pharm Flashcards
bethanicol
cholinergic: direct agonist.Tx: ileus, urinary retention. activates bowel and bladder smooth muscle. resistant to AChE
carbachol
cholinergic: direct agonist. Tx: constricts pupil and relieves intraocular pressure in glaucoma. = carbon copy of ACh
methacholine
cholinergic: direct agonist. Tx: challenge test for Dx of asthma. stimulates muscarinic receptors in airway when inhaled.
pilocarpine
cholinergic: direct agonist. Tx: potent stimulator of sweat, tears, and saliva. open-angle and closed-angle glaucoma. contracts ciliary muscle of eye (open-angle), pupillary sphincter (close-angle). resistant to AChE.
donepezil, galantamine, rivastigmine
cholinergic: indirect agonist (anticholinesterase). Tx: AD.
edrophonium
cholinergic: indirect agonist. Tx: historical Dx for MG. extremely short-acting
neostigmine
cholinergic: indirect agonist. Tx: ileus, urinary retention, MG, reversal of NMJ blockade. neo (no) CNS penetration
physostigmine
cholinergic: indirect agonist. Tx: ACh toxicity. crosses BBB. phyxes overdose
pyridostigmine
cholinergic: indirect agonist. Tx: MG. long acting. no CNS penetration.
w/cholinomimetics, watch out for…
COPD, asthma, PUD flairs
Sx of cholinesterase inhibitor poisoning
DUMBBELSS: Diarrhea, Urination, Miosis, Bronchospasm, Bradycardia, Excitation (skeletal muscle and CNS), Lacrimation, Sweating, Salivation.
cause of cholinesterase inhibitor poisoning
organophosphates (parathion)
atropine, homatropine, tropicamide
muscarinic antagonists. target: eyes. -> mydriasis + cycloplegia. also used to Tx bradycardia.
benztropine
muscarinic antagonist. target: CNS. Tx: PD, acute distonia
glycopurrolate
muscarinic antagonist. target: GI, respiratory. Tx: parenteral: preop -> dec. airway secretions. oral: drooling, PUD.
hyoscyamine, dicyclomine
muscarinic antagonist. target: GI. Tx: antispasmodics for IBS
ipratropium, tiotropium
muscarinic antagonist. target: respiratory. Tx: COPD, asthma
oxybutynin, solifenacin, tolterodine
muscarinic antagonist. target: GU. Tx: reduce bladder spasms and urge incontinence
scopalamine
muscarinic antagonist. target: CNS. Tx: motion sickness
effects of muscarinic antagonists:
inc. pupil dilation, dec. secretions, dec. acid secretion, dec. motility, dev. urge in cystitis
muscarinic antagonist toxicity
hot as a hare, dry as a bone, red as a beet, blind as a bat, mad as a hatter. can cause acute angle glaucoma.
tetrodotoxin
in fugu. binds fast V-gates Na channels -> N/D, paresthesias, weakness, dizziness, loss of DTRs. Tx: supportive
ciguatoxin
reef fish (baracuda, snapper, moray eel). opens Na channels -> depolarization. Sx: confused w/cholinergic poisoning. temperature dysesthesia. Tx: supportive
scombroid poisoning
dark-meat fish. bacterial histidine decarboxylase converts histidine -> histamine. mimics fish allergy. -> mouth burning, face flushing, erythema, urticaria, pruritus, h/a. can look like anaphylaxis (bronchospasm, angioedema, hypotension. Tx: supportive, antihistamines, antianaphylactics if needed).
albuterol, salmeterol
sympathomimetic. beta2>beta1. salmeterol = LABA.
dobutamine
sympathomimetic. beta1>beta2, alpha. Tx: HF, inotropic > chronotropic. cardiac stress-test.
dopamine
sympathomimetic. D1 = D2>beta>alpha. Tx: unstable bradycardia, HF, inotropic + chronotropic alpha effects predominate at high doses.
epinephrine
sympathomimetic. beta>alpha. Tx: anaphylaxis, asthma, open-angle glaucoma, alpha effects predominate at high doses. stronger beta2 than NE
isoproterenol
sympathomimetic. beta1=beta2. Tx: electrophysiologic eval of tachyarrhythmias. can worsen ischemia.
NE
sympathomimetic. alpha1>alpha2>beta1. Tx: hypotension (but decreases renal perf), significantly weaker effect at beta2 than NE
phenylephrine
sympathomimetic. alpha1>alpha2. Tx: hypotension (vasoconstrictor), ocular procedures (mydriatic), rhinitis (decongestant).
amphetamine
indirect sympathomimetic: agonist, reuptake inhibitor, releases stores catecholamines. Tx: narcolepsy, obesity, ADHD
cocaine
indirect adrenergic agonist, reuptake inhibitor. -> vasoconstriction and local anesthesia. never give beta-blockers if cocaine intoxication is suspected (-> unopposed alpha1 activation -> extreme HTN)
ephedrine
indirect adrenergic agonist, releases stored catecholamines. Tx: nasal decongestion, urinary incontinence, hypotension
NE vs. isoproterenol: NE
inc. BP via alpha1 vasocontriction -> inc. MAP -> reflex bradycardia
NE vs. isoproterenol: isoproterenol
little alpha effect. causes beta2-mediated vasodilation -> dec. MAP + inc. HR via beta1 and reflex activity
clonidine
Tx: hypertensive urgency. does not decrease renal blood flow. ADHD, tourettes. toxicity: CNS depression, bradycardia, hypotension, respiratory depression, meiosis
alpha-methydopa
Tx: HTN in pregnancy. toxicity: direct coombs + hemolysis, SLE-like syndrome
phenoxybenzamine
irreversible alpha-blocker. Tx: pheo (preop). side effects: orthostatic hypotension, reflex tachycardia
phentolamine
reversible alpha-blocker. Tx: give to pts on MAO inhibitors who eat tyramine-containing foods. side effects: orthostatic hypotension, reflex tachycardia
prazosin, terazosin, doxazosin, tamsulosin
selective alpha1 blocker. Tx: urinary Sx of BPH, PTSD (prazosin), HTN (except tamsulosin). side effects: 1st dose orthostatic hypotension, dizziness, h/a
mirtazepine
selective alpha2 blocker. Tx: depression. side effects: desation, inc. serum cholesterol, inc. appetite
timolol
beta blocker used to dec. secretion of aqueous humor to treat glaucoma
beta blocker toxicity
impotence, CV (bradycardia, AV block, HF), CNS (seizures, sedation. sleep alterations), dyslipidemia (metop), and asthma/COPD. avoid after cocaine use!
selective beta1 blockers
acebutolol (partial), atenolol, betaxolol, esmolol, metoprolol (A-M = 1st 1/2 of alphabet)
nonselective beta blockers
nadolol, pindolol (partial), propranolol, timolol. (N-Z = 2nd 1/2 of alphabet)
nonselective alpha and beta blockers
carvedilol, labetalol (don’t quite end in olol)
nibivolol
combines cardiac-selective beta1 blockade w/stimulation of beta3-receptors, which activate NO synthase in the vasculature
acetaminophen antidote
n-acetylcysteine (replenishes glutathione)
AchE inhibitor/organophosphate antidote
atropine > pralidozime
amphetamine (basic) antidote
NH4Cl (acidify urine)
antimuscarinic anticholinergic antidote
physostigmine salicylate: control hyperthermia
benzo antidote
flumazenil
beta-blocker antidote
glucagon
Cu, As, Au antidote
penicillamine
cyanide antidote
nitrite + thiosulfate, hydroxocobalamin
digitalis antidote
anti-dig Fab fragments
heparin antidote
protamine sulfate
iron antidote
deferoxamine, deferasirox
lead antidote
EDTA, dimercaprol, succimer, penicillamine