Can I use Agnus Castus with a Mirena IUS?
All the information online re agnus castus and contraception refers specifically to oral contraceptives. You need to ask your doctor this question, or a pharmacist. Contraindications 1) Caution is appropriate with some age groups and conditions due to the hormonal regulating effects of this herb. 2) There is speculation that this herb may interfere with the efficiency of the birth control pill due to its hormonal regulating activity, however empirical knowledge does not confirm this.