Cilostazol is a phosphodiesterase inhibitor used to improve blood flow and symptoms of intermittent claudication.
Cilostazol belongs to a class of medicines known as phosphodiesterase-3 inhibitors. Its main purpose is to improve blood flow in the legs by preventing platelets from clumping together and by widening small blood vessels. In Hong Kong, cilostazol is the active ingredient found in products such as Pletal and the generic-named Cilostazol tablets.
Both Pletal (the brand name) and the generic Cilostazol tablets contain the same active substance. They are usually supplied as oral tablets, most commonly in 50 mg and 100 mg strengths. The brand version may be marketed by a specific pharmaceutical company, while the generic form is produced by several local and overseas manufacturers that have received approval from the Hong Kong Department of Health. All of these products are taken by mouth and are available on prescription in Hong Kong pharmacies.
Cilostazol is primarily used for the following conditions:
These uses are approved by the Hong Kong regulatory authorities, and the drug is generally intended for adults who have been diagnosed with the above vascular problems.
Cilostazol increases the level of a natural chemical called cyclic AMP inside blood-platelet cells and the lining of blood vessels. Higher cyclic AMP makes platelets less likely to stick together and relaxes the smooth muscle in small arteries. The result is smoother blood flow to the legs and a lower chance of clot formation. Most people notice an improvement in walking ability within a few weeks of regular use, although the exact speed of benefit can vary.
These effects are generally short-lasting and may lessen as the body adjusts to the medication.
If any of these occur, seek emergency medical help right away.
Cilostazol can interact with medicines that affect blood clotting, such as warfarin, and with drugs that also raise cyclic AMP levels, like certain antibiotics (e.g., clarithromycin). Alcohol may increase the risk of dizziness, and grapefruit juice can raise cilostazol levels in the bloodstream. Always review the full interaction list on the specific product’s label or consult a pharmacist for guidance.
Store tablets in a cool, dry place away from direct sunlight and out of reach of children. Most treatments are intended for short-term improvement of walking distance, but some patients may use cilostazol for longer periods under medical supervision. Because each product (Pletal, generic Cilostazol) may have slight differences in excipients or strength, follow the instructions that come with the particular medication you receive. For detailed usage, dosing, and administration, refer to your specific medication’s information.
Platelet aggregation: The process where blood platelets clump together, which can lead to clot formation.
Cyclic AMP: A natural molecule inside cells that helps regulate many functions, including blood vessel relaxation.
Intermittent claudication: Leg pain that appears during walking because of insufficient blood flow.
This article offers general educational information about cilostazol as an active substance used in various medicines. Its purpose is to help patients better understand the ingredient and the conditions it is used to treat. It is not a substitute for professional medical advice or for the specific instructions provided with individual products. Medicines containing cilostazol may differ in formulation, strength, and directions for use. Always consult the labeling of your particular medication and follow your healthcare provider’s guidance for complete information on proper use, dosage, and safety.
