USMLE - Pharmacy Freak

Mechanism of Action of β-Lactamase Inhibitors

April 10, 2026March 23, 2026 Pharmacy Freak Editorial Team Harsh Singh Rajput

Introduction β-Lactamase inhibitors are a class of drugs used in combination with β-lactam antibiotics to overcome bacterial resistance. Many bacteria produce β-lactamase enzymes that hydrolyze the β-lactam ring, rendering antibiotics like penicillins and cephalosporins ineffective. β-Lactamase inhibitors protect these antibiotics by inhibiting the enzyme, thereby restoring their antibacterial activity. Mechanism of Action (Step-wise) Pharmacokinetics Clinical … Read more

Mechanism of Action of Labetalol

April 10, 2026March 23, 2026 Pharmacy Freak Editorial Team Harsh Singh Rajput

Introduction Labetalol is a mixed adrenergic receptor antagonist with both α1- and β-adrenergic blocking properties. It is widely used in the management of hypertension, including hypertensive emergencies and pregnancy-induced hypertension. Its unique dual action allows it to reduce blood pressure without significant reflex tachycardia. Mechanism of Action (Step-wise) Pharmacokinetics Clinical Uses Adverse Effects Comparative Analysis … Read more

Mechanism of Action of Ketorolac

April 10, 2026March 23, 2026 Pharmacy Freak Editorial Team Harsh Singh Rajput

Introduction Ketorolac is a potent nonsteroidal anti-inflammatory drug (NSAID) primarily used for short-term management of moderate to severe pain, especially postoperative pain. It is often considered an alternative to opioids due to its strong analgesic effect without causing respiratory depression. Ketorolac belongs to the acetic acid class of NSAIDs and is known for its significant … Read more

Mechanism of Action of Levetiracetam (Keppra)

April 10, 2026March 22, 2026 Pharmacy Freak Editorial Team Harsh Singh Rajput

Introduction Levetiracetam (brand name: Keppra) is a broad-spectrum antiepileptic drug used in the management of partial seizures, myoclonic seizures, and generalized tonic-clonic seizures. It is known for its unique mechanism of action, favorable safety profile, and minimal drug interactions, making it widely used in both adults and pediatric patients. Mechanism of Action (Step-wise) Pharmacokinetics Clinical … Read more

Mechanism of Action of Ivabradine

April 10, 2026March 22, 2026 Pharmacy Freak Editorial Team Harsh Singh Rajput

Introduction Ivabradine is a selective heart rate–reducing agent primarily used in the management of chronic stable angina and heart failure with reduced ejection fraction (HFrEF). Unlike beta-blockers, it reduces heart rate without affecting myocardial contractility or blood pressure significantly. Its action is highly specific to the sinoatrial (SA) node. Mechanism of Action (Step-wise) Pharmacokinetics Clinical … Read more

Mechanism of Action of Isotretinoin

April 10, 2026March 21, 2026 Pharmacy Freak Editorial Team Harsh Singh Rajput

Introduction Isotretinoin is an oral retinoid (13-cis-retinoic acid) primarily used in the treatment of severe nodulocystic acne and acne resistant to conventional therapy. It is one of the most effective anti-acne agents because it targets multiple pathogenic factors involved in acne development, including sebum production, follicular keratinization, bacterial proliferation, and inflammation. Mechanism of Action (Step-wise) … Read more

Mechanism of Action of Isoprenaline

April 10, 2026March 21, 2026 Pharmacy Freak Editorial Team Harsh Singh Rajput

Introduction Isoprenaline (isoproterenol) is a non-selective β-adrenergic agonist that stimulates both β1 and β2 receptors. It is used in conditions such as bradycardia, heart block, and occasionally in asthma. Due to its potent cardiac and bronchodilatory effects, it plays an important role in emergency and specific clinical settings. Mechanism of Action (Step-wise) Pharmacokinetics Clinical Uses … Read more

Mechanism of Action of Irinotecan

April 10, 2026March 20, 2026 Pharmacy Freak Editorial Team Harsh Singh Rajput

Introduction Irinotecan is a semi-synthetic camptothecin derivative used as an antineoplastic agent, primarily in the treatment of colorectal cancer and other solid tumors. It is a prodrug that requires metabolic activation to exert its cytotoxic effects. Irinotecan interferes with DNA replication in rapidly dividing cancer cells, leading to cell death. Mechanism of Action (Step-wise) Pharmacokinetics … Read more

Mechanism of Action of Ipratropium Bromide

April 10, 2026March 20, 2026 Pharmacy Freak Editorial Team Harsh Singh Rajput

Introduction Ipratropium bromide is a short-acting anticholinergic (antimuscarinic) bronchodilator primarily used in the management of chronic obstructive pulmonary disease (COPD) and, in some cases, asthma. It is a quaternary ammonium compound derived from atropine, designed for inhalational use with minimal systemic absorption. Its main action is to reduce bronchoconstriction mediated by the parasympathetic nervous system. … Read more

Mechanism of Action of Indapamide

April 10, 2026March 19, 2026 Pharmacy Freak Editorial Team Harsh Singh Rajput

Introduction Indapamide is a thiazide-like diuretic commonly used in the management of hypertension and edema. Although structurally different from classic thiazides, it shares similar pharmacological properties. Indapamide is particularly valued for its dual action, combining diuretic effects with direct vasodilatory activity, making it effective in long-term blood pressure control. Mechanism of Action (Step-wise) Pharmacokinetics Clinical … Read more