(E/Z)-Droloxifene is a mixture of (E)-droloxifene (a selective estrogen receptor modulator) and (Z)-droloxifene. (E)-Droloxifene binds to the estrogen receptor (ER) with an IC50 value of 24 nM in rabbit uterine homogenates. (E)-Droloxifene increases uterine weight in immature rats, and reduces estradiol-induced increases in uterine weight in juvenile rats. (E)-Droloxifene also inhibits 17β-estradiol-stimulated growth of MCF-7, ZR-75-1, and T47D human breast cancer cells. (Z)-Droloxifene binds weakly to ER and has no estrogenic or antiestrogenic activity.

Providing storage is as stated on the product vial and the vial is kept tightly sealed, the product can be stored for up to 24 months.
Wherever possible, you should prepare and use solutions on the same day. However, if you need to make up stock solutions in advance, we recommend that you store the solution as aliquots in tightly sealed vials at -20°C. Generally, these will be useable for up to one month. Before use, and prior to opening the vial we recommend that you allow your product to equilibrate to room temperature for at least 1 hour.