PHARMACOKINETICS FOR EVERYONE
See How Drugs Move
Through Your Body
Visualize drug absorption, half-life, and elimination with beautiful, interactive simulations. Explore 35+ common drugs with clinically accurate data.
HALF-LIFE IN ACTION
t½ ≈ 5 hCaffeine 200 mg — elimination over 20 hours
Each half-life removes 50% of the remaining drug. After five half-lives (≈25 h for caffeine), <3% remains — considered clinically eliminated.
WHY HALFLIFE
Pharmacokinetics made visible
35+ Common Drugs
From caffeine to prescription medications, explore accurate half-life data sourced from clinical pharmacokinetic references.
Multi-Dose Simulation
See how drug levels build up with repeated dosing and reach steady state — the way pharmacists actually think about it.
Built by a Pharmacist
Every calculation is backed by real pharmacokinetic data and clinical knowledge, not guesswork or Wikipedia.
Clinical Accuracy
Half-life values are drawn from peer-reviewed literature and standard references such as Goodman & Gilman and Clinical Pharmacokinetics.
HOW IT WORKS
Three steps to understanding
Pick a Drug
Choose from 35+ common medications or enter a custom half-life value.
Set Your Schedule
Define dose amount, frequency, and number of doses to simulate.
See the Science
Watch an interactive concentration-time curve render in real time.
QUICK REFERENCE
Common drug half-lives at a glance
Half-life values from peer-reviewed pharmacokinetic literature. Click any drug to simulate it.
| Drug | Half-Life | Dosing Frequency | Category | Simulate |
|---|---|---|---|---|
| Caffeine | 3–7 h | As needed | Stimulant | View → |
| Ibuprofen | 2 h | Q6H | Pain Relief | View → |
| Acetaminophen | 2–3 h | Q4–6H | Pain Relief | View → |
| Aspirin | 0.25 h* | Varies | Pain Relief | View → |
| Fluoxetine | 1–6 days | Daily | Mental Health | View → |
| Amoxicillin | 1.5 h | Q8H | Antibiotic | View → |
| Warfarin | 20–60 h | Daily | Cardiovascular | View → |
| Metformin | 4–9 h | Q12H | Metabolic | View → |
* Aspirin's pharmacological effect lasts far longer than its 15-minute plasma half-life because it irreversibly inhibits COX enzymes. Platelet effects persist for the platelet's entire 7–10 day lifespan.
POPULAR DRUGS
Start with something familiar
The world's most used stimulant. Found in coffee, tea, and energy drinks.
Common pain reliever sold as Tylenol. Rapid onset, moderate duration.
NSAID anti-inflammatory. Short half-life means frequent dosing.
Antidepressant (Prozac). Exceptionally long half-life simplifies dosing.
Sleep hormone. Clears quickly — timing your dose matters.
Alcohol metabolism follows zero-order kinetics at typical doses.
Benzodiazepine (Xanax). Intermediate half-life in the benzo class.
Broad-spectrum antibiotic. Short half-life drives the Q8H dosing schedule.
Anticoagulant with wide half-life variability due to genetic polymorphism.
LEARN
Understand the science
Pharmacist-written guides that explain the concepts behind the simulator, without the textbook jargon.
What is Drug Half-Life?
The foundational concept explained simply: what the t½ number means, why it matters for dosing, and how your body eliminates drugs.
Read article →Pharmacokinetics 101
Absorption, distribution, metabolism, excretion — the four pillars of pharmacokinetics and how they shape the concentration-time curve.
Read article →Understanding Steady State
Why drugs need several doses to reach stable blood levels, and how half-life predicts exactly when that happens.
Read article →The Science Behind Caffeine
A deep dive into caffeine pharmacokinetics: why your afternoon coffee disrupts sleep, and what a 5-hour half-life really means in practice.
Read article →Ready to see the science?
No account required. No download. Open the simulator and start exploring exactly how medications behave inside the body.