Tidilan Retard Tablet is used to treat and prevent Raynaud's phenomenon, cerebral vascular insufficiency (poor blood flow to the brain), arteriosclerosis (hardening of the arteries), and other conditions involving poor blood flow in the blood vessels (veins and arteries). Besides this, it is also used to relax uterine muscles to prevent premature labour (when the uterus starts contracting for birth earlier than usual). It contains Isoxsuprine, which relaxes and widens the blood vessels (artery/veins) and muscles (like uterine muscle), thereby increasing the blood flow to the muscles and blocking nerves, delaying contraction in premature labour pains, and poor blood flow to organs and other body parts. In some cases, you may experience side effects such as chest pain (angina), irregular heartbeat, nausea, vomiting, and weakness.