. InvivoChem strongly recommends customers to read literature methods/protocols carefully before determining which formulation you should use for in vivo studies, as different compounds have different solubility properties and have to be formulated differently.

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 (Please use freshly prepared in vivo formulations for optimal results.)