Wellbutrin SR Wellbutrin SR (bupropion hydrochloride sustained‑release) is a β‑adrenergic agonist antidepressant most frequently prescribed for major depressive disorder (MDD) and seasonal affective disorder (SAD). It can also serve as an adjunctive agent for smoking cessation (marketed under Zyban). Mechanism of Action Partial inhibitor of dopamine (DAT) and norepinephrine (NET) reuptake, increasing synaptic concentrations of … Read more
Wellbutrin Mechanism of Action Bupropion, the active ingredient in Wellbutrin, is a norepinephrine‑dopamine reuptake inhibitor (NDRI). Inhibits the dopamine and norepinephrine transporters (DAT & NET), increasing synaptic dopamine and norepinephrine. Minimal serotonin activity reduces risk of serotonin syndrome. Partial agonist at nicotinic acetylcholine receptors → explains its efficacy in smoking cessation (Janssen product Zyban). Pharmacokinetics … Read more
Welireg Bacterial extract‑based sublingual immunotherapy for birch pollen–induced seasonal allergic rhinitis — Mechanism of Action Welireg delivers a graded dose of birch pollen allergen directly across the sublingual mucosa, initiating a controlled immune response that leads to long‑term tolerance: Allergen‑specific IgG4 induction – competes with IgE for allergen binding, preventing mast cell degranulation. Regulatory T‑cell … Read more
Welchol Welchol (colesevelam HCl) is a bile acid sequestrant used primarily for the management of type 2 diabetes mellitus and dyslipidemia (hypercholesterolemia). It is marketed as a once‑daily oral tablet that modulates glucose and lipid metabolism by binding bile acids in the gut. Mechanism of Action Bile acid sequestration: Colesevelam is a non‑absorbable polymer that binds … Read more
Wegovy Wegovy® (semaglutide) is a once‑weekly, long‑acting glucagon‑like peptide‑1 receptor agonist (GLP‑1 RA) indicated for chronic weight management in adults with obesity or overweight plus at least one weight‑related comorbidity. — Mechanism of Action GLP‑1 receptor activation: Mimics endogenous GLP‑1 → stimulates pancreatic β‑cell insulin secretion (glucose‑dependent) and inhibits glucagon release. Central suppression of appetite: … Read more
Wayrilz Wayrilz is a novel oral selective serotonin–norepinephrine–dopamine reuptake inhibitor (SNDRI) developed for the treatment of major depressive disorder (MDD) and generalized anxiety disorder (GAD). It combines rapid onset with an attenuated risk of serotonergic adverse events. Mechanism of Action Tri‑selective reuptake inhibition: Serotonin transporter (SERT) inhibition → increases extracellular 5‑HT. Norepinephrine transporter (NET) inhibition … Read more
Water for Injection Water for Injection (WFI) is a sterile, pyrogen‑free, inorganic salt‑free water used exclusively as a solvent for pharmaceutical preparations and for the dilution or reconstitution of injectable drugs. It is not an active pharmaceutical ingredient and has no therapeutic action by itself. Mechanism of Action Physical solvent: WFI provides a medium for … Read more
Wart Remover “Wart Remover” (generic topical salicylic acid formulation, 17‑20 %) is the most widely used over‑the‑counter (OTC) agent for treating benign verruca lesions. Mechanism of Action Keratolytic activity: Salicylic acid dissolves the hyperplastic cornified layer of wart tissue by disrupting desmosomal attachments and promoting cellular desquamation. Antiviral effect: At the cellular level it interferes with … Read more
Warfarin Warfarin is a vitamin K antagonist widely used as an oral anticoagulant for prevention and treatment of venous thromboembolism, atrial fibrillation, and mechanical heart‑valve thrombosis. Mechanism of Action Inhibits the vitamin K epoxide reductase complex‑1 (VKORC1), preventing regeneration of reduced vitamin K. Suppresses γ‑carboxylation of coagulation factors II, VII, IX, X, and proteins C & S, thereby … Read more
Wakix Mechanism of Action Wakix (solriamfetol) is a selective dopamine reuptake inhibitor that also targets the norepinephrine transporter (NET). Inhibits the dopamine transporter (DAT) → ↑ extracellular dopamine in the CNS, enhancing wakefulness and alertness. Partial blockade of NET contributes to norepinephrine‑mediated arousal pathways. No affinity for serotonin or adenosine receptors, limiting serotonergic side‑effects common … Read more