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Pharmacy Freak

Pharmacy Freak Editorial Team

Harsh Singh Rajput is a pharmacist currently working at ESIC and holds an MBA in Pharmaceutical Management from NIPER Hyderabad. He has a strong academic record with top ranks in national-level pharmacy exams, including AIR 61 in NIPER 2024 (MS/M.Pharm), AIR 27 in NIPER MBA, AIR 147 in GPAT 2024, AIR 907 in GPAT 2023, and AIR 6 in AIIMS CRE-2025 for Drug Store Keeper. At PharmacyFreak.com, he contributes expert content, exam strategies, and practical guidance for future pharmacists. Mail- harsh@pharmacyfreak.com

Mechanism of Action of Loratadine

Loratadine pharmacology

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

Mechanism of Action of Loperamide

Mechanism of action of Loperamide

Introduction Loperamide is a peripherally acting opioid agonist widely used as an antidiarrheal agent. It effectively reduces intestinal motility and secretion without producing significant central nervous system effects at therapeutic doses. Unlike other opioids, loperamide has minimal abuse potential because it does not readily cross the blood-brain barrier due to active efflux mechanisms. It is … Read more

Mechanism of Action of Loop Diuretics

Mechanism of action of Loop Diuretics

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

Mechanism of Action of Local Anesthetics

Flowchart of mechanism of action of Local Anesthetics

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

Mechanism of Action of Lithium

MOA of Lithium

Introduction Lithium is the prototypical mood stabilizer and remains one of the most important drugs for bipolar disorder, especially for acute mania and maintenance therapy. Its exact therapeutic mechanism is not fully defined in humans, and the official prescribing information states that the mechanism of action of lithium as a mood-stabilizing agent is unknown. However, … Read more

Mechanism of Action of Lisinopril

MOA of Lisinopril

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

Mechanism of Action of Lidocaine

Mechanism of Action of Lidocaine

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

Mechanism of Action of Levothyroxine

MOA of Levothyroxine

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

Mechanism of Action of Levosimendan

Mechanism of action of Levosimendan

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

Mechanism of Action of Leflunomide

Mechanism of Action of Leflunomide

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

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