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Cilostazol

Cilostazol Side Effects

Allison Gourley, PharmDDaisy Chau, PharmD
Reviewed by Allison Gourley, PharmD, Daisy Chau, PharmD
Last reviewed on May 21, 2025

The following side effects may get better over time as your body gets used to the medication. Let your healthcare provider know immediately if you continue to experience these symptoms or if they worsen over time.

Common Side Effects

  • Headache (34%)
  • Diarrhea (19%)
  • Abnormal stools (15%)
  • Heart palpitations (10%)
  • Dizziness (10%)
  • Sore throat (10%)
  • Infection (10%)

Less Common Side Effects

  • Swelling in your legs or feet
  • Stuffy nose
  • Indigestion
  • Stomach pain
  • Fast heartbeat

Cilostazol serious side effects

Contact your healthcare provider immediately if you experience any of the following.

  • Heart problems: fast heartbeat, palpitations, irregular heartbeat, low blood pressure
  • Serious allergic reactions: hives, swollen face or tongue, trouble breathing or wheezing, dizziness

Source: DailyMed

The following Cilostazol side effects have also been reported

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur:

More common

Fast or irregular heartbeat

fever

Less common

Abnormal bleeding

bloody or black tarry stools

bruises or red spots on the skin

fainting

nausea, heartburn, or indigestion (severe or continuing)

nosebleeds

stiff neck

stomach pain, cramping, or burning (severe)

swelling of the tongue

vomiting of blood or material that looks like coffee grounds

Incidence not known

Bleeding gums

bleeding tendency

blistering, peeling, loosening of the skin

blood in the urine or stools

blurred vision

chest pain

chills

clay-colored stools

confusion

cough or hoarseness

coughing up blood

dark urine

diarrhea

difficulty with breathing

drowsiness

fever with or without chills

general feeling of tiredness or weakness

headache, sudden and severe

inability to speak

itching of the eyes

itching of the skin

joint or muscle pain

light-colored stools

loss of appetite

loss of consciousness

lower back or side pain

nausea and vomiting

painful or difficult urination

pinpoint red spots on the skin

red skin lesions, often with a purple center

red, irritated eyes

seizures

skin rash

slurred speech

sores, ulcers, or white spots on the lips or in the mouth

stomach pain

swollen glands

temporary blindness

unpleasant breath odor

unusual bleeding or bruising

unusual tiredness or weakness

weakness in the arm or leg on one side of the body, sudden and severe

weakness of part of the body

yellow eyes or skin

Get emergency help immediately if any of the following symptoms of overdose occur:

Symptoms of overdose

Dizziness or lightheadedness when getting up suddenly from a lying or sitting position

Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

More common

Back pain

dizziness

gas

headache

increased cough

pain or stiffness in the muscles

pounding heartbeat

runny or stuffy nose

sore throat

swelling of the arms or legs

Less common

Bone pain

burning feeling in the throat or chest

difficulty with swallowing

hives

pain or stiffness in the joints

ringing or buzzing in the ears

swelling of the face, fingers, or lower legs

Incidence not known

Bruising

feeling of warmth

pain

redness of the face, neck, arms and occasionally, upper chest

Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.

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Why trust our experts?

Allison Gourley, PharmD, is a kidney and pancreas transplant pharmacist at a teaching hospital in the San Francisco Bay Area. When she’s not educating patients about their immunosuppressants, she's actively involved in transplant research.
Daisy Chau, PharmD
Reviewed by:
Daisy Chau, PharmD
Daisy Chau, PharmD, is the drug information pharmacist manager at GoodRx. She is licensed in California and has more than 6 years of experience working as a pharmacist in drug information.

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