Introduction Losartan is an angiotensin II receptor blocker (ARB) widely used in the management of hypertension, heart failure, and diabetic nephropathy. Unlike ACE inhibitors, losartan directly blocks the effects of angiotensin II at its receptor rather than inhibiting its formation. This results in vasodilation, reduced aldosterone secretion, and decreased blood pressure without significantly affecting bradykinin … Read more
Introduction Loratadine is a second-generation antihistamine widely used in the treatment of allergic conditions such as allergic rhinitis and urticaria. It selectively antagonizes peripheral histamine H1 receptors, thereby reducing allergic symptoms without causing significant sedation. Compared to first-generation antihistamines, loratadine has minimal penetration into the central nervous system, making it a preferred choice for daytime … Read more
Introduction Loop diuretics are potent diuretics primarily used in conditions requiring rapid and effective removal of excess fluid, such as heart failure, pulmonary edema, and edema associated with renal or hepatic disease. The most commonly used loop diuretic is furosemide. These drugs act on the thick ascending limb of the loop of Henle and are … Read more
Introduction Local anesthetics are drugs that reversibly block nerve conduction, producing loss of sensation in a specific area without affecting consciousness. They are widely used in minor surgical procedures, dental practice, regional anesthesia, and pain management. The fundamental mechanism involves inhibition of voltage-gated sodium channels in nerve fibers, preventing the initiation and propagation of action … Read more
Introduction Lisinopril is a long-acting angiotensin-converting enzyme (ACE) inhibitor used mainly in hypertension, heart failure, and selected patients after acute myocardial infarction. It acts primarily by suppressing the renin-angiotensin-aldosterone system (RAAS), thereby reducing vasoconstriction, aldosterone release, and maladaptive cardiovascular remodeling. Because ACE is also involved in bradykinin breakdown, lisinopril may increase bradykinin levels, which contributes … Read more
Introduction Lidocaine is a widely used local anesthetic and class IB antiarrhythmic drug. It is commonly used for local and regional anesthesia as well as in the management of ventricular arrhythmias. Lidocaine works by blocking nerve conduction and stabilizing cardiac membranes. Mechanism of Action (Step-wise) Pharmacokinetics Clinical Uses Adverse Effects Comparative Analysis Feature Lidocaine Bupivacaine … Read more
Introduction Levothyroxine is a synthetic form of thyroxine (T4), a thyroid hormone used in the treatment of hypothyroidism and related thyroid disorders. It serves as a hormone replacement therapy, restoring normal metabolic activity in patients with deficient thyroid function. Levothyroxine is converted in peripheral tissues to the more active form, triiodothyronine (T3). Mechanism of Action … Read more
Introduction Levosimendan is a calcium sensitizer and inodilator used in the management of acute decompensated heart failure. It improves cardiac contractility without significantly increasing myocardial oxygen demand and produces vasodilation, making it beneficial in patients with reduced cardiac output. Mechanism of Action (Step-wise) Pharmacokinetics Clinical Uses Adverse Effects Comparative Analysis Feature Levosimendan Dobutamine Milrinone Class … Read more
Introduction Leflunomide is an immunomodulatory and disease-modifying antirheumatic drug (DMARD) used primarily in the treatment of rheumatoid arthritis and psoriatic arthritis. It suppresses immune cell proliferation and reduces inflammation, thereby slowing disease progression and joint damage. Mechanism of Action (Step-wise) Pharmacokinetics Clinical Uses Adverse Effects Comparative Analysis Feature Leflunomide Methotrexate Sulfasalazine Class DMARD DMARD DMARD … Read more
Introduction Latanoprost is a prostaglandin F2α (PGF2α) analog used as a first-line agent in the management of open-angle glaucoma and ocular hypertension. It effectively lowers intraocular pressure (IOP) by increasing aqueous humor outflow, thereby preventing optic nerve damage and vision loss. Mechanism of Action (Step-wise) Pharmacokinetics Clinical Uses Adverse Effects Comparative Analysis Feature Latanoprost Timolol … Read more
