How Soy Isoflavones interacts with Estrogen and estrogen-like medications

Interaction type: Interactions

Interaction rating: Potential/Theoritical

Soy isoflavones have a mild hormonal-like activity, which may alter the effects of these medications and possibly the dose needed for treatment. If you are a women taking estrogen-containing medications consult with your healthcare professional before beginning to take soy isoflavones. (1)

These drugs include conjugated estrogens, estradiol, estrone, esterified estrogens, estropipate, ethinyl estradiol, raloxifene, transdermal estradiol, vaginal estrogens


  1. View Abstract: Ramsey LA, Ross BS, Fischer RG. Phytoestrogens and the Management of Menopause. Adv Nurse Pract. May1999;7(5):26-30.