No medicine can ensure the pregnancy of twins, but taking ovulation drugs can increase the chance of pregnancy of twins, such as clomiphene citrate capsule, letrozole tablets and so on. 1. Clomiphene Citrate Capsules: Clomiphene Citrate Capsules is a kind of pro-ovulatory drug, which can treat luteal insufficiency, and can also have a therapeutic effect on women who do not have ovulation. If a woman wants to conceive twins, she can take clomiphene citrate capsules to promote ovulation, and if two mature eggs are discharged at the same time to combine with sperm, twins will be formed. 2. Letrozole tablets: Letrozole tablets are a kind of anti-tumor drugs, for postmenopausal early breast cancer can play an adjuvant therapeutic effect, although it is a kind of anti-tumor drugs, but it can stimulate follicle growth, to achieve the effect of promoting ovulation. In addition, the above drugs may only increase the chances of conceiving twins, but not after taking them, you can get pregnant. When taking the medication, you must follow the doctor’s instructions and not use the medication on your own, so as not to cause adverse effects on the body.