Mechanisms Flashcards
Alpha receptor agonists and antagonists
Agonists = phenylephrine (sinus congestion) antagonists = doxazosin/ tamsulosin (HTN/ BPH)
Beta 1 receptor agonists and antagonists
agonists = NA antagonists = all beta blockers eg atenolol + bisoprolol
Beta 2 receptor agonists and antagonists
agonists = salbutamol antagonists = non selective beta blockers eg propranolol
Dopamine receptor agonists and antagonists
Agonist = parkinsons drugs Antagonists = anti-emetics, antipsychotics
GABA receptor agonists and antagonists
agonists = benzodiazepines antagonists = NA (used in benzo OD)
H2 + H1 receptor agonists and antagonists
H2 antagonists = ranitidine (dyspepsia)
H1 antagonist = hayfever meds
muscarinic receptor agonists and antagonists
agonists = pilocarpine (for glaucoma) antagonists = atropine, ipratropium bromide (used for urge incontinence)
Zero order kinetics
Metabolism which is independent of concentration of reactant
Due to metabolic pathways becoming saturated
Phenytoin
High dose aspirin
Heparin
Ethanol
PPI action
Inhibit H+/ K+ ATPase that transports H+ out of parietal cells
What part of the brain is infarcted if you get hemiplegia/ hemiparesis?
Internal capsule
Opioid agonists + antagonists
Agonists = opioids + loperamide
Side effects of bisphosphonates
Jaw osteonecrosis
Oesophagitis - take sitting up
Serotonin antagonists + agonists
Antagonists: used for N+V in chemo
Agonists = rescue meds for migraine
Monitoring while on methotrexate
FBC, LFT, U+E
Action of LMWH
Inhibits factor Xa