Tamoxifen citrate salt


Empirical Formula (Hill Notation):
C26H29NO · C6H8O7
CAS Number:
Molecular Weight:
EC Number:
MDL number:
PubChem Substance ID:
Pricing and availability is not currently available.




methanol: soluble 50 mg/mL, clear, colorless



storage temp.


SMILES string




InChI key


Gene Information

human ... ESR1(2099), PRKCA(5578), PRKCB(5579), PRKCD(5580), PRKCE(5581), PRKCG(5582), PRKCH(5583), PRKCI(5584)

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Tamoxifen has been used for analyzing its effects on radiation sensitivity and steroid receptor content in human breast cancer cells. It has also been used for studying the accumulation of triacylglycerol in hepatic tissues of female rats. Furthermore, studies have reported that environmental magnetic fields can block antiproliferative functions of tamoxifen in human breast cancer cells.


1, 5 g in glass bottle

Biochem/physiol Actions

Protein kinase C inhibitor. Induces apoptosis in human malignant glioma cell lines. Tamoxifen and its metabolite 4-hydroxytamoxifen are selective estrogen response modifiers (SERMs) that act as estrogen antagonists in mammary gland. Blocks estradiol-stimulated VEGF production in breast tumor cells.

Features and Benefits

This compound was developed by AstraZeneca. To browse the list of other pharma-developed compounds and Approved Drugs/Drug Candidates, click here.
This compound is also offered as part of Sigma′s Library of Pharmacologically Active Compounds (LOPAC®1280), a biologically annotated collection of high-quality, ready-to-screen compounds. Click here to learn more.
This compound is featured on the Nuclear Receptors (Steroids) page of the Handbook of Receptor Classification and Signal Transduction. To browse other handbook pages, click here.
This compound is a featured product for ADME Tox research. Click here to discover more featured ADME Tox products. Learn more about bioactive small molecules for other areas of research at sigma.com/discover-bsm.

Preparation Note

Tamoxifen citrate salt dissolves in methanol at 50 mg/ml to yield a clear, colorless solution.

Legal Information

LOPAC is a registered trademark of Sigma-Aldrich Co. LLC

Signal Word


Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves

Hazard Codes


Risk Statement


Safety Statement



NONH for all modes of transport

WGK Germany


Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

J D Harland et al.
Bioelectromagnetics, 18(8), 555-562 (1997-01-01)
We have previously reported that environmental-level magnetic fields (1.2 microT [12 milligauss], 60 Hz) block the growth inhibition of the hormone melatonin (10(-9) M) on MCF-7 human breast cancer cells in vitro. We now report that the same 1.2 microT...
Oddrun Anita Gudbrandsen et al.
Journal of lipid research, 47(10), 2223-2232 (2006-07-26)
Tamoxifen can induce hepatic steatosis in women. In this study, we wanted to elucidate the mechanism behind the tamoxifen-induced accumulation of triacylglycerol in liver in female rats, and we hoped to prevent this development by combination treatment with the modified...
G H Paulsen et al.
Acta oncologica (Stockholm, Sweden), 35(8), 1011-1019 (1996-01-01)
Possible influences of tamoxifen and estradiol on in vitro radiation sensitivity and cellular receptor content after irradiation and/or tamoxifen treatment were studied in breast cancer cell lines; estrogen receptor (ER) and progesterone receptor (PgR) positive cell lines MCF-7 and MCF-7/TAM(R)-1...
K I Pritchard
Journal of internal medicine, 274(2), 144-152 (2013-07-13)
Hormonal therapy for breast cancer is the first targeted therapy used in any type of cancer. It was used successfully without a known target for more than 50 years before Jensen described the oestrogen receptor (ER) in the 1960s. Subsequently, it...
You-Ying Chau et al.
Nature cell biology, 16(4), 367-375 (2014-03-13)
Fuelled by the obesity epidemic, there is considerable interest in the developmental origins of white adipose tissue (WAT) and the stem and progenitor cells from which it arises. Whereas increased visceral fat mass is associated with metabolic dysfunction, increased subcutaneous...
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