GI Flashcards
Indications for __________:
dyspepsia (heartburn), mild GERD and PUD
Antacids (Aluminum, Calcium, Sodium, and Magnesium- based)
MOA of __________:
*neutralize hydrochloric acid in the stomach, thereby increasing gastric pH > 4
*weak bases that react w/ HCl to form water and salt
*lasts 20-40 mins on empty stomach and 2-3 hrs on full stomach
Antacids (Aluminum, Calcium, Sodium, and Magnesium- based)
Safety Considerations/SE of ____________:
Warfarin (Coumadin)- may reduce absorption
Constipation
Aluminum-Based Antacids
Contraindications of __________:
Patients w/ renal insufficiency (high aluminum levels deposit in bone → osteomalacia)
Aluminum-Based Antacids
Special Note about _________:
Be sure to separate from other medications by 2 hours
Antacids
Example of Aluminum-Based Antacid
Aluminum Hydroxide- Amphogel
Contraindications of __________:
Patients w/ renal calculi
Calcium-Based Antacids
SE/Interactions of ________:
Constipation
Calcium-Based Antacids
Special Note about _________:
Used in calcium deficiency (w/ vit D)
Calcium-Based Antacids
Examples of Calcium-Based Antacids
Calcium Carbonate-Tums®, Rolaids®
Contraindications of __________:
Patients with cardiovascular disease (HTN)
Avoid in Pregnancy
Sodium-Based Antacids
SE/Interactions of ________:
May contribute to hypertension
Sodium-Based Antacids
Avoid ________ in patients with severe abdominal pain of unknown origin.
Antacids
SE of ________:
Diarrhea
Magnesium-Based Antacids
Contraindications of __________:
Patients w/ renal insufficiency (unable to excrete Mg → hypermagnesemia)
Magnesium-Based Antacids
All ________ increase or decrease absorption/SE of other drugs and increase absorption/SE of enteric coated drugs.
Antacids
Special Note about _________:
Used in Mg deficiency
Magnesium-Based Antacids
Example of Sodium-Based Antacids
Sodium Bicarbonate(Alka Seltzer®)
Example of Magnesium-Based Antacids
Magnesium Hydroxide(Milk of Magnesia®)
Do not take ______ with Iron or PNV
Antacids
H2RA (Histamine Receptor Agonists) Examples
cimetidine (Tagamet)
ranitidine (Zantac)
famotidine (Pepcid)
Indications for __________:
Heartburn
Prevents gastric/duodenal ulcers after one has healed
GERD after PPI therapy
H2RA (Histamine Receptor Agonists)
MOA of _________:
Inhibit acid secretion by gastric parietal cells by blocking H2 receptors
-Certain drugs in this class may affect gastric emptying and lower esophageal sphincter pressure also
H2RA (Histamine Receptor Agonists)
Safety Consideration for __________:
metabolized by CYP450 enzyme system in liver → increased concentration of other drugs metabolized by CYP450
Caution in patients w/ renal impairment (CNS adverse reactions)
Caution in older adults
H2RA (Histamine Receptor Agonists)
Contraindications of __________:
Patients w/ liver disease (can cause hepatitis)
Ranitidine (Zantac)
SE of \_\_\_\_\_\_\_\_\_: Drowsiness Dizziness GI upset Hematologic changes
H2RA (Histamine Receptor Agonists)
SE of _________:
Gynecomastia
Impotence in men
Cimetidine (Tagamet)
Of the H2RA (Histamine Receptor Agonists), __________ has most drug interactions and adverse effects and __________ has the fewest.
Cimetidine (Tagamet)- most
Famotidine (Pepcid)- fewest
H2RA (Histamine Receptor Agonists) are Pregnancy Category ___
B
H2RA (Histamine Receptor Agonists) that are safe in children
Ranitidine (Zantac)
Famotidine (Pepcid)
Special Note about _______:
Look out for GI bleeds!
H2RA (Histamine Receptor Agonists)
Indications for __________:
gastric conditions characterized by hyperacidity like erosive gastritis, GERD, Zollinger-Ellison syndrome
***part of a multidrug regimen for PUD caused by H. pylori
Proton Pump Inhibitors (PPI)
MOA of ________:
Suppress gastric acid secretion (antisecretory) by inhibiting Hydrogen/Potassium pump
Proton Pump Inhibitors (PPI)
SE of \_\_\_\_\_\_\_\_\_\_: Achlorhydria (absence of hydrochloric acid in the stomach) Dizziness Drowsiness GI upset
Proton Pump Inhibitors (PPI)
Safety Consideration for __________:
Metabolized by CYP450 → interaction w/ other drugs metabolized by CYP450
Decreased absorption of meds that need acidic environment to be absorbed
Caution in patients w/ hepatic dysfunction (metabolized in liver)
Caution in the elderly (excreted by kidneys)
Caution with use of clopidogrel (Plavix)
Long-term use:
Nutritional deficiencies (iron, vit B12, and Ca need acid to be absorbed)
Osteoporosis
Increased risk for infection including C diff and pneumonia (impaired defense against microbes)
Gastric cancer risk (hyperplasia of cells)
Proton Pump Inhibitors (PPI)
Contraindications of __________:
Clopidogrel (Plavix) → decreased effectiveness of clopidogrel → increased clot formation because both drugs use CYP2C19
omeprazole and esomeprazole (PPIs)
PPIs except omeprazole are Pregnancy Category ___
B
Omeprazole is Pregnancy Category ___
C
Special Notes about __________:
No adverse effects in breastfed infants
FDA approved in 1+ yo patients
Increased monitoring of INR for patients on warfarin
Be on the lookout for signs of GI bleed!!
Proton Pump Inhibitors (PPI)
Indication for __________:
prevention of peptic ulcers (chronic NSAID use)
Prostaglandin Analogs
Misoprostol (Cytotec)
MOA of _________:
inhibits gastric section and encourages mucus production by binding to prostaglandin E receptors
Prostaglandin Analogs
Misoprostol (Cytotec)
Safety Considerations/SE of __________:
Caution in patients w/ renal impairment which doubles the half-life
GI upset
Increased diarrhea risk w/ magnesium based antacids
Prostaglandin Analogs
Misoprostol (Cytotec)
Contraindications of _________:
Pregnancy (uterine contractions)
Pregnancy Category X
Prostaglandin Analogs
Misoprostol (Cytotec)
Examples of Stimulant Laxatives
Senna
Bisacodyl
Castor Oil
Cascara sagrada
MOA of ____________:
Stimulates myenteric plexus and acts on intestinal mucosa
Stimulate release of prostaglandins and increase in cAMP → secretion of electrolytes → stimulation of peristalsis
Stimulant Laxatives
Contraindications of ___________:
Castor oil in pregnancy (contractions)
Stimulant Laxatives
Safety Considerations of _________:
Caution for patients w/ severe CVD (bisacodyl)
Caution for patients w/ ETOH intolerance (cascara has ETOH in it)
Stimulant Laxatives
these drugs are good for constipation caused by reduced mobility, constipating drugs, and IBS because they work quickly and should be used for short-term only
Stimulant Laxatives
__________ is a Pregnancy Category C because it can cause diarrhea in infant if breastfeeding
Cascara sagrada
Bisacodyl is Pregnancy Category ____
B
Examples of Osmotic Laxatives
magnesium hydroxide
magnesium citrate
polyethylene glycol
MOA of _________:
draws water into intestines to increase pressure (hypertonic salt-based solutions)
Osmotic Laxatives
Contraindications of ALL ___________:
Patient w/ nausea/vomiting, undiagnosed abdominal pain, or suspected bowel obstruction
Laxatives
Contraindications of ___________:
Patients with:
Renal insufficiency (unable to excrete magnesium)
Hypermagnesemia
Hypercalcemia
Heart block
Children < 4 yo (can cause electrolyte disturbance)
Osmotic Laxatives
SE of ALL \_\_\_\_\_\_\_\_\_: Cramping Flatulence Bloating Perianal irritation
Laxatives
Examples of Bulk-Producing Laxatives
psyllium
methylcellulose
MOA of _______:
Similar to increasing fiber in diet because drug is made of polysaccharides and cellulose
**When combined w/ water they expand and increase peristalsis
Bulk-Producing Laxatives
Safety Considerations of _________:
Caution in patients w/ narrow esophageal or intestinal lumen
Bulk-Producing Laxatives
Special Notes about _________:
Good for long-term use w/ simple chronic constipation. Work slower but fewer adverse effects
Safe in pregnancy
Bulk-Producing Laxatives
Example of Lubricant Laxative
mineral oil
MOA of ________:
Prevents colonic absorption of fecal water which softens stool and lubricates the intestine to allow stool to flow more easily
Lubricant Laxatives
Safety Considerations of _________:
Decreases absorption of fat soluble vitamins (ADEK)
Potential for aspiration in children <4 yo if given orally
Caution with:
Elderly
Patients w/ dysphagia → lipid pneumonia
Pregnancy (due to decrease in fat soluble vitamins)
Newborns (causes issues)
Lubricant Laxatives
Special Notes about _________:
Good for fecal impactions
Lubricant Laxatives
Examples of Surfactants Laxatives
docusate sodium
docusate calcium
docusate potassium
MOA of ________:
facilitate mixture of fat and water in the stool causing an emollient effect
Surfactants Laxatives
Type of laxative that can be used in infants through older adults and is safe in pregnancy
Surfactants Laxatives
Type of laxative that is good for dry, hard stools, when straining should be avoided, and when passing stool is painful
Surfactants Laxatives
Examples of Hyperosmolar Laxatives
glycerin
lactulose
MOA of _________:
glycerin irritates the intestines and draws water into the intestine bringing more liquid into the stool
Hyperosmolar Laxatives
Safety Considerations of _________:
caution in patients with:
Volume depletion
DM (lactulose can cause hyperglycemia)
Hyperosmolar Laxatives
Type of laxative that is good for fecal impaction for patients w/ neurogenic bowel and chronic constipation in older adults
Hyperosmolar Laxatives
Hyperosmolar Laxatives:
glycerin pregnancy category __
lactulose pregnancy category __
C
B
Example of Absorbent Preparation Antidiarrheal
bismuth subsalicylate (Pepto Bismol) kaolin pectin
MOA of ___________:
antisecretory with some antimicrobial effects
Absorbent Preparation Antidiarrheal
Contraindications of ____________:
Salicylate in children
Patients w/ aspirin hypersensitivity
Absorbent Preparation Antidiarrheal bismuth subsalicylate (Pepto Bismol)
Safety Considerations of _________:
Increased risk for toxicity w/ aspirin use
Absorbent Preparation Antidiarrheal bismuth subsalicylate (Pepto Bismol)
Absorbent Preparation Antidiarrheals are all Pregnancy Category ___ except kaolin pectin which is a ___.
C…B
Example of Opiate Antidiarrheal
loperamide (Imodium)
MOA of _________:
binds to opiate receptors in intestinal wall → decreased motility
Opiate Antidiarrheal