Zosyn Zosyn is a brand name for the combination antibiotic piperacillin/tazobactam, used widely for severe bacterial infections. Mechanism of Action Piperacillin: A β‑lactam that interferes with bacterial cell‑wall synthesis by binding to penicillin‑binding proteins (PBPs), disrupting peptidoglycan cross‑linking. Tazobactam: A β‑lactamase inhibitor that protects piperacillin from enzymatic degradation by many β‑lactamases (including class A, C, … Read more
Zoryve Zoryve (mirabegron inhalation) is a once‑daily β3‑adrenergic receptor agonist delivered by a breath‑actuated inhaler for the treatment of chronic obstructive pulmonary disease (COPD). Mechanism of Action Lung‑specific β3‑adrenergic receptor stimulation → ↑ intracellular cyclic‑AMP → smooth‑muscle relaxation → bronchodilation. Provides an alternative bronchodilator pathway distinct from β2‑agonists, with potential benefit in patients poorly responsive … Read more
Zopiclone — Mechanism of Action Benzodiazepine‑receptor agonist that binds to the γ‑aminobutyric acid A (GABAA) receptor complex. Acts as a positive allosteric modulator: Enhances chloride influx, hyperpolarizing neuronal membranes. Increases the frequency of channel opening when GABA is present. Lacks significant affinity for benzodiazepine‑related receptors (e.g., 5‑HT2, α2 adrenergic), giving it a distinct profile of … Read more
Zonisamide Zonisamide is a second‑generation antiepileptic drug (AED) primarily used as adjunctive therapy for partial‑onset seizures. Its dual mechanism enhances sodium‑channel inactivation and potentiates GABAergic inhibition while also alkalinizing urine—features that contribute to its unique pharmacological profile. Mechanism of Action Voltage‑gated sodium channel blockade: Prolongs inactivation of neuronal membranes, reducing burst firing in epileptic foci. … Read more
Zomig (telcagepant) Mechanism of Action Zomig is a selective calcitonin gene‑related peptide (CGRP) receptor antagonist. It competitively blocks the CGRP receptor on vascular smooth‑muscle and sensory nerve cells, preventing CGRP‑mediated vasodilation and neurogenic inflammation that drive migraine pain. Unlike triptans, it does not cause vasoconstriction of intracranial arteries, making it safe in patients with cardiovascular … Read more
Zometa Mechanism of Action Zoledronic acid is a bisphosphonate that selectively binds to hydroxyapatite in bone, concentrating its effect at sites of active osteoclastic resorption. Once internalized by osteoclasts, it reacts with farnesyl pyrophosphate synthase (FPPS) in the mevalonate pathway, generating a non-hydrolyzable ATP analogue that irreversibly inhibits protein prenylation. Inhibition of prenylation disrupts osteoclast … Read more
Zolpidem Zolpidem is a non‑benzodiazepine hypnotic agent belonging to the imidazopyridine class. It is predominantly used for the short‑term treatment of insomnia, acting via selective modulation of the GABA(_A) receptor complex. Mechanism of Action Selective agonism at GABA(_A) receptors: Binds the ω‑1 benzodiazepine site (α(_1) subunit‑containing GABA(_A) receptors). Enhances chloride flux, hyperpolarizing neuronal membranes, leading … Read more
Zoloft Sertraline fumarate – Selective Serotonin Reuptake Inhibitor (SSRI) Mechanism of Action Selective inhibition of serotonin (5‑HT) reuptake by blocking the serotonin transporter (SERT) in presynaptic neurons. ↑ Synaptic 5‑HT concentration → enhanced stimulation of postsynaptic serotonin receptors. Minimal activity at other monoamine transporters (dopamine, norepinephrine) and minimal anticholinergic, alpha‑adrenergic, or histaminergic effects. Steady‑state plasma … Read more
Zolmitriptan Mechanism of Action Selective agonist at 5‑HT₁B/1D receptors located on cranial blood vessels and trigeminal pain pathways. Triggers vasoconstriction of dilated cranial arteries → ↓ neurogenic inflammation. Inhibits neuropeptide release (CGRP, substance P) from trigeminal afferents → ↓ pain signaling. Induces centrally mediated anti‑nausea via limbic system modulation. Pharmacokinetics Parameter Typical Value Formulation Oral … Read more
Zoledronic acid Zoledronic acid (brand names: Zometa®, Histonav®) is a potent nitrogen‑containing bisphosphonate used intravenously to treat bone‑related disorders. — Mechanism of Action Inhibition of osteoclast activity Binds strongly to hydroxyapatite in bone, preferentially taken up by osteoclasts during resorption. Inhibits farnesyl diphosphate synthase in the mevalonate pathway → prevents protein prenylation required for osteoclast … Read more