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↓ This week’s edition

RxMnemonic Anticholinergic
Atropine
Muscarinic Antagonist • Anticholinergic • Organophosphate Antidote
AT = acetylcholine + ROPINE = roping
Break atropine into AT (acetylcholine) and ROPINE (roping). Atropine throws a lasso and ropes acetylcholine back, so it can't reach the muscarinic receptors. With acetylcholine roped away, the parasympathetics stop working.
Atropine pharmacology mnemonic illustration
Anticholinergic AT = acetylcholine | ROPINE = roping
HOW STEP TESTS IT
1
Atropine is a competitive muscarinic antagonist. Blocking muscarinic receptors causes the anticholinergic picture: dry mouth, dilated pupils, tachycardia, hot dry skin, urinary retention, and delirium. It is used for symptomatic bradycardia and cholinesterase inhibitor poisoning.
2
Atropine blocks only muscarinic receptors, so in organophosphate poisoning it reverses secretions, bronchospasm, and bradycardia but not nicotinic muscle weakness, which needs pralidoxime. Sweat glands are sympathetic but use muscarinic receptors, which is why anticholinergic toxicity leaves skin dry.
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Today’s Question
Explanation
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Everything Step tests.
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The mnemonic breakdown - drug name decoded into a memorable anchor

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The story + image - a scene that burns the mechanism into memory

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How Step tests it - the exact clinical scenarios you'll see on exam day

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A practice question - test yourself on last week's drug before you forget

Drugs covered so far

✓ Atropine✓ Oxybutynin✓ Finasteride✓ Vasopressin✓ Paclitaxel✓ Aliskiren✓ Allopurinol✓ Digoxin✓ Esmolol✓ Raltegravir✓ Spironolactone✓ Colchicine✓ Pilocarpine✓ Baclofen✓ Memantine✓ Clonidine✓ Albuterol✓ Dobutamine✓ Warfarin✓ Dantrolene✓ Alendronate✓ Prazosin✓ Losartan✓ Nitroglycerin✓ Hydralazine✓ Heparin

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