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Pharm - Gastro
Gastrointestinal Pharmacology from First Aid 2013
Question | Answer |
---|---|
H2 Blockers: Naming, MOA, Use, Tox | Nom: Cimetidine, "-idine" MOA: rev block histmaine receptors decrease H+ secretion by parietal cells Use: Peptic ulcer, gastritis, reflux Tox: CYP450 interactions, anti-androgenic |
PPI's: Naming, MOA, Use, Tox | Nom: Omeprazole, "-azole" MOA: irrev block H+/K+ ATP-ase at parietal cc Use: ucler, gastritis, reflux, ZES Tox: Risk of C.diff infxn, pneumonias, hip fractures and dec Mg2+ with long use |
Bismuth, sucralfate: MOA and Use | Creates a physical webbing-mesh to protect an ulcer and increases the mucous barrier. Use with ETEC and ulcer healing. |
Misoprostol: MOA, Use, Tox | MOA: PGE1 analog, inc mucous, dec acid Use: Prevent NSAID-induced ulcers also maintains PDA and ripens cervix Tox: Diarrhea and abortive agent |
What is Octreotide? How should you use it? What are its GI toxicities? | Somatostatin analog. Used for: Acromegaly, varices, VIP-oma, carcinoid Tox: Nausea, cramps, steatorrhea |
Name three mineral-based antacids. What side effects are common to all? | Mg hydroxide Al hydroxide Ca-carbonate All cause hypokalemia and poor absorption. |
Side effects of Mg hydroxide? | MG = "must go" to the bathroom! Diarrhea. |
Side effects of Al hydroxide? | Aluminum = "minimum" amount of feces -> constipation. Also, hypophosphatemia. |
Side effects of Calcium carbonate antacid? | Hypercalcemia. Can chelate and reduce the effictiveness of other drugs (e.g., tetracycline). |
Name some osmotic laxatives? How might they be misused? | Mg hydroxide, Mg citrate, Lactulose Draw out water via osmotic load. Abused by bulimics. |
In addition to functioning as a laxative, lactulose also treats what? | Hyperammonemia. It promotes NH4+ excretion. |
Infliximab: MOA, Use, Tox | MOA: monoclonal Ab to TNF-alpha Use: Crohn's, UC, RA Tox: infection, reactivated TB, oligospermia |
Sulfasalazine (5-ASA): MOA, Use, Tox | MOA: ASA(Aspirin) + sulfapyridine(antibact) Use: Ulcerative colitis Tox: malaise, nausea, sulfa tox, oligospermia |
Ondansetron: MOA, Use, Tox | MOA: 5-HT antagonist at area postrema Use: anti-emetic, e.g., for chemo Tox: headache, constipation |
Metoclopramide: MOA, Use, Tox | MOA: D2 receptor antagonist, inc LES tone Use: gastroparesis post surgery, anti-emetic Tox: Parkinsonism, C/I with obstruction |