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PCol II Exam 4
Thyroid, GIT, Cancer
109
Pharmacology
Graduate
04/29/2013

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Term
Three Processes of TPO
Definition
1.) oxidize iodide to iodine
2.) attach I to thyroglobulin
3.) couple MIT/DIT to create T3/T4
Term
levothyroxine (4 brand names)
DDI, ADR, MOA
Definition
Synthroid, Levothroid, Unithroid, Levoxyl
MOA: synthetic T4
DDI: minerals (take am preprandially)
ADR: insomnia, tachy<3
Term
liothyronine
Definition
Cytomel
Synthetic T3
Term
liotrix
Definition
Thyrolar
Synthetic T3/T4 mix
Term
dessicated thyroid
Definition
Armour Thyroid
Term
methimazole
MOA, OOA, ADR
Definition
MOA: inhibit TPO (3 fxn)
OOA: delayed due to thyroid gland stores; T4 t1/2
ADR: alopecia, arthralgia, agranulocytosis
Term
propylthiouracil (PTU)
MOA, OOA, ADR
Definition
MOA: inhibit TPO & 5'de-iodonase
OOA: delayed
ADR: alopecia, arthralgia, agranulocytosis
Term
thiocyanate
Definition
ionic thyroid gland inhibitor
blocks I- symporter
byproduct of nitroprusside detox
Term
perchlorate
Definition
ionic thyroid gland inhibitor
blocks I- symporter
Term
excess iodide (2 brand names)
MOA, OOA, Use (&offlabel)
Definition
Lugol's Solution, SSKI
MOA: "freeze" thyroid gland
OOA: immediate
Use: thyroid storm, expectorant, prevent radiation absorption
Term
Radioactive Iodine
MOA, C.I.
Definition
MOA: uptaken into gland -> kills cells -> give levothyroxine
C.I.: pregnancy, children
Term
omalizumab
MOA, (-)
Definition
Xolair
MOA: binds IgE to prevent mast cell implantation
(-): $$$$$
Term
cromolyn
Definition
mast cell stabilizer
Term
nedocromyl
Definition
mast cell stabilizer
Term
epinephrine
MOA, use
Definition
MOA: alpha-1 -> vasocon; beta-2 -> bronchodil
Use: anaphylaxis (hypoTN, bronchocon)
Term
diphenhydramine
Definition
Benadryl
1st Gen H-1 Antag
Term
clemastine
Definition
Tavist
1st Gen H-1 Antag
Term
dimenhydrinate
Definition
Dramamine
1st Gen H-1 Antag
Term
chlorpheniramine
Definition
Chlor-Trimeton
1st Gen H-1 Antag
Term
brompheniramine
Definition
1st Gen H-1 Antag
Term
hydroxyzine (2)
Definition
Atarax, Vistaril
1st Gen H-1 Antag & antiemetic
Term
cyclizine
Definition
1st Gen H-1 Antag
Term
meclizine
Definition
Antivert
1st Gen H-1 Antag & anti-emetic
Term
promethazine
Definition
Phenergan
1st Gen H-1 Antag & anti-emetic
Term
cyproheptadine
Definition
Periactin
1st Gen H-1 Antag & 5HT2 Antag for serotonin syndrome
Term
doxepin
Definition
1st Gen H-1 Antag & TCA
Term
loratidine
Definition
Claritin
2nd Gen H-1 Antag
Term
desloratidine
Definition
Clarinex
2nd Gen H-1 Antag
Term
cetirizine
Definition
Zyrtec
2nd Gen H-1 Antag
Term
azelastine
Definition
Astelin
2nd Gen H-1 Antag
Term
fexofenadine
Definition
Allegra
2nd Gen H-1 Antag
Term
misoprostol
MOA
Definition
Cytotec
PGE2 agonist ->
on proton pump: decrease p+
on mucus cell: increase mucus & bicarb
Term
Arthrotec
Definition
misoprostol + NSAID (why.)
Term
sucrasulfate
MOA, ADR, DDI
Definition
MOA: activated by acid!!; attaches to ulceration
-take before meal
ADR: constipation
DDI: binds other drugs (esp digoxin) so space out
Term
H2 Blockers ADRs
Definition
Overcompensation -> Tolerance
while histamine is blocked, G cell releases more gastrin -> more histamine is released -> histamine competes with antag
Rebound acidity: if sudden d/c; too much histamine all binds
Term
cimetidine
Definition
Tagamet
H2 Blocker
*DON'T USE! CYP inhibition decreases cholesterol -> androgens
Term
ranitidine
Definition
Zantac
H2 Blocker
Term
nizatidine
Definition
Axid
H2 Blocker
Term
famotidine
Definition
Pepcid
H2 Blocker
Term
G Cells
Definition
Produce gastrin; blocked by SST
Term
D Cells
Definition
Produce SST to inhibit gastrin
Term
ECL Cells
Definition
produce histamine in response to gastrin binding CCK recep
Term
3 Anti-emetic 1st Gen H-1 Antags
Definition
promethazine, meclizine, hydroxyzine
Term
4 Receptors on P+Pump
Definition
1.) CCK: activated by gastrin -> increase P+
2.) M2: activated by PNS -> increase P+
3.) H2: activated by histamine -> increase P+
4.) PG: activated by PGE2 -> decrease P+
Term
PPIs
MOA, OOA, ADR, Formulation
Definition
MOA: absorbed in GIT -> blood -> parietal cell -> activated by acid -> covalently binds p+pump
OOA: delayed
ADR: risk for CAP, HA, Diarrhea, reduced Ca++ absorp
*enteric-coated to avoid local stomach axn
Term
omeprazole (2)
DDI
Definition
Prilosec, Zegerid
DDI: CYPi -> decreased efficacy of Plavix (prodrug)
Term
esomeprazole
Definition
Nexium
PPI
Term
lanzoprazole
Definition
Prevaid
PPI
Term
dexlansoprazole
Definition
Kapidex
PPI
Term
rabeprazole
Definition
Aciphex
PPI
Term
pantoprazole
Definition
Protonix
PPI
Term
metaclopromide
Use
MOA (2)
ADR
Definition
Use: GERD, Anti-Emetic
MOA:
1.) D2 Blocker -> increase sphincter tone & prokinetic
2.) 5HT3 Blocker -> (brain) decrease CTZ stim, (GIT) decrease CTZ signal
ADR: longterm -> EPS, tardive dyskinesia
Term
GERD & Vomiting & IBS Receptors (5)
Definition
1.) D2
in Brain: CTZ stim -> N/V
in Upper GIT: decreased sphincter tone&peristalsis
2.) 5HT3
in Brain: CTZ stim -> N/V
in Upper GIT: 5HT storing cells -> nerve signal to CTZ
in Lower GIT: increase secretion & motility
3.) NK-1
in Brain: CTZ stim -> immediate vomit (substance P)
in GIT: we dk
4.) CB-1 (cannabinoid)
in Brain: anti-emesis, analgesia, euphoria (THC)
5.) H1 & Muscarinic
in vestibular apparatus -> motion sickness
Term
D2 Antagonists
Use, MOA, ADR, Selectivity
Definition
Use: 1st Line anti-emetics
MOA: decreased vomit reflex, increased sphincter tone&prokinetic
ADR: EPS, Tardive Dyskinesia
Nonselective -> H1 & Muscarinic antag -> decreased motion sickness
Term
prochlorperazine
Definition
Compazine
D2 Antag
Term
trimethobenzamide
Definition
Tigan
D2 Antag
Term
promethazine
Definition
Phenergan
D2 Antag, H1 Antag
Term
5HT3 Antagonists
Use, MOA, ADR
Definition
Use: 1st Line CINV
MOA: block CTZ stim; block CTZ signal
ADR: constipation, dizziness
Term
ondansetron
Definition
Zofran
5HT3 Antag
Term
granisetron
Definition
Kytril
5HT3 Antag
Term
dolasetron
Definition
Azemet
5HT3 Antag
Term
palanosetron
Definition
Aloxi
5HT3 Antag
Term
arepipant
Use, MOA, Admin ADR
Definition
Emend
NK-1 Antag
Use: CINV
MOA: block CTZ
Admin: must give before chemo (then after)
ADR: fatigue, loss of appetite
Term
CB-1 agonists
Use
MOA
ADR
Definition
Use: Last resort CINV
MOA: prevents emesis
ADR: tachycardia, euphoria, dependence/withdrawal
Term
dronabinol
Definition
Marinol
CB-1 Ag
Term
nabilone
Definition
Cesamet
CB-1 Ag
Term
alosetron
Definition
Lotronex
5HT3 Antag
Use: IBS-D
MOA: blocks Lower GIT receptor -> decreased secretion & motility
Term
lubiprostone
Definition
Amitizia
Use: IBS-S
MOA: activate GIT Cl channels to increase secretion
Term
7 Mechanisms of Cancer Resistance
Definition
1.) decreased uptake by drug transporter
2.) Pgp efflux pump overexpression (multidrug)
3.) increased/mutated drug target
4.) repaire of dna damage
5.) drug metabolism
6.) change in membrane lipids
7.) compartmentalization (drug cannot reach hypoxic core)
Term
Mechanisms of DNA Repair (3)
Definition
1.) Base Excision Repair: remove mismatched base (glycosylase); replace with new (dnapol); religate. Cell cycle arrest will occur if mech is overwhelmed
2.) Mismatch Repair: proteins identify mismatch & replace large sections. If damage is too great it will trigger apoptosis
3.) Nonhomo Endjoining Repair: reseals ds break
Term
mechloroethamine
Definition
Nitrogen Mustard alkylating agent
Term
Alkylating Agents
MOA
Definition
Activated in vivo by CYP -> covalently bind with SH, N, O (commonly N7 guanine) -> crosslinks DNA
Term
chlorambucil
Definition
Nitrogen Mustard alkylating agent
Term
melphalan
Definition
Nitrogen Mustard alkylating agent
Term
cyclophosphamide
& prodrug iphosphamide
Definition
Nitrogen Mustard alkylating agent
metabolism:
1.) aldehyde dehydrogenase -> inactive
2.) nonenz -> acrolein
*Acrolein accum -> hemorrhagic cystitis. Hydrate & give MESNA (free -SH detoxes)
Term
Nitrogen Mustard unique resistance
Definition
Upregulation of enz that synth Glutathione -> inactivates active metabolite
Term
carmustine
Definition
nitrosourea alkylating agent
Term
lomustine
Definition
nitrosourea alkylating agent
Term
decarbazine
Definition
triazene alkylating agent
Term
temozoloamide
Definition
PO triazene alkylating agent
Term
cisplatin
toxicity
Definition
platinum compound
tox: irreversible nephrotox due to glomerular filtration & copper transporters (run NS before & after)
Term
carboplatin
toxicity
Definition
platinum compound
tox: neutropenia
Term
oxaliplatin
toxicity
Definition
platinum compound
tox: neurotoxicity
Term
Cisplatin Mechanisms of Resistance (6)
Definition
1.) uptake defect (mutation of copper transporter)
2.) increased efflux
3.) glutathione inactivation
4.) P53 mutation (prevents apoptosis)
5.) increased dna repair
6.) replicative bypass
Term
methotrexate
MOA(3), Toxicity in RA, Cancer
Definition
MOA:
1.) inhibit DHFR (converstion of DHF->THF for use in converting dUMP to TMP by TS)
2.) inhibit TS directly
3.) inhibit enzymes of purine synthesis
-> therefore inhibits purines & pyrimidines both
Tox; hepatotoxicity
RA Tox: (chronic PO dose): give folic acid
Cancer Tox: (high dose IV): give leukovorin rescue w/in 24-48 hours to replenish THF
Term
TMPT
Definition
inactivates 6MP & 6TG
-genetic testing: phenotype (rbc) & genotype
Term
XO
Definition
inactivates 6MP
-gout pt can get neutropenia if dose not adjusted
Term
HGPRT
Definition
activates 6MP & 6TG
Term
6MP & 6TG
MOA
Definition
purine analogs (guanine)
MOA: inhibit GMP(&) synth
Term
Drugs that cause myelosuppression (5)
Definition
Carboplatin
Purine Analog
Arthracyclines
Hydroxyurea
Topotecan
Term
fludarabine & cladiribine
MOA
ADR
Definition
purine analogs (adenine)
MOA: activated via tri-P -> incorp into DNA -> chain term
**like acyclovir
ADR: CD4+ bone marrow suppression (OI susceptible)
Term
DPD
Definition
enzyme that inactivates 5-FU
-genetic test
Term
capecitabine & 5-FU
MOA
Definition
capecitabine(PO) -> 5-FU -> fdUMP -> inhibit TS
*must give leukovorin(->MTHF cofactor) to stabilize interaction
Term
cytarabine & gemcitabine
Definition
cytidine analog -> triP -> DNA incorp -> chain term
Term
azacytidine & decitabine
Definition
cytidine analog;
triP -> DNA incorp -> inhibit DNA methyl transferase
"differentiating agents"
Term
hydroxyurea
moa, tox
Definition
inhibit ribonucleotide reductase
tox: myelosuppression
Term
vinca alkaloids
moa, resistance
Definition
MOA: bind open GTP site on B tubule to prevent elongation
resistance: Pgp, B tubule mutation, increased B tubules
Term
vinblastine
Definition
vinca alkaloid
Term
vinchristine
Definition
vinca alkaloid
Term
vinorelbine
Definition
vinca alkaloid
Term
paclitaxel
Definition
taxane
Term
docetaxel
Definition
taxane
Term
Nab-paclitaxel
Definition
taxane
albumin-bound nanoparticle increases solubility (thus decreased hypersensitivity) and efficacy
Term
ixabepilone
Definition
taxane-like
decreased resistance due to slightly diff binding site
Term
Taxanes
MOA, resistance
Definition
MOA: bind side B-tubule site to stabilize to decrease collapse
Resitance: Pgp, decreased penetration of drug, B tubule mutatoin, increased B tubules
Term
camptothecans
MOA & Phase
Definition
S Phase
MOA: inhibit TopoI after ss break but before religation
Term
topotecan
Definition
topo I inhibitor
Term
irinotecan
unique toxicity
metabolism
Definition
topo I inhibitor
tox: neutropenia, diarrhea
activated by carboxyl esterase -> detox by UGT1A1 -> enterohepatic recirculation -> de-gluc'd by bacteria -> can act in SMINT
Term
UGT-1A1
Definition
Detox SN38 (irinotecan active) by glucuronidation
**genetic test
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