Misc GI Flashcards
Glucocorticoid with low oral availability used for IBD
Budesonide
Treat severe colitis from C. difficile (2)
Vancomycin; Teicoplanin
Antibiotic that prevents tRNA binding to 30S; Treats Yersinea enterocolitica.
Tetracyclines (ex. doxy and mino)
Resistance to Tetracycline (3)
1- influx/efflux; 2 -binding site mutation; 3 - inactivation
SE to Tetracycline (4)
GI tox
photosensitivity
brown teeth during development
nepherotox (except doxy)
Why is Doxycyline not nepherotoxic?
fecal excretion
For Colon Cancer; activated by water –> crosslinks DNA by binding guanines .:. prevent replication. Attracts HMG-1 which become irreversibly bound. Ineffective repair –>apoptosis
Cisplatin
Resistance for Cisplatin (2)
1 - increased NT excision repair protein
2 - LOF in mismatch repair (HMG1
Cisplatin Tox (3)
Nephero
Oto
Nausea/Vomiting
Antiprotazoal; Treats Cryptosporidium. No resistance and few SE
nitazoxamide
What drug interferes with feredoxin oxidoreductase (PFOR)?
Nitoazoxamide
Prodrug that becomes 6-mercaptopurine
azathioprine
Drug activated by HGPRT (hypozanthine-guanine phosphoribosyltransferase)
6-MP
Which has greater bioavailability: Azathioprine or 6MP?
Azathioprine
For treatment of IBD, but takes 17 weeks for therapeutic benefic
Azathioprine and 6MP
Tox of Azathioprine and 6MP (5)
inhibits rapidly dividing cells (epithelial) N/V Bone marrow depression Hepatic Tox Teratogen
Antihelminth that opens nonselective cation channels .:. activate nicitinic AchR .:. spastic paralysis of worm
Pyrantel Pamoate
Pyrantel Pamoate Tox
neuromuscular blockade
Treats Entamoeba
MOA: chelates ferous ions essential for metabolism.
Iodoquinol
Iodoquinol tox
Not absorbed, so few SE
fully human MAB to TNF alpha
Adalimumab
chimeric MABs to TNF alpha
Infliximab
Certolizumab
Indications for Infliximab? Certolizumab? Adalimimab?
Crohn’s for all
Also Ulcerative cholitis for Infliximab
Tox for Infliximab? Certolizumab? Adalimimab?
TH1 suppression .:. increased risk infection (PPD prior)
Ab production –> hypersensitivity; serum-sickness
Hepatic failure