Cilostazol (Cilostazole) — Patient Information

Cilostazol is a medicine used to improve walking ability in certain people with reduced blood flow to the legs. It belongs to a group of drugs known as antiplatelet and vasodilator agents. This page explains what cilostazol does, how it works, how it’s taken, common precautions, and practical tips for safe use in Australia.

Always read the Consumer Medicine Information (CMI) supplied with your product and follow your healthcare professional’s advice. If you have questions about your personal situation, seek professional guidance.

Key product information

What is cilostazol used for?

Cilostazol is used to improve walking distance and symptoms in people with peripheral arterial disease (PAD), especially when this causes intermittent claudication.

Intermittent claudication is pain, cramping, or discomfort in the legs that happens when walking or exercising and eases with rest. It occurs due to reduced blood flow to the leg muscles.

Important: Cilostazol is not a treatment for a sudden blockage. It aims to reduce symptoms and improve walking function over time.

Mechanism of action (how cilostazol works)

Cilostazol affects blood flow and clotting pathways in several ways:

• Antiplatelet effect: It reduces platelet aggregation (clumping) by increasing levels of a cellular messenger called cAMP (cyclic adenosine monophosphate).
• Vasodilation: It relaxes blood vessel walls, helping improve circulation to tissues.
• Improved microcirculation: By enhancing blood flow, it may help deliver oxygen and nutrients to exercising muscles.

The combined effects can lead to improved walking tolerance in people with PAD.

Pharmacokinetics (what the body does with the medicine)

Pharmacokinetics describes how cilostazol is absorbed, processed, and eliminated.

• Absorption: Cilostazol is absorbed after oral dosing. Peak blood levels typically occur within a few hours (exact timing can vary by formulation and individual factors).
• Distribution: It distributes into tissues throughout the body.
• Metabolism: Cilostazol is metabolised mainly in the liver. It forms active and less active metabolites.
• Elimination: Metabolites are cleared largely via the kidneys and partly via other routes. The medicine’s activity may last longer than the initial tablet effect due to metabolites.

Because cilostazol is metabolised by liver enzymes (notably involving the CYP family), drug interactions can be important—see the sections on food and medicine interactions below.

Indications (who may benefit)

Cilostazol is indicated for improving symptoms of intermittent claudication in people with PAD.

It may be considered when:

• Leg pain occurs with walking due to reduced arterial blood flow
• Improving walking distance is a treatment goal alongside risk-factor management (e.g., smoking cessation, exercise programs, and cardiovascular prevention strategies)

Whether cilostazol is suitable depends on your medical history, especially conditions affecting the heart and contraindicated medicines you may take.

How to take cilostazol (timing and dosing)

Always follow the dosing instructions provided with your product or by your healthcare professional. Doses can vary based on individual factors and tolerability.

Typical dosing pattern

• Common schedule: Often twice daily (e.g., morning and evening, roughly 12 hours apart).
• Strength: Many patients are prescribed 100 mg twice daily, though some may use 50 mg depending on tolerability and interaction risk.

Timing tip: Choose a routine you can maintain daily (for example, with breakfast and with dinner). Consistency helps maintain steadier drug levels.

How long does it take to work?

Some people notice improvement after a few weeks, but meaningful benefit may take several weeks of consistent use. If you don’t notice any improvement, talk with your healthcare professional rather than stopping abruptly.

Missed dose

• If you miss a dose, take it when you remember unless it’s close to the next scheduled dose.
• Do not take a double dose to make up for the missed one.

Food interactions and what to eat

Cilostazol can generally be taken with or without food, but certain considerations may help reduce stomach discomfort.

• With meals: Taking cilostazol with food or just after a meal may help if you experience stomach upset.
• Consistency matters: Try to keep your usual approach (with meals or without) stable from day to day.

Food can influence absorption for some medicines; if your product pack instructions advise a specific method (e.g., with water after food), follow that guidance.

Alcohol interactions

Alcohol does not typically have a single direct “always unsafe” interaction with cilostazol, but combining alcohol with any medicine that affects the cardiovascular system or causes dizziness can increase risk.

• Possible effects: Alcohol can worsen dizziness, light-headedness, and headaches.
• Practical advice: If you’re starting cilostazol or increasing your dose, consider avoiding alcohol for the first few days to gauge side effects.

If you have liver disease or heavy alcohol intake, discuss cilostazol suitability with a healthcare professional, as liver metabolism may be affected.

Medicine interactions (important safety topic)

Drug interactions can alter how cilostazol works or increase side effects. Some combinations may require dose changes or extra monitoring.

Common interaction themes

• Medicines that affect liver enzymes (CYP): Some drugs can increase cilostazol levels, raising the risk of side effects. Others can reduce its effectiveness.
• Other blood-thinning or antiplatelet medicines: Since cilostazol affects platelet function, combining it with other agents that increase bleeding risk may raise the chance of bruising or bleeding.
• Blood pressure and heart rhythm medicines: Cilostazol can influence circulation, and some combinations may require caution.

Examples of medicines to discuss with your pharmacist/doctor

• Strong enzyme inhibitors (for example, some antifungal medicines such as ketoconazole/itraconazole, and certain antibiotics like clarithromycin) may increase cilostazol concentration.
• Other antiplatelet/anticoagulant therapies (e.g., aspirin, clopidogrel, warfarin, rivaroxaban, apixaban) may increase bleeding tendency—your clinician will assess the benefit–risk balance.
• Medicines for blood pressure (antihypertensives) may contribute to dizziness or low blood pressure when combined.
• Other heart medicines, especially those affecting rhythm, should be reviewed to reduce risk.

This list is not exhaustive. Tell your healthcare professional about all medicines you take, including over-the-counter products, vitamins, herbal supplements (e.g., St John’s wort), and any recent changes.

Safety profile and side effects

Like all medicines, cilostazol can cause side effects. Many are mild and settle after the body adjusts, but some require urgent attention.

Common side effects

• Headache
• Dizziness or light-headedness
• Palpitations (awareness of heartbeat)
• Flushing or feeling warm
• Gastrointestinal symptoms such as nausea, diarrhoea, or indigestion

Less common but important

• Bruising more easily or unexpected bleeding
• Rash or itching
• Changes in blood counts (rare; may present as persistent infection, unusual fatigue, or bleeding)

Seek urgent medical help if you notice

• Black, tarry stools or blood in stool
• Vomiting blood or coughing blood
• Unusual severe bruising or bleeding that won’t stop
• Chest pain, fainting, or severe breathlessness
• Severe allergic reaction symptoms (swelling of face/lips, difficulty breathing)

Who should avoid cilostazol (contraindications and cautions)

Cilostazol may not be suitable for everyone. The key safety concerns include heart-related conditions and bleeding risk.

• Heart failure: Cilostazol is generally not recommended for people with heart failure (especially certain classes or when heart failure is present). Discuss your heart history with a clinician.
• Bleeding risk: People with active bleeding, bleeding disorders, or high bleeding risk should be assessed carefully.
• Liver impairment: Because cilostazol is metabolised in the liver, impaired liver function may affect medicine levels.
• Kidney impairment: Dose adjustments or extra caution may be needed depending on severity.

If you have any of the above conditions, your pharmacist can help you review whether cilostazol is appropriate.

Practical use tips (getting the best results)

1) Combine medicine with lifestyle measures

Cilostazol works best as part of overall management of PAD. Consider:

• Supervised or structured exercise (when available). Walking programs often improve symptoms over time.
• Smoking cessation if you smoke—this is one of the most important steps for PAD.
• Cardiovascular risk control (blood pressure, cholesterol, and diabetes management if relevant).

2) Track your walking ability

To monitor progress, note:

• How far you can walk before leg pain starts
• How quickly symptoms improve with rest
• Any day-to-day pattern related to activity or footwear

3) Be careful when you first start

• If you feel dizzy, sit or stand up slowly.
• Avoid driving or operating machinery if you’re experiencing dizziness until you know how the medicine affects you.

4) Manage stomach upset

• Take with food if that helps your comfort.
• Stay hydrated and monitor symptoms—contact your pharmacist if diarrhoea is persistent or severe.

5) Don’t “double up” doses

If you miss a dose, follow the missed-dose advice. Taking extra tablets increases side-effect risk.

Alternative options for intermittent claudication

Depending on your condition and medical history, other approaches may be considered alongside or instead of cilostazol. Your clinician can discuss what fits your health needs.

Medication and non-medication alternatives

• Exercise therapy: structured walking programs are often a first-line recommendation for symptom improvement.
• Antiplatelet therapy (e.g., aspirin or clopidogrel): may be used to reduce cardiovascular event risk in PAD, though it’s different from cilostazol’s walking symptom goal.
• Other vascular risk medicines: statins and blood pressure medicines help overall vascular health.
• Revascularisation procedures: in selected cases with significant blockages, vascular specialists may consider procedures such as angioplasty or surgery.

Note: These alternatives have different benefits and risks. The best choice depends on the severity of PAD, symptoms, heart function, and what other medicines you are taking.

Market and legal context in Australia (overview)

Medicines available in Australia are regulated under the Australian regulatory framework, and requirements for supply (including whether a medicine is prescription-only or restricted) depend on the specific product and presentation.

• Regulatory oversight: medicines are assessed for safety, efficacy, and quality before they are permitted for supply.
• Product information: approved Consumer Medicine Information (CMI) and prescribing/clinical guidance help healthcare professionals and patients understand correct use.
• Pharmacist support: pharmacists can advise on interactions, suitability, and practical administration—especially important for medicines affecting platelet function.

Availability may vary by brand and stock levels. If your preferred strength or brand is temporarily unavailable, your pharmacist may be able to source an alternative equivalent (subject to local supply and regulatory rules).

Recent guidance and clinical considerations

Clinical guidance for PAD management can evolve as evidence and safety information is updated. In general:

• Symptom management: cilostazol is used for improving walking symptoms in intermittent claudication in suitable individuals.
• Safety monitoring: clinicians review contraindications—especially heart failure history—and watch for bleeding and tolerability issues.
• Holistic care: PAD management includes exercise, cardiovascular risk reduction, smoking cessation, and medicines to reduce overall cardiovascular risk.

For the most current information relevant to your situation, consult your healthcare professional and refer to the latest approved product information and guidelines.

Delivery and availability (online pharmacy)

Availability can differ depending on stock and brand. When ordering online in Australia:

• Check product strength and form: confirm the tablet strength (e.g., 50 mg or 100 mg) matches your plan.
• Look for approved local packaging: ensure the product listing matches the manufacturer and approved formulation.
• Delivery timelines: dispatch times depend on warehouse location and couriers; estimated delivery windows are provided at checkout or in your order confirmation.
• Cold-chain: most tablet forms do not require refrigeration, but always follow the storage instructions on the pack.

If you have urgent needs (for example, you are about to run out), contact customer support as early as possible to check delivery options.

Storage and handling

• Store at room temperature in a dry place.
• Keep in the original packaging to protect from moisture if recommended on the label.
• Keep out of reach of children.
• Do not use after the expiry date on the carton/blister.

FAQ about cilostazol

1) Is cilostazol used for heart disease?

Cilostazol is mainly used to improve walking symptoms in peripheral arterial disease (intermittent claudication). It is not the same as medicines used for heart attacks or strokes.

2) How quickly will I feel improvement?

Some people notice changes within a few weeks, but it may take several weeks to see the full benefit. Consistent daily use helps.

3) Can I take cilostazol with other blood-thinning medicines?

Sometimes it may be used alongside other therapies, but the combination can raise bleeding risk. You must discuss your full medication list with a healthcare professional or pharmacist to check safety.

4) What if I get bruising or bleeding?

Mild bruising may occur, but unusual bleeding (gums, nosebleeds, blood in stool/urine, or severe bruising) should be reviewed promptly. Seek urgent help for significant bleeding.

5) Does cilostazol cause dizziness?

Dizziness is a common side effect. Be cautious with driving or climbing stairs until you know how you respond.

6) Can I drink alcohol while taking cilostazol?

Moderate alcohol may be acceptable for some people, but alcohol can worsen dizziness and increase health risks. If you’re unsure, ask your pharmacist. Avoid heavy drinking, and be especially cautious when starting treatment.

7) What foods should I avoid?

There are no widely required food restrictions for cilostazol for most people. Taking it consistently with food or after meals can help reduce stomach upset.

8) Is cilostazol safe if I have liver or kidney problems?

Caution may be needed because cilostazol is metabolised in the liver and cleared through the body in part via the kidneys. Your clinician may adjust dose or monitor you more closely.

9) What should I do if I miss a dose?

Take the missed dose when you remember unless it’s close to your next dose. Don’t take a double dose.

10) What are the main alternatives?

Alternatives include structured exercise programs, cardiovascular risk medicines (depending on your health profile), and in some cases procedural options for severe blockages. Your healthcare professional can help choose the most appropriate plan.

Need help? If you’d like, share (1) your age range, (2) your current medicines (including over-the-counter and supplements), and (3) any history of heart failure, bleeding, liver disease, or kidney problems with your pharmacist—this helps ensure cilostazol is used safely.