Pharm (First Aid) Flashcards
Bethanechol
Cholinomimetic agent
Posteroperative ileus, neurogenic ileus, urinary retention.
Activates bowel and bladder smooth muscle; resistant to AChE. “Bethany, call (bethanechol) me to activate your bowels and bladder.”
Carbachol
Cholinomimetic agent
Constricts pupil and relieves intraocular pressure in glaucoma
Carbon copy of actylcholine
Methacholine
Cholinomimetic agent
Challenge test for diagnosis of asthma
Stimulates muscarinic receptors in airway when inhaled.
Highly sensitive but nonspecific measure that can detect the degree of bronchial hyperreactivity in patients suspected of having asthma. A negative methacholine challenge test can help to exclude (rule out) the diagnosis).
Pilocarpine
Cholinomimetic agent
Potent stimulator of sweat, tears, and saliva
Open-angle and closed-angle glaucoma
Contracts ciliary muscle of eye (open-angle glaucoma), pupillary sphincter (closed-angle glaucoma); resistant to AChE. “You cry, drool, and sweat on your ‘pilow.’”
Donepezil
Galantamine
Rivastigmine
Indirect cholinergic agonists (anticholinesterase)
Alzherimer disease
Increase Ach
Edrophonium
Indirect cholinergic agonists (anticholinesterase)
Historically, diagnosis of myasthenia gravis (extremely short acting). Myasthenia now diagnosed by anti-AChR Ab (anti-acetylcholine receptor antibody) test.
Increase ACh
Neostigmine
Indirect cholinergic agonists (anticholinesterase)
Postoperative and neurogenic ileus and urinary retention, myasthenia gravis, reversal of neuromuscular junction blockade (postoperative).
Increase ACh
Neo CNS = No CNS penetration
Physostigmine
Indirect cholinergic agonists (anticholinesterase)
Anticholinergic toxicity; crosses blood-brain barrier -> CNS.
Increase ACh.
Physostigmine “phyxes” atropine overdose.
Pyridostigmine
Indirect cholinergic agonists (anticholinesterase)
Myasthenia gravis (long acting); does not penetrate CNS.
Increase ACh; Increase muscle strength.
Pyridostigmine gets rid of myasthenia gravis.
Adverse effects of cholinomimetic agents
Exacerbation of COPD, asthma, and peptic ulcers
Cholinesterase inhibitor poisoning
Often due to organophosphates, such as parathion, that irreversibly inhibit AChE.
Causes Diarrhea, Urination, Miosis, Bronchospasm, Bradycardia, Excitation of skeletal muscle and CNS, Lacrimation, Sweating, and Salivation.
DUMBBELSS
Organophosphates are often components of insecticides; positing usually seen in farmers.
Antidote – atropine (competitive inhibitor) + pralidoxime (regenerates AChE if given early).
Atropine
Homatropine
Tropicamide
Muscarinic antagonist
Eye
Produce mydriasis and cycloplegia
Benztropine
Muscarinic antagonist
CNS
Parkinson disease (“park my Benz”).
Acute dystonia
Glycopyrrolate
Muscarinic antagonist
GI, respiratory
Parenteral: preoperative use to reduce airway secretions.
Oral: drooling, peptic ulcer.
Hyoscyamine
Dicyclomine
Muscarinic antagonist
GI
Antispasmodics for irritable bowel syndrome.
Ipratropium
Tiotropium
Muscarinic antagonist
Respiratory
COPD, asthma (“I pray I can breathe soon!”)
Oxybutynin
Solifenacin
Tolterodine
Muscarinic antagonist
Genitourinary
Reduce bladder spasms and urge urinary incontinence (overactive bladder)
Scopolamine
Muscarinic antagonist
CNS
Motion sickness
Atropine
Muscarinic antagonist.
Used to treat bradycardia and for ophthalmic applications.
Eye: Pupil dilation, cycloplegia
Airway: Decrease secrtions
Stomach: Decrease acid secretion
Gut: Decrease motility
Bladder: Decrease urgency in cystitis
Toxicity
Increased body temperature (due to decreased sweating); rapid pulse; dry mouth; dry, flused skin; cycloplegia; constipation; disorientation
Can cause acute angle-closure glaucoma in elderly (due to mydriasis), urinary retention in men with prostatic hyperplasia, and hyperthemia in infants.
Side effects:
Hot as a hare
Dry as a bone
Red as a beet
Blind as a bat
Mad as a hatter
Tetrodotoxin
Highly potent toxin that binds fast voltage-gated Na+ channels in cardiac and nerve tissue, preventing depolarization (blocks action potential without changing resting potential). Causes nausea, diarrhea, paresthesias, weakness, dizziness, loss of reflexes.
Treatment is primarily supportive.
Poisoning can result from ingestion of poorly prepared pufferfish, a delicacy in Japan.
Ciguatoxin
Causes ciguatera fish posioning. Opens Na+ channels causing depolarization. Symptoms easily confused with cholinergic posioning. Temperature-related dysesthesia (e.g., “cold feels hot; hot feels cold”) is regarded as a specific finding of ciguetera.
Treatment is primarily supportive.
Caused by consumption of reef fish (e.g., barracuda, snapper, moray eel).
Scombroid poisoning
Acute-onset burning sensation of the mouth, flushing of face, eruthemia, urticaria, pruritus, headache. May cause anaphylaxis-like presentation (i.e., bronchospasm, angioedema, hypotension).
Treat supportively with antihistamines; if needed, antianaphylactics (e.g., bronchodilators, epinephrine).
Caused by consumption of dark-meat fish improperly stored at warm temperature. Bacterial histidine decarboxylase converts histidine -> histamine. Histamine is not degraded by cooking. Frequently misdiagnosed as allergy to fish.
Albuterol
Salmeterol
Direct sympathomimetics
Beta-2 > Beta-1
Albuterol for acute ashtma; salmeterol for long-term asthma or COPD control.
Dobutamine
Direct sympathomimetics
Beta-1 > Beta-2, alpha
Heart failure (HF) (ionotropic > chronotropic), cardiac stress testing.
Dobutamine
Direct sympathomimetics
D1 = D2 > beta > alpha
Ustable bradycardia, HF, shock; ionotropic and chronotropic alpha effects predominate at high doses
Epinephrine
Direct sympathomimetics
Beta > alpha
Anaphylaxis, asthma, open-angle glaucoma; alpha effects predominate at high doses.
Significantly stronger effect at beta-2-receptor than norepinephrine.
Isoproterenol
Direct sympathomimetic
Beta-1 = Beta-2
Electrophysiologic evaluation of tachyarrhythias. Can worsen ischemia.
Norepinephrine
Direct sympathomimetics
Alpha-1 > Alpha-2 > Beta-1
Hypotension (but decreases renal perfusion).
Significantly weaker effect at beta-2-receptor than epinephrine.
Phenylephrine
Direct sympathomimetics
Alpha-1 > alpha-2
Hypotension (vasoconstrictor), ocular procedures (mydriatic), rhinitis (decongestant)
Amphetamine
Indirect sympathomimetics
Indirect general agonist, reuptake inhibitor, also releases stored catecholamines
Narcolepsy, obesity, ADHD
Cocaine
Indirect sympathomimetics
Indirect general agonist, reuptake inhibitor
Causes vasoconstriction and local anesthesia.
Never give beta-blockers if cocaine intoxication is suspected (can lead to unopposed alpha-1 activation and extreme hypertension).
Ephedrine
Indirect sympathomimetics
Indirect general agonist, releases stored catecholamines
Nasal decongenstion, urinary incontinence, hypotension.
Clonidine
Sympatholytic (alpha-2 agonist)
Hypertensive emergency (limited situations); dose not decrease renal blood flow
ADHD, Tourette syndrome
Toxicity: CNS depression, bradycardia, hypotension, respiratory depression, miosis
Alpha-methyldopa
Sympatholytic (alpha-2 agonist)
Hypertensionin pregnancy
Toxicity: Direct Coombs + hemolysis, SLE-like syndrome
Phenoxybenzamine
Irreversible alpha-blocker (nonselective)
Pheochromocytoma (used preoperatively) to prevent catecholamine (hypertensive) crisis.
Side effects: Orthostatic hypotension, reflex tachycardia
Phentolamine
Reversible alpha blocker (non-selective)
Give to patients on MAO inhibitors who eat tyramine-containing foods.
Side effects: Orthostatic hypotension, reflex tachycardia
Prazosin
Terazosin
Doxazosin
Tamsulosin
Alpha-1 selective blockers
(-osin ending)
Urinary symptoms of BPH; PTSD (prazosin); hyperstension (except tamsulosin)
Side effects: 1st-dose orthostatic hypotension, dizziness, headache
Mirtazapine
Alpha-2 selective blocker
Depression
Side effects: Sedation, increased serum cholesterol, increased appetite
Acebutolol
Atenolol
Betaxolol
Esmolol
Metoprolol
Beta-1-selective antagonist (Beta-1 > beta-1_
(acebutolol – partial agonist)
Selective antagonists mostly go from A to M
(Beta-1 with 1st half of alphabet)
Nadolol
Pindolol
Propranolol
Timolol
Nonselective beta antagonists (beta-1 = beta-2)
pindolol = partial agonist
Nonselective antagonists mostly go from N to Z
Carvedilol
Labetalol
Nonselective alpha and beta antagonists
Nonselective alpha and beta antagonists have modified suffixes (instead of “olol”)
Nebivolol
Combines cardiac selective beta-1-adrenergic blockade with stimulation of beta-3 receptors, which activate nitric oxide synthase in the vasculature.
Acetaminophin: antidote
N-acetylcysteine (replenishes glutathione)
AChE inhibitors, organophosphates: antidotes
Atropine > pralidoxime
Amphetamines (basic): antidote
NH4Cl (acidify urine)
Antimuscarinic, anticholinergic agents: antidotes
Physostigmine salicylate, control hyperthermia
Benzodiazepines: antidote
Flumazenil
Beta-blockers: antidote
Glucagon
Carbon monoxide: antidote
100% O2, hyperbaric O2
Copper, arsenic, gold: antidote
Penicillamine
Cyanide: antidote
Nitrite + thiosulfate, hydroxocobalamin
Digitalis (digoxin): antidote
Anti-dig Fab fragments
Heparin: antidote
Protamine sulfate
Iron: Antidote
Deferoxamine, deferasirox
Lead: Antidote
EDTA
dimercaprol
succimer
penicillamine
Mercury, arsenic, gold: Antidote
Dimercaprol (BAL)
succimer