Zoladex Mechanism of Action Zoladex is a gonadotropin‑releasing hormone (GnRH) agonist. Binds to GnRH receptors in the anterior pituitary → sequential overstimulation of gonadotropin release (LH/FSH). The initial surge causes a transient rise in sex steroid production (estrogen/testosterone). Persistent stimulation leads to down‑regulation of pituitary GnRH receptors, resulting in suppressed LH and FSH secretion. Consequence: … Read more
Zofran ODT Zofran ODT (ondansetron oral disintegrating tablets) is a 5‑hydroxytryptamine‑3 (5‑HT3) receptor antagonist used primarily for the prevention and treatment of nausea and vomiting associated with chemotherapy, radiation, and surgery. The ODT formulation allows rapid onset of action when patients cannot swallow. Mechanism of Action Competitive antagonist at peripheral and central 5‑HT3 receptors Peripheral: … Read more
Zofran Mechanism of Action Zofran (ondansetron) is a highly selective blocker of 5‑hydroxytryptamine type 3 (5‑HT3) receptors. It antagonizes serotonin released from enterochromaffin cells in the GI tract and from presynaptic vagal afferents in the chemoreceptor trigger zone. By inhibiting postsynaptic 5‑HT3 receptors on vagal afferent neurons, it prevents the transmission of nausea and vomiting signals … Read more
Zocor Zocor (generic: simvastatin) is a first‑generation statin that competitively inhibits HMG‑CoA reductase, leading to potent LDL‑lowering and cardiovascular risk reduction. Mechanism of Action Competitive inhibition of hepatic HMG‑CoA reductase, the rate‑limiting enzyme in cholesterol biosynthesis. ↓ intracellular cholesterol → ↑ LDL‑receptor expression on hepatocytes → enhanced clearance of plasma LDL‑cholesterol. Modest reductions in VLDL, triglycerides, … Read more
Zithromax Zithromax (generic azithromycin) is a 15‑membered macrolide antibiotic commonly used for a variety of Gram‑positive, Gram‑negative, and atypical bacterial infections. It is particularly valued for its long half‑life, excellent tissue penetration, and once‑daily dosing convenience. Mechanism of Action Azithromycin binds reversibly to the 50S ribosomal subunit of susceptible bacteria, inhibiting the translocation step (i.e. … Read more
Ziprasidone Ziprasidone (brand name Geodon) is a second‑generation (atypical) antipsychotic widely used for schizophrenia and bipolar disorder. It offers a distinct receptor profile that translates into a favorable metabolic side‑effect profile but requires careful cardiac monitoring. Mechanism of Action Dopamine D₂ receptor antagonist (IC₅₀ ≈ 35 nM) – blocks mesolimbic and nigrostriatal pathways, reducing positive psychotic … Read more
Zinc sulfate Mechanism of Action Zinc sulfate is a phytometabolite that restores systemic zinc levels. Its principal pharmacologic action involves: Enzyme cofactor: Serves as a catalytic cofactor for >300 enzymes, notably DNA polymerase, RNA polymerase, and alkaline phosphatase, thereby supporting cellular proliferation and nucleic acid synthesis. Antioxidant and anti‑inflammatory: Scavenges reactive oxygen species and inhibits … Read more
Zinc Oxide Topical Zinc oxide is a white, opaque powder used as a topical agent in dermatology and over‑the‑counter sun protection products. It is formulated as a cream, ointment, lotion, or diaper cream and is commonly applied to intact or broken skin for barrier protection, irritation control, and UV filtering. Mechanism of Action Physical UV … Read more
Zinc Oxide Mechanism of Action Zinc oxide is a physical (mineral) barrier that reflects and scatters ultraviolet (UV) radiation, reducing skin exposure to UVA and UVB rays. As a topical inhibitor of keratinocyte proliferation, it exhibits mild anti‑inflammatory activity by suppressing prostaglandin synthesis and down‑regulating pro‑inflammatory cytokines. In topical preparations, it also stabilizes the skin … Read more
Zinc gluconate Mechanism of Action Zinc gluconate is a salt of the essential trace mineral zinc, delivered as a highly soluble complex that is readily absorbed in the small intestine. Inhibition of viral replication: By competing with the zinc finger domains of viral polymerases, it blocks RNA transcription and reduces viral load; clinically useful in … Read more