Dingkundan may cause constipation. Ding Kun Dan is a proprietary Chinese medicine composed of ginseng, antler velvet, crocus sativus, chickweed vine, panax ginseng, white peony, radix Rehmanniae Praeparata, angelica sinensis, Rhizoma Atractylodis Macrocephalae, wolfberry, astragalus, Rhizoma Ligustici Chuanxiong, deer antler cream, Colla Corii Asini, and Yan Hu Suo, which is known for nourishing the qi and blood and regulating the menstruation to soothe the body. Contraindications and adverse effects of the drug are not clear. Most of the drugs in the formula belong to warm tonic drugs, which can cause constipation if too much or improper use leads to excessive internal fire. If constipation or bloating occurs while taking Dingkundan, it is recommended to suspend use or reduce the dosage. If the symptoms are not relieved, it is recommended to go to the hospital under the guidance of a specialist to adjust the drug, standardized medication.