Lonopin is an enoxaparin injection, which is a type of blood thinner sometimes used during IVF treatment in selected patients. It is not given to everyone undergoing IVF, but doctors may prescribe it when there is concern about increased blood clotting, repeated implantation failure, recurrent miscarriages, certain autoimmune conditions, or clotting disorders that may affect blood flow to the developing pregnancy. The idea behind using it is to improve circulation to the uterus and reduce tiny clot formation that could interfere with embryo implantation or early pregnancy support. In many IVF cases, Lonopin is started after embryo transfer or once pregnancy is confirmed, and the dose and duration depend completely on the patient's medical history, weight, and test results. Because it affects blood clotting, it must be used very carefully and only under a fertility specialist's supervision. Common side effects can include bruising, injection-site pain, or bleeding tendency in some people. Regular follow-up during IVF is important because fertility specialists often adjust medicines based on scan findings, hormone levels, and overall pregnancy progress.