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Cholinergics III - AChE inhibitors and few others
IUSM
15
Pharmacology
Professional
03/05/2015

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Term
donepezil
Definition
Class: acetylcholinesterase inhibitor, noncovalent

Mechanism: blocks anionic site from binding Ach (prevent best binding for enzymatic action), centrally acting

Indication: Alzheimer's dz (improve cognition and global clinical fx, delay symptomatic progression for up to 1yr)

Adverse Effects: relatively mild, nausea, diarrhea,
Term
edrophonium
Definition
Class: acetylcholinesterase inhibitor, noncovalent

Mechanism: blocks active site from binding Ach, does not enter CNS, 2-10min duration

Indication: diagnosis test of myasthenia gravis (Tensilon test)

Adverse Effects: relatively mild, nausea, diarrhea
Term
memantine
Definition
Class: alzheimer drug

Mechanism: NMDA receptor antagonist, may be neuroprotective

Indication: Alzheimer disease (small effect on cognition and global clinical fx)

Adverse Effects: dizziness, increase agitation, delusion behaviors
Term
neostigmine
Definition
Class: AChE inhibitor, reverisble carbamate inhibitor

Mechanism: occupy the enzymatic site of AChE, hydrolyzed from enzyme more slowly --> fewer sties available for ACh cleavage; DOES NOT CROSS BBB

Indication:
1. increase transmission at NMJ (myasthenia gravis, eaton-lambert sydnroe, tubocurare poisoning)
2. increase PSNS tone (PARALYTIC ILEUS, post-up urinary retention or bladder distention)

Contraindication: bronchial asthma, urinary or GI obstruction

Adverse Effects: nausea and diarrhea esp, other excess muscarinic activity
Term
physotigmine
Definition
Class: AChE inhibitor, reverisble carbamate inhibitor

Mechanism: occupy the enzymatic site of AChE, hydrolyzed from enzyme more slowly --> fewer sties available for ACh cleavage; ENTERS CNS

Indication:
1. increase transmission at NMJ (myasthenia gravis, eaton-lambert sydnroe, tubocurare poisoning)
2. increase PSNS tone (post-up urinary retention or bladder distention)
3. ANTIDOTE for CENTRAL ANTIMUSCARINIC POISONING
4. glaucoma - not first line

Contraindication: bronchial asthma, urinary or GI obstruction

Adverse Effects: nausea and diarrhea esp, other excess muscarinic activity
Term
pyridostimine
Definition
Class: AChE inhibitor, reverisble carbamate inhibitor

Mechanism: occupy the enzymatic site of AChE, hydrolyzed from enzyme more slowly --> fewer sties available for ACh cleavage; DOES NOT CROSS BBB

Indication:
1. increase transmission at NMJ (myasthenia gravis, eaton-lambert sydnroe, tubocurare poisoning)
2. increase PSNS tone (post-up urinary retention or bladder distention)

Contraindication: bronchial asthma, urinary or GI obstruction

Adverse Effects: nausea and diarrhea esp, other excess muscarinic activity
Term
echothiophate
Definition
Class: AChE inhibitor, organophosphorous compound, therapeutic

Mechanism: substrate of AChE that forms stable practically permanent enzyme-substrate complex, leaves phosphorylate group on enzyme

Indication: topical only for glaucome (not first-line)

Adverse Effects: fixed pupils, blurred vision (can't accomodate)
Term
malathion
Definition
Class: AChE inhibitor, organophosphorous compound, pesticide

Mechanism: substrate of AChE that forms stable practically permanent enzyme-substrate complex, leaves phosphorylate group on enzyme

Indication: insecticide

Adverse Effects:
1. depolarizing blockade (nicotinic): NMJ blockade --> muscle weak --> respiratory failure --> death
2. hyperactivity (muscarinic): peripheral PSNS --> bradycardia --> arrhythmias/arerest --> death
3. hyperactivity (muscarinic): excessive airway secretion and constriction --> asphyxiation --> death
4. hyperactivity (muscarinic): CNS --> decreased respiratory drive --> respiratory failure --> death
5. hyperacitivty (muscarinic): CNS --> generalized seizures --> convulsions --> death
Term
parathion
Definition
Class: AChE inhibitor, organophosphorous compound, pesticide

Mechanism: substrate of AChE that forms stable practically permanent enzyme-substrate complex, leaves phosphorylate group on enzyme

Indication: insecticide

Adverse Effects:
1. depolarizing blockade (nicotinic): NMJ blockade --> muscle weak --> respiratory failure --> death
2. hyperactivity (muscarinic): peripheral PSNS --> bradycardia --> arrhythmias/arerest --> death
3. hyperactivity (muscarinic): excessive airway secretion and constriction --> asphyxiation --> death
4. hyperactivity (muscarinic): CNS --> decreased respiratory drive --> respiratory failure --> death
5. hyperacitivty (muscarinic): CNS --> generalized seizures --> convulsions --> death
Term
sarin
Definition
Class: AChE inhibitor, organophosphorous compound, weapon

Mechanism: substrate of AChE that forms stable practically permanent enzyme-substrate complex, leaves phosphorylate group on enzyme

Indication: nerve gas

Adverse Effects:
1. depolarizing blockade (nicotinic): NMJ blockade --> muscle weak --> respiratory failure --> death
2. hyperactivity (muscarinic): peripheral PSNS --> bradycardia --> arrhythmias/arerest --> death
3. hyperactivity (muscarinic): excessive airway secretion and constriction --> asphyxiation --> death
4. hyperactivity (muscarinic): CNS --> decreased respiratory drive --> respiratory failure --> death
5. hyperacitivty (muscarinic): CNS --> generalized seizures --> convulsions --> death
Term
VX
Definition
Class: AChE inhibitor, organophosphorous compound, weapon

Mechanism: substrate of AChE that forms stable practically permanent enzyme-substrate complex, leaves phosphorylate group on enzyme

Indication: nerve gas

Adverse Effects:
1. depolarizing blockade (nicotinic): NMJ blockade --> muscle weak --> respiratory failure --> death
2. hyperactivity (muscarinic): peripheral PSNS --> bradycardia --> arrhythmias/arerest --> death
3. hyperactivity (muscarinic): excessive airway secretion and constriction --> asphyxiation --> death
4. hyperactivity (muscarinic): CNS --> decreased respiratory drive --> respiratory failure --> death
5. hyperacitivty (muscarinic): CNS --> generalized seizures --> convulsions --> death
Term
atropine
Definition
Class: antimuscarinic

Mechanism: muscarinic antagonist; CAN ACCESS CNS

Indication: blocks the effects of organophosphorus compounds at muscarinic receptors (decreases death via their hyperactivity)
Term
pralidoxime (2-PAM)
Definition
Class: cholinergic

Mechanism: strong nucleophile, yanks organophosphates off of AChE --> frees it up to degrade the excessive AC; no access to CNS

Indication: use to treat peripheral affects of organophosphate poisoning
Term
effects of elevated ACH
Definition
misosis
bronchocontriction
GI stimulation
micturition
bradycardia
sweating
depolarizing NMJ blockade - paralysis
convulsions
Term
DUMBELS
Definition
excessive ACH side effects
Diarrhea
Urination
Miosis
Bronchospasm/Bradycardia
Emesis
Lacrimation
Salivation/Sweating
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