Drug Journeys
Trace a drug molecule's adventure through the human body — absorption, distribution, mechanism, metabolism, and excretion.
The Journey of Adalimumab
Antibody Meets Cytokine
Adalimumab, the first fully human anti-TNF monoclonal antibody, travels from subcutaneous injection via lymphatic drainage into the circulation, binds soluble …
The Journey of Allopurinol
Shutting Down Uric Acid Production
Allopurinol is absorbed orally and rapidly converted to its longer-acting active metabolite oxypurinol, which covalently inhibits xanthine oxidase — the …
The Journey of Amlodipine
The Longest-Acting Calcium Blocker
Amlodipine's unusually slow binding to and dissociation from L-type calcium channels in vascular smooth muscle — combined with its extremely …
The Journey of Amoxicillin
Breaking Bacterial Cell Walls
Amoxicillin travels from the gut as one of the best-absorbed oral penicillins, distributes broadly into tissues, and covalently acylates the …
The Journey of Apixaban
Small Molecule Factor Xa Direct Inhibitor
Apixaban is an oral pyrazolopyrimidine that is absorbed reliably from the gut with high bioavailability, distributes to inhibit both free …
The Journey of Aspirin
From Willow Bark to COX Inhibition
Aspirin begins its journey as acetylsalicylic acid dissolved in the stomach, rapidly deacetylated to salicylate, and distributed across virtually every …
The Journey of Atorvastatin
Intercepting Cholesterol Synthesis
Atorvastatin is absorbed from the small intestine, undergoes extensive first-pass hepatic extraction by OATP1B1 transporters, and competitively inhibits HMG-CoA reductase …
The Journey of Azithromycin
The Antibiotic That Accumulates
Azithromycin is absorbed orally and undergoes extraordinary tissue accumulation — reaching intracellular concentrations 100-fold above plasma — where it inhibits …
The Journey of Buprenorphine
Partial Agonist Ceiling Effect
Buprenorphine is a highly lipophilic semisynthetic opioid that is absorbed sublingually to bypass extensive oral first-pass metabolism, binds the mu-opioid …
The Journey of Carbamazepine
The Auto-Inducing Anticonvulsant
Carbamazepine is absorbed slowly and erratically from the gut, stabilizes neuronal sodium channels in their inactivated state to reduce repetitive …
The Journey of Ciprofloxacin
Trapping DNA in the Gyrase
Ciprofloxacin enters gut epithelium with good oral bioavailability, penetrates broadly into tissues including the prostate and bone, and poisons the …
The Journey of Clopidogrel
The Prodrug That Needs Two Steps
Clopidogrel is an inactive prodrug that must undergo two successive oxidative steps by hepatic cytochrome P450 enzymes — primarily CYP2C19 …
The Journey of Cyclosporine
Calcineurin Suppression for Transplants
Cyclosporine is a cyclic undecapeptide from soil fungus that is absorbed erratically from the gut, penetrates lymphocytes, binds cyclophilin to …
The Journey of Dexamethasone
The Most Potent Glucocorticoid
Dexamethasone, a synthetic fluorinated glucocorticoid with negligible mineralocorticoid activity, is absorbed or injected and binds the glucocorticoid receptor — which …
The Journey of Diazepam
Enhancing Nature's Calming Signal
Diazepam, highly lipophilic, is absorbed rapidly and distributed in a biphasic pattern — first into the brain, then redistributing into …
The Journey of Donepezil
Preserving Acetylcholine in Alzheimer's
Donepezil is absorbed completely from the gut, widely distributed to the brain, and selectively and reversibly inhibits acetylcholinesterase (AChE) in …
The Journey of Empagliflozin
Dumping Glucose in the Urine
Empagliflozin is absorbed from the gut with high oral bioavailability, reaches the proximal tubule of the kidney to inhibit SGLT2 …
The Journey of Fentanyl
Ultra-Potent Opioid Kinetics
Fentanyl's extreme lipophilicity drives it across membranes at remarkable speed, reaching the brain within minutes regardless of route, activating mu-opioid …
The Journey of Fluoxetine
Rebalancing Serotonin at the Synapse
Fluoxetine travels from gut to brain over weeks, building up in serotonergic neurons where it blocks the serotonin transporter, raising …
The Journey of Gabapentin
The Drug That Doesn't Touch GABA
Gabapentin was designed as a GABA analogue but does not bind GABA receptors or affect GABA metabolism; instead it is …
The Journey of Ibuprofen
The Reversible Pain Reliever
Ibuprofen, a propionic acid derivative, is absorbed from the intestine as a racemate, undergoes chiral inversion of its inactive R-enantiomer …
The Journey of Imatinib
The Molecule That Changed Cancer
Imatinib is the first targeted cancer therapy proven to dramatically alter the natural history of a cancer — absorbed orally …
The Journey of Insulin Glargine
Engineering a 24-Hour Depot
Insulin glargine is a recombinant human insulin analogue engineered to be soluble at the acidic pH of its formulation but …
The Journey of Levodopa
Crossing the Blood-Brain Barrier
Levodopa, the biological precursor to dopamine, is the only dopamine-related compound that can cross the blood-brain barrier via the LAT1 …
The Journey of Lisinopril
Disarming the Blood Pressure Enzyme
Unlike most ACE inhibitors, lisinopril is not a prodrug and requires no hepatic activation, reaching the angiotensin-converting enzyme in vascular …
The Journey of Lithium
The Simplest Drug with Complex Actions
Lithium, the lightest solid element and simplest possible psychiatric drug, is absorbed from the gut as the Li+ ion, distributes …
The Journey of Losartan
The First ARB and Its Active Metabolite
Losartan, the first orally active angiotensin II receptor blocker, is absorbed from the gut with modest bioavailability and is converted …
The Journey of Metformin
Glucose Control Without a Clear Target
Metformin travels from the gut absorbed by organic cation transporters into portal blood, accumulates in enterocytes and hepatocytes at concentrations …
The Journey of Metoprolol
Selective Heart Rate Control
Metoprolol is a cardioselective beta-1 adrenergic blocker that is rapidly absorbed and extensively metabolized by the highly polymorphic CYP2D6 enzyme, …
The Journey of Morphine
From Poppy to Pain Relief
Morphine's journey is a story of barriers and transformations: poorly absorbed due to its hydrophilicity, extensively metabolized to active morphine-6-glucuronide …
The Journey of Nivolumab
Fully Human PD-1 Checkpoint Blocker
Nivolumab, the first fully human anti-PD-1 monoclonal antibody approved for cancer, is infused intravenously to circulate at therapeutic concentrations and …
The Journey of Omeprazole
Acid-Activated Suicide Inhibition
Omeprazole is a prodrug that must be protected from stomach acid by enteric coating, absorbed in the small intestine, and …
The Journey of Oseltamivir
Prodrug Against Influenza
Oseltamivir is an orally administered ester prodrug that is rapidly hydrolyzed by intestinal and hepatic carboxylesterases to its active carboxylate …
The Journey of Osimertinib
Targeting T790M Mutant EGFR
Osimertinib is a third-generation EGFR tyrosine kinase inhibitor engineered to overcome resistance to first- and second-generation EGFR TKIs by forming …
The Journey of Pantoprazole
CYP-Sparing Acid Suppression
Pantoprazole is a prodrug that survives its journey to the parietal cell's acidic secretory canaliculus, where it is protonated and …
The Journey of Pembrolizumab
Unleashing the Immune System
Pembrolizumab, a humanized anti-PD-1 monoclonal antibody, is infused intravenously to circulate at high concentrations and bind the PD-1 checkpoint receptor …
The Journey of Rituximab
The First Anti-CD20 Antibody
Rituximab, the first monoclonal antibody approved for cancer, is a chimeric mouse-human IgG1 antibody that is infused intravenously and binds …
The Journey of Rivaroxaban
Direct Factor Xa Assassination
Rivaroxaban is absorbed from the gut in a dose-dependent, food-enhanced manner and circulates at high concentrations to selectively and directly …
The Journey of Rosuvastatin
The Hydrophilic Statin Advantage
Rosuvastatin, the most hydrophilic statin, relies on active organic anion transporters for hepatic uptake rather than passive diffusion, achieving high …
The Journey of Sacubitril-Valsartan
Dual Mechanism ARNI
Sacubitril-valsartan is the first angiotensin receptor-neprilysin inhibitor (ARNI), combining a prodrug neprilysin inhibitor (sacubitril) that prevents degradation of beneficial natriuretic …
The Journey of Semaglutide
The GLP-1 That Lasts a Week
Semaglutide is an engineered GLP-1 analogue that resists DPP-4 cleavage and binds albumin via a fatty acid chain to achieve …
The Journey of Sertraline
The Most Prescribed SSRI
Sertraline is absorbed from the gut with enhanced bioavailability when taken with food, distributed widely into tissues, and selectively blocks …
The Journey of Sildenafil
PDE5 Inhibition Beyond Expectations
Sildenafil was originally developed for angina but was repurposed after clinical trials revealed unexpected penile erections in male volunteers; it …
The Journey of Tacrolimus
FK506 Binding Protein and Beyond
Tacrolimus (FK506) is a macrolide lactone absorbed erratically from the gut and binds with extraordinary affinity to FK506-binding protein 12 …
The Journey of Tamoxifen
SERM Action in Breast Cancer
Tamoxifen is a prodrug that requires hepatic CYP2D6-mediated conversion to the far more potent active metabolite endoxifen; it acts as …
The Journey of Tirzepatide
Dual GIP/GLP-1 Receptor Agonist
Tirzepatide is a first-in-class dual agonist of both the glucose-dependent insulinotropic polypeptide receptor (GIPR) and GLP-1 receptor — injected subcutaneously …
The Journey of Tofacitinib
First Oral JAK Inhibitor
Tofacitinib was the first oral Janus kinase (JAK) inhibitor approved for an inflammatory disease — rapidly absorbed from the gut, …
The Journey of Trastuzumab
Targeting HER2 on Cancer Cells
Trastuzumab, a humanized IgG1 monoclonal antibody against the extracellular domain IV of HER2, is infused intravenously into patients with HER2-overexpressing …
The Journey of Vancomycin
Last Resort Peptide Wall Builder
Vancomycin, a glycopeptide antibiotic, is given intravenously because it cannot be absorbed from the gut, distributes into infected tissues, and …
The Journey of Warfarin
Walking the Tightrope of Coagulation
Warfarin is a racemic mixture of two enantiomers with different potencies and metabolic routes, absorbed completely from the gut, distributed …