Harsh Singh Rajput 
Introduction Vincristine is a vinca alkaloid antineoplastic agent widely used in the treatment of hematological malignancies and certain solid tumors. It is derived from the Madagascar periwinkle plant, Catharanthus roseus, and acts by disrupting microtubule formation during cell division. Vincristine is a cell cycle-specific chemotherapeutic drug that primarily acts during the M phase (mitosis). Because … Read more
Introduction Verapamil is a non-dihydropyridine calcium channel blocker (CCB) that is widely used in the treatment of hypertension, angina pectoris, and supraventricular arrhythmias. Unlike dihydropyridine calcium channel blockers that primarily act on vascular smooth muscle, verapamil exerts significant effects on both cardiac muscle and the cardiac conduction system. By inhibiting L-type calcium channels in the … Read more
Introduction Venlafaxine is a serotonin-norepinephrine reuptake inhibitor (SNRI) antidepressant widely used in the treatment of major depressive disorder, generalized anxiety disorder, social anxiety disorder, and panic disorder. Unlike selective serotonin reuptake inhibitors (SSRIs), venlafaxine enhances both serotonergic and noradrenergic neurotransmission, providing broader modulation of mood-regulating pathways. Venlafaxine is often considered a dual-action antidepressant because its … Read more
Introduction Vasodilators are a diverse group of drugs that produce relaxation of vascular smooth muscle, resulting in widening of blood vessels and improved blood flow. They are commonly used in the management of hypertension, heart failure, angina pectoris, hypertensive emergencies, pulmonary hypertension, and various cardiovascular disorders. The therapeutic effects of vasodilators arise from their ability … Read more
Introduction Valproate (valproic acid, sodium valproate, and divalproex sodium) is a broad-spectrum antiepileptic drug used in epilepsy, bipolar disorder, and migraine prophylaxis. It is effective against multiple seizure types because it acts through several mechanisms, including enhancement of GABAergic neurotransmission, blockade of voltage-gated sodium channels, and inhibition of T-type calcium channels. Mechanism of Action (Step-wise) … Read more
Introduction Trazodone is an atypical antidepressant classified as a serotonin antagonist and reuptake inhibitor (SARI). It is commonly used for major depressive disorder, anxiety disorders, and insomnia. Unlike SSRIs, trazodone combines serotonin reuptake inhibition with serotonin receptor antagonism, producing antidepressant, anxiolytic, and sedative effects. Mechanism of Action (Step-wise) A key exam point is that trazodone … Read more
Introduction Tranexamic acid is an antifibrinolytic (hemostatic) agent used to prevent and control bleeding. It is a synthetic lysine analog that inhibits fibrinolysis by preventing the breakdown of fibrin clots. Tranexamic acid is widely used in trauma, surgery, postpartum hemorrhage, heavy menstrual bleeding, epistaxis, and various bleeding disorders. Mechanism of Action (Step-wise) A key exam … Read more
Introduction Tramadol is a centrally acting analgesic used for the management of moderate to moderately severe pain. It has a unique dual mechanism of action, functioning as both a weak μ-opioid receptor agonist and an inhibitor of norepinephrine and serotonin reuptake. This combination provides effective pain relief while producing less respiratory depression than many traditional … Read more
Introduction Tolterodine is an antimuscarinic agent used primarily for the treatment of overactive bladder (OAB) with symptoms such as urinary urgency, urinary frequency, and urge urinary incontinence. It reduces involuntary bladder contractions by blocking muscarinic receptors in the urinary bladder, thereby increasing bladder storage capacity and improving urinary control. Mechanism of Action (Step-wise) A key … Read more
Introduction Tizanidine is a centrally acting skeletal muscle relaxant used primarily for the management of spasticity associated with conditions such as multiple sclerosis, spinal cord injury, stroke, and other neurological disorders. It reduces excessive muscle tone by inhibiting excitatory neurotransmission within the central nervous system. Unlike neuromuscular blocking agents, tizanidine acts at the spinal cord … Read more
