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Pharmacological effects Clinical application Side effects Precautions Chemical Properties Uses Production method
Cilostazol structure
Chemical Name:
Molecular Formula:
Formula Weight:
MOL File:

Cilostazol Properties

Melting point:
Boiling point:
499.57°C (rough estimate)
1.1832 (rough estimate)
refractive index 
1.7600 (estimate)
storage temp. 
Store at RT
DMSO: 18 mg/mL, soluble
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
Hazard Codes  Xi
WGK Germany  2
RTECS  VC8277500
HS Code  29339900
Toxicity LD50 in mice, rats (mg/kg): >2000, >2000 i.p.; >5000, >5000 orally (Nomura)
Signal word:
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H315 Causes skin irritation Skin corrosion/irritation Category 2 Warning P264, P280, P302+P352, P321,P332+P313, P362
H319 Causes serious eye irritation Serious eye damage/eye irritation Category 2A Warning P264, P280, P305+P351+P338,P337+P313P
H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning
Precautionary statements:
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P304+P340 IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing.
P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
P405 Store locked up.

Cilostazol price More Price(12)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich C0737 Cilostazol ≥98% (HPLC), powder 73963-72-1 10mg $165 2018-11-20 Buy
Sigma-Aldrich 1134153 Cilostazol United States Pharmacopeia (USP) Reference Standard 73963-72-1 200mg $870 2018-11-13 Buy
TCI Chemical C2587 Cilostazol >98.0%(HPLC) 73963-72-1 1g $88 2018-11-22 Buy
TCI Chemical C2587 Cilostazol >98.0%(HPLC) 73963-72-1 5g $304 2018-11-22 Buy
Alfa Aesar J62301 Cilostazol, 98% 73963-72-1 50mg $370 2018-11-13 Buy

Cilostazol Chemical Properties,Uses,Production

Pharmacological effects

Cilostazol is commonly used clinically anti-platelet and anti-clotting drugs. It belongs to a phosphodiesterase inhibitor and can inhibit the activity of phosphodiesterase of platelet and smooth muscle cells, leading to increase of the cAMP concentration in platelets and vascular smooth muscle. It can significantly inhibit the platelet aggregation induced by various kinds of aggregation inducers, and can cause the dissociation of the aggregates. Its major metabolite, epoxide has a three to four fold activity of the prototype drug. It has significant antithrombotic effect on the brain circulation and peripheral circulatory disturbance caused by collagen, ADP, arachidonic acid and sodium laurate. Artery injection of this product can increase the blood flow rate with the strongest effect on the peripheral blood vessels but the weakest effect on the cerebral blood vessels.
This product is rapidly absorbed in the intestine after oral administration with the Tmax being 3h, PPB being about 95%. Consecutive administration of four days by twice per day caused no increase in the plasma concentration accumulation. It has good tissue distribution with especially high level in the stomach, liver and kidney. At 72h after administration, 42.75% of the administered drug is excreted via urine and 61.7% is subject to fecal excretion. After 48 hour of administration, bile excretion rate is 31.7%. T1/2α is 2.2h and T1/2β is 18h.

Clinical application

It can be used to alleviate the ischemic symptom such as ulcers, limb pain, cold sensation and intermittent claudication caused by chronic arterial occlusive disease. It can also be applied to the adjuvant treatment of atherosclerosis, arteritis, thromboangiitis obliterans, diabetes-induced ischemia of extremity and takayasu arteritis. Cilostazol also be used as a complementary therapy after surgical treatment to help alleviate the symptoms, improve the circulation and inhibiting thrombosis in transplanted blood vessel.

Side effects

There may be occasionally rash, hives, itching, palpitations, pulse frequency, low blood pressure, fever, dizziness, dizziness, vertigo, insomnia or drowsiness, swelling, pain, fatigue, weakness, stomach discomfort, nausea, vomiting, loss of appetite, diarrhea, upper abdominal pain, abdominal fullness, increased level of GOT (serum alanine aminotransferase), ALP (serum alkaline phosphatase), LDH (serum lactate dehydrogenase), BUN (blood urea nitrogen), creatinine and uric acid, gastrointestinal bleeding, epistaxis, subcutaneous bleeding, retinal hemorrhage, hematuria, bleeding tendencies and thrombocytopenia.
The above information is edited by the chemicalbook of Dai Xiongfeng.


Patients of hemophilia, capillary fragility syndrome, upper gastrointestinal bleeding and urinary tract bleeding as well as vitreous hemorrhage should be disabled. Women of pregnancy or possible pregnancy should be disabled.
This product is should be taken cautious when being applied to patients in the use of anticoagulants (warfarin) or antiplatelet drugs (aspirin, Ticlid) patients. When using cilostazol, the patients should be subject to blood coagulation performance test.
Women in menstrual period, patients of bleeding tendency or with severe hepatic and renal dysfunction as well as elderly should administer with caution; breast-feeding women should avoid breast-feeding.

Chemical Properties

It is colorless, needle-like crystals obtained from methanol with the m.p. being 159.4~160.3 ℃ and the UV absorption maximum (methanol) being 257nm (ε15200). It is easily soluble in acetic acid, chloroform, N-methyl-2-pyrrolidone or dimethyl sulfoxide and almost insoluble in ether, water, 0.1mol/L hydrochloric acid or 0.1mol/L sodium hydroxide.


It can significantly inhibit the platelet aggregation caused by various inducers and aggregates and can dissociate the aggregates without causing secondary aggregation. It has significant antithrombotic effect on the brain circulation and peripheral circulatory disturbance caused by collagen, ADP, arachidonic acid and sodium laurate. It can also be used for treating ischemic diseases such as chronic arterial occlusive ulcer, pain and coldness.

Production method

Take 5-chloro-N-cyclohexyl pentanamide as the raw material. Under ice-cooling, to 15 mL of benzene solution containing 1.75g ​​5-chloro-N-cyclohexyl-pentyl amide solution, slowly add 1.9 g of phosphorus pentachloride and stir at room temperature for 1h. At room temperature and stirring, add 1.4mol/L HN3 to 1 mL of the benzene solution. After stirring overnight, continue the reflux for 2h. The solvent was distilled off under reduced pressure with the residue being poured into ice water and subject to chloroform extraction. The extract was successively washed with water, dilute sodium bicarbonate solution and water, further dried by anhydrous sodium sulfate. After the chloroform was distilled off, the residue was subject to isopropanol-water recrystallization to obtain 1.7 g of 5-(4-chlorobutyl)-l-cyclohexyl-tetrazole, being as colorless needle-like crystals with the yield being 87% and the m.p. being 48-49 ℃.
Dissolve 3.2 g 6-hydroxy-3, 4-dihydrogen-2(1H)-quinolinone and 1.4 g of potassium hydroxide in 20 mL of isopropanol. Under reflux, add drop wise of the isopropanol solution containing 5.7 g of the tetrazole obtained above. Continue stirring and reflux for 4h. Evaporate to dryness with the residue being extracted with chloroform. The extract was washed with l mol/L sodium hydroxide solution, dilute hydrochloric acid and water, dried by anhydrous sodium sulfate. Chloroform was distilled off with the residual liquid being subject to chromatograph on silica gel. Use chloroform-methanol (30: 1) for elution. Then apply methanol-water recrystallization to obtain 6.0 g of colorless needles cilostazol with the yield being 74% and the melting point being 158 ​​~ 159 ℃.


Cilostazol is a platelet aggregation inhibitor with cerebral vasodilating activity, indicated for use in stroke and myocardial infarction. In patients with cerebral thrombosis, transient ischemia and cerebral arteriosclerosis, cilostazol significantly inhibits ADP-, collagenand epinephrine-induced platelet aggregation. Side effects include headache and tachycardia.

Chemical Properties

Colourless Needles


Otsuka (Japan)


A potent phosphodiesterase III A (PDE3A) inhibitor (IC50=0.2uM) and inhibitor of adenosine uptake. Has antimitogeni, antithrombotic, vasodilatory and cardiotonic properties in vivo. Also affects lipid levels in vivo


antibacterial; LD50(iv) 280mg/kg(mouse)


ChEBI: A lactam that is 3,4-dihydroquinolin-2(1H)-one in which the hydrogen at position 6 is substiuted by a 4-(1-cyclohexyl-1H-tetrazol-5-yl)butoxy group.

brand name

Pletal (Otsuka);Reta.

Biological Activity

Potent phosphodiesterase III A (PDE3A) inhibitor (IC 50 = 0.2 μ M) and inhibitor of adenosine uptake. Has antimitogenic, antithrombotic, vasodilatory and cardiotonic properties in vivo . Also affects lipid levels in vivo .

Cilostazol Preparation Products And Raw materials

Raw materials

Preparation Products

Cilostazol Suppliers

Global( 283)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Capot Chemical Co.,Ltd.
+86 (0)571-855 867 18
+86 (0)571-858 647 95 China 19918 60
Shenzhen Sendi Biotechnology Co.Ltd.
0755-23311925 18102838259
0755-23311925 CHINA 3203 55
Henan DaKen Chemical CO.,LTD.
+86-371-55531817 CHINA 21935 58
Beijing Cooperate Pharmaceutical Co.,Ltd.
+86-10-60279497 +86(0)15646567669
+86-10-60279497 CHINA 1529 55
Henan Tianfu Chemical Co.,Ltd.
0371-55170693 CHINA 20676 55
Mainchem Co., Ltd.
+86-0592-6210733 CHINA 32452 55
Xiamen AmoyChem Co., Ltd
+86 (0)592-605 1114 CHINA 6374 58
career henan chemical co
+86-371-86658258 CHINA 25796 58
Chemwill Asia Co.,Ltd.
86-21-51861608;;; CHINA 23958 58
Hubei Jusheng Technology Co.,Ltd.
86-188-71490254 CHINA 20084 58

View Lastest Price from Cilostazol manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2018-12-21 Cilostazol
US $7.00 / kg 1kg 99% 100kg career henan chemical co

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