Pharmacology Drug Interactions and Safety: A 50-Flashcard Study Guide
Study drug interactions and safety: enzyme induction and inhibition, synergism, loading doses, clearance, plus six real drug pairs the deck leaves out.
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If you open GI3583 – Pharmacology: Drug Interactions & Safety expecting a list of dangerous drug combinations, you will be surprised. Only about 8 of its 50 cards deal with interactions. The rest is a solid tour of general pharmacology: molecular targets, dose-response, pharmacokinetics and dosing. That is useful material, as long as you study it in the right order.
Study this deck: Pharmacology: Drug Interactions & Safety
1 / 10Therapeutic drug monitoring
Tap the card for the answer · swipe right if you knew it, left if not
The three blocks inside the deck
- Cards 1-35: how drugs act. Therapeutic drug monitoring, Loewe additivity, the Hill equation, the Cheng-Prusoff equation, Schild regression, dose-response curves, the cholinergic synapse (muscarine, atropine, hemicholinium), the three target types, GPCRs, ligand-gated ion channels, receptor tyrosine kinases, covalent vs reversible binding, intrinsic activity, lipophilicity, first-pass metabolism, the blood-brain barrier, full vs partial agonists, and competitive antagonism.
- Cards 36-42 and 50: interactions. Enzyme induction, enzyme inhibition, pharmacodynamic vs pharmacokinetic interactions, synergism, antagonism, additive effect, cytochrome P450.
- Cards 43-49: dosing. Steady state, loading dose, maintenance dose, accumulation, plasma protein binding, renal and hepatic clearance.
Study block 3 before block 2. You can't understand why an enzyme inhibitor is dangerous until you know that it lowers clearance and raises the steady-state level.
Cards worth memorizing word for word
| Front | Back |
|---|---|
| Enzyme inhibition in drug interactions | One drug blocks the enzymes that metabolize another, increasing the second drug's concentration and effects |
| Pharmacokinetic drug interactions | One drug affects the absorption, distribution, metabolism, or excretion of another |
| Synergism | Combined effect greater than the sum of the individual effects |
| Loading dose | An initial higher dose to reach therapeutic levels quickly before maintenance dosing |
| Steady-state concentration | Reached when the administration rate equals the elimination rate |
| Partial agonist vs full agonist | A partial agonist gives a submaximal response even with all receptors occupied |
| Which drugs need therapeutic drug monitoring? | Narrow-margin drugs such as warfarin, antiepileptics, and aminoglycosides |
| Why do anti-cancer drugs have narrow margins? | Toxic side effects almost always appear at tumor-killing doses |
Two cards to rewrite
- Card 32 says the "certain safety factor" is another name for the therapeutic index. It isn't. The therapeutic index is TD50/ED50. The certain safety factor is LD1/ED99, a stricter margin designed to account for overlapping dose-response curves.
- Card 13 uses sarin, a chemical weapon, as its example of an anticholinesterase. Keep it, and add the clinical examples you will actually meet in practice: neostigmine, pyridostigmine, donepezil.
Card 17 (the epigenetic clock) has nothing to do with drug safety. Suspend it.
Tip: write the interactions the title promises
The deck names the mechanisms but never gives a real drug pair. Add six cards in the format pair → mechanism → consequence:
- Clarithromycin + simvastatin → CYP3A4 inhibition → myopathy risk
- Rifampin + oral contraceptives → enzyme induction → contraceptive failure
- Grapefruit juice → gut-wall CYP3A4 inhibition → higher levels of some statins
- Warfarin + NSAIDs → pharmacodynamic interaction → bleeding
- SSRI + tramadol or linezolid → serotonin syndrome
- Two QT-prolonging drugs → additive effect → torsades de pointes
These cards turn the abstract terms (inhibition, induction, additive, synergism) into exam-ready answers.
Related study guides
This deck overlaps very little with our pharmacology fundamentals guide (only one shared card), so you can study the two side by side.
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