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Pharmacology Gastrointestinal Drugs
Gastrointestinal Drugs
22
Agriculture
3rd Grade
05/07/2012

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Term
Mechanism of action of Acid secretion
Definition
H+/ATPase in the parietal cells stimulated by
Vagus Nerve --> Ach
Entero Chromaffin Like Cells --> Histamine(H2)
Gastrin --> Calcium


Carbonic anhydrase reaction:
H2CO3 ---> H+ and HCO-

As H+ is secreted in the stomach, HCO3- is absorbed into the plasma, causing a serum alkalosis.
Term
H2 Blockers
Definition
"-tidine"
Cimetidine
Ranitidine
Famotidine
Nizatidine

Reversible block of H2 Receptor on H+/ATPase

*Cimetidine causes anti-androgenic effects. Causes gynacomastia and decreased libido. Men don't like taking this drug...
inhibitor of P450
Term
Proton Pump Inhibitors (PPI)
Definition
"-prazoles"
Omeprazoles
Lansoprazole

Irreversibly blocks H+/ATPase pump.

Used in PUD, GERD, Gastritis and Zollinger Ellison Syndrome
Term
Bismuth, Sucralfate
Definition
Physically binds to ulcer base providing protection

Increases Ulcer Healing

Used in triple therapy in H.Pylori Infection:
Metronidazole
Amoxicillin
Bismuth
Term
Misoprostol
Definition
PGE1 analog. Increases production of gastric mucosal barrier.

Used for prevention of NSAID induced PUD.

Contraindicated in women because its also used as an ABORTIFACIENT
Term
Muscarinic Antagonists
Definition
Pirenzepine
Propantheline

Blocks M1 receptors on ECL cells
Blocks M3 receptors on Parietal cells
Term
Octreotide
Definition
Somatostatin Hormone analog. Inhibits all other hormones to stop body functions and causes vasoconstriction

Used for:
Esophageal Varices
Carcinoid Syndrome
Zollinger Ellison Syndrome
Term
Prokinetic/motility Agents
Definition
MOA: Must do either of the following
Inc Ach
Inc 5HT
Dec D2

Bethanechol (Cholinergic Agonist)
Neostigmine (Anticholinesterase)
Metoclopramide (Inc 5HT Dec D2)
Domperidone (Dec D2)
Cisapride (Inc 5HT)
Macrolides (stimulates smooth mm)

**Metoclopramide can cause seizures
Term
Drugs for Crohns Disease
Definition
5-ASA agents:
Mesalamine
Sulfasalazine

6-Mercaptopurine Analogs:
Azathioprine/mercaptopurine

Anti Dihydrofolate Reductase:
Methotrexate

Anti TNF agents:
Infliximab
Adalimumab

Corticosteroids
Term
Weight Loss Drugs
Definition
Orlistat
Alters fat metabolism by inhibiting pancreatic lipase. Side effects of steatorrhea, reduced absorption of fat soluble vitamins

Sibutramine
sympathomimetic serotonin and Norepi reuptake inhibitor
Contraindicated in CAD, CHF, arrythmia, SSRI/MAOIs
Term
Treatment for Wilsons Disease
Definition
Penicillamine

(Coppers made of pennies)
Term
Treatment for Hemochromatosis
Definition
deFERoxamine
Phlebotomy (blood letting)

Classic Triad of Hemochromotosis:
Diabetes, bronzing, micronodular cirrhosis

'FE' just like iron
Term
Drug Cocktail for patients with severe cirrhosis
Definition
Propranolol
Lactulose
Diuretics
Antibiotics
Vitamin K
Octreotide
Term
Medications used for Chronic Hepatitis B and C
Definition
Alpha-Interferon
Ribaviron

Glycoproteins from human leukocytes that block viral RNA and DNA synthesis. Induces ribonuclease that degrades viral mRNA
Term
Medication for Primary Biliary Cirrhosis
and Gall Stones
Definition
Ursodiol

Decreases liver synthesis of cholesterol. Decrease intestinal absorption of cholesterol.
Term
Drug to relieve biliary colic
Definition
Dicyclomine

Anticholinergic drug, relaxes smooth muscle and relieves symptoms of biliary colic
Term
Treatment for Gallstones with from undercooked fish
Definition
Praziquantel

Trematodes (flukes)
Clonorchis sinensis
Term
Statin MOA
Definition
Inhibits HMG-CoA reductase

Cholesterol comes from Acetyl Co-A
Term
Benefits of Omega 3
Definition
Heart benefits to help arrythmia
Nerve development in utero
Reduce inflammation in rheumatic diseases
Term
Treatment for Cystinuria
Definition
Acetazolamide
Term
Reyes Syndrome
Definition
Caused by ASPRIN usage in a child, associated with infection from VZV/influenza.

Causes childhood hepatoencephalopathy by decreasing B-oxidation in mitochondrial cells
Term
Mineral Compounds used to treat esophageal reflux
Definition
Aluminum hydroxide Al(OH)2
Magnesium hydroxide Mg(OH)3
Calcium carbonate CaCO3

Which one causes:
Constipation
Diarrhea
Rebound acid
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