Ticlopidine is an oral platelet aggregation inhibitor belonging to the thienopyridine class. It acts by irreversibly inhibiting the P2Y12 ADP receptor on platelet cell membranes, preventing ADP-mediated activation of the GPIIb/IIIa complex, and thus reducing the risk of thrombus formation. Ticlopidine is used to prevent stroke, myocardial infarction, and stent thrombosis, particularly in patients who are intolerant or unresponsive to aspirin.
Due to its side effect profile, it has largely been replaced by safer alternatives like clopidogrel but remains in use in certain cases.
Therapeutic indications include:
• Secondary prevention of ischemic stroke
• Prevention of thrombotic complications after coronary stenting
• Peripheral artery disease-related thrombotic risk
• Aspirin intolerance or resistance
Parent: Ticlopidine
Parent: Ticlopidine
Parent: Ticlopidine
Parent: Ticlopidine
Parent: Ticlopidine
Parent: Ticlopidine
Parent: Ticlopidine
Parent: Ticlopidine
Parent: Ticlopidine
Parent: Ticlopidine
Parent: Ticlopidine/ Ticlopidine Hydrochloride
Impurities in ticlopidine arise primarily from its multi-step synthesis, involving thienopyridine ring formation, acylation, and substitution reactions. Because it is a sulfur- and nitrogen-containing heterocycle, impurity control is essential to ensure stability, efficacy, and safety. Guidelines such as ICH Q3A/B and pharmacopoeial standards (e.g., USP, EP) apply.
Process-Related Impurities
• Unreacted starting materials such as 2-chlorobenzyl chloride or thiophene derivatives
• Intermediates from incomplete cyclization or acylation steps
• Residual solvents like dichloromethane, acetone, or methanol
• By-products formed through over-chlorination or substitution reactions
Degradation Impurities
• Oxidation of the thienopyridine ring, forming sulfoxide or sulfone derivatives
• Hydrolysis of functional groups under extreme pH conditions
• Photodegradation under direct light exposure
• Rearranged or isomerized impurities due to prolonged storage or elevated temperature
Elemental Impurities
• Trace metals such as iron, tin, or copper from processing equipment
• Controlled under ICH Q3D for oral drug substances
Analytical Techniques for Impurity Detection
Ticlopidine is used to prevent strokes, heart attacks, and clotting events in patients with cardiovascular risk, especially in aspirin-intolerant individuals.
It irreversibly inhibits the P2Y12 receptor on platelets, blocking ADP-induced aggregation and reducing thrombus formation.
Its use has declined due to serious hematologic adverse effects and the availability of safer alternatives like clopidogrel.
Store at room temperature (15–30°C), in a dry, well-closed container away from light and moisture.
