GI Drugs (Upper And Lower) Flashcards
Antacids indications
hyperacidity caused by Heartburn, GERD, acid indigestion, sour stomach, peptic ulcer
Aluminum antacids side effects
Constipation , intestinal impaction, anorexia, weakness, tremors and bone pain
Calcium antacids side effects
Metabolic alkalosis, hypercalcemia, vomiting, confusion, headache, rebound hyperacidity, renal calculi, and neurological impairment
Sodium bicarbonate antacids side effects
systemic Alkalosis and rebound hyperacidity
Antacids considerations
Impair absorption of some other drugs
Histamine H2 antagonists ex
-tidine: cimetidine, famotidine, nizatidine, ranitidine,
Histamine H2 antagonists indications
Heartburn, acid indigestion, sour stomach, GERD, gastric or duodenal ulcer, gastric hypercecretory conditions, stress related ulcers, acute GI bleeding in critically ill patients,
Proton pump inhibitors indications
GERD, erosive esophagitis, prevent bleeding in patients using antiplatelet drugs, gastric and duodenal ulcers associated with h. pylori infections, pathologic hypersecretory conditions
Proton pump inhibitors considerations
Work better than H2 Agonists
Proton pump inhibitors ex
-prazole: omeprazole, lansoprazole, pantoprazole, rabeprazole, esomeprazole, dexlansoprazole,
Proton pump inhibitors administration
Take before eating
Sucralfate MOA
Pepsin inhibitor/mucosal protective drug
Sulfacrate indication
Used in the short term treatment of duodenal ulcers, preferred in pregnant women with GERD symptoms and for treatment of stress ulcers
Misoprostol indications
Decreases risk of NSAID induced gastric ulcer in high risk patients (elderly or critically ill)
Misoprostol consideration
Women MUST be on birth control
Antiemetic side effect
Drowsiness
Metoclopramide indication
Delayed gastric emptying and emesis
Metoclopramide MOA
Increases mobility of upper GI tract without increasing secretion production, and inhibits stimulation of the vomiting center in the brain
aminosalicylate interactions
reduced absorption of Digoxin, methotrexate increases risk of immunosuppression, hypoglycemics decrease blood glucose level, warfarin increases risk of bleeding
Olsalazine pregnancy cat
C
Diphenoxylate indications
Decrease peristalsis, and decrease lower GI motility, usually combined with atropine, and also used for diarrhea, and is chemically related to opioids
Diphenoxylate consideration
Can have sedative and euphoric effect, but it is NOT an analgesic, reduced abuse potential
Diphenoxylate interaction
Atropine
Loperamide MOA
Acts on wall of bowel to slow motility
Loperamide restriction
Not during pregnancy
Loperamide side effect
Dizzy/headache, sedation/euphoria, anorexia, constipation
Antidiarrheals restrictions
Not for people with bacterial diarrhea (e. Coli, salmonella, shigella) kids under 2, jaundice, pseudomembranous colitis, abdominal pain of unknown origin
Antidiarrheals precautions
Severe hepatic impairment, pregnancy (cat C),
Antidiarrheals interactions
Antihistamines
Antiflatulents ex
Simethicone, charcoal
Antiflatulents side effects
None
Charcoal uses
Prevention of nonspecific pruritud associated with kidney dialysis, and as an antidote in poisoning
Laxatives indication
Prevent occasional constipation
Lactulose indications
Hypersmotic agent, ammonia toxicity
Magnesium considerations
Caution with renal impairment
Aminosalicylates ex
Sulfasalazine (MUST maintain high fluid intake)
Aminosalicylates indications
Ulcerative colitis, crohn disease, and other inflammatory diseases
Aminosalicylates side effects
Abdominal pain, nausea, diarrhea, headache, dizziness, weakness, fever, and low sperm count
Aminosalicylates interactions
Cardiotonics, hypoglycemics, anticoagulants
Stimulant laxatives ex
Senna, or bisacodyl, cascara sagrada, sennosides, bisacodyl
Stimulant laxatives side effects
Brown urine, dark Colon mucosa
Docusate indications
Stool softener (relieve constipation)
Sucralfate indication
Protect coating for stomach lining
Gastric stasis
Failure of the body to remove stomach contents normally
Gastroesophageal reflux disease (GERD)
Reflux or backup of gastric acid contentos into the esophagus
Hydrochloric acid
Stomach acid that aids in digestion
Hypersecretory
Characterized by excessive secretion of a substance
Upper GI system includes
Mouth, esophagus and stomach
Proton pump inhibitors use
Treatment of helicobacter pylori infection in people with duodenal ulcers
Antacids MOA
Neutralize of reduce the acidity of the stomach and duodenal contents by increasing the pH of the stomach acid
Antacids ex
Aluminum, magaldrate, magnesium
Aluminum carbonate use
Hyperphosphatemia, or as an adjunct to a low phosphate diet to prevent formation of phosphate based urinary stones
Calcium use
Calcium deficiencies, such as menopausal osteoporosis
Magnesium uses
Magnesium deficiencies, magnesium depletion from malnutrition, restricted diet, or alcoholism
Magnesium antacids side effects
Severe diarrhea, dehydration, hypermagnesemia
Antacids contraindications
Severe abdominal pain of unknown cause, lactation
Sodium antacids contraindications
Cardiovascular problems, and people on sodium restricted diets
Calcium antacids contraindications
Renal calculi, hypercalcemia
Aluminum antacids precautions
Gastric outlet obstruction, or upper GI bleeding , decreased kidney function,
Antacids pregnancy cat
C, caution
Calcium antacids precautions
Respiratory insufficiency, renal impairment, cardiac disease
Magnesium antacids precautions
Decreased kidney function
Antacids interactions
Decreased absorption and decreased effect of digoxin, isoniazid, phenytoin, and chlorpromazine, decreased effectiveness of tetracycline, decrease anti inflammatory properties of corticosteroids, salicylates are excreted faster in the urine
Histamine H2 antagonists MOA
Inhibit the action of histamine at H2 receptor cells of the stomach, reducing the secretion of gastric acid, (selective only in stomach, so don’t cause the reactions of general body H2 receptors)
Histamine H2 antagonists side effects nature
Mild and very rare
Histamine H2 antagonists side effects
Dizziness, somnolence, headache, confusion, hallucinations, diarrhea, reversible impotence
Histamine H2 antagonists precautions
Renal or hepatic impairment, severely ill, elderly, debilitated patients, pregnancy (cat B), and lactation
Nizatidine pregnancy cat
C
Histamine H2 antagonists interactions
Antacids, and metoclopramide decrease absorption of H2 antagonists, carmustine decreases white blood cell count, opioid analgesics increase risk of respiratory depression, oral anticoagulants increase risk for bleeding, and increased serum digoxin levels
Proton pump inhibitors MOA
Suppress gastric acid secretions by inhibition of the hydrogen-potassium adenosine triphospatase (ATPase) enzyme system of the gastric parietal cells
Combination therapy for H. pylori in people with duodenal ulcers
One PPI + 2 anti-invectives, bismuth + 2 anti-invectives ,
Proton pump inhibitors side effects
Headache, nausea, diarrhea, abdominal pain
Proton pump inhibitors precautions
Elderly, hepatic impairment, prolonged treatment can reduce ability to absorb vitamin B12, causing anemia
Proton pump inhibitors contraindications
Pregnancy (cat B), lactation
Omeprazole pregnancy cat
C
Proton pump inhibitors menopausal women considerations
Increase in features in hip, wrist, and spine in people taking high PPI doses and undergoing osteoporosis treatment with biophosphonates
Proton pump inhibitors interactions
Sulfacrate decreases proton pump inhibitor absorption, decreased absorption of ketoconazole and ampicillin, oral anticoagulants increase risk of bleeding, increased absorption of digoxin, risk for toxic level of anti seizure drugs (benzodiazepines and phenytoin), biophosphonates increase risk of fracture
Omeprazole interactions
Clarithromycin risks an increase in plasma levels in both drugs
Cholinergic blocking drugs for GI disorders ex
Propantheline, and glycopyrrolate, these have been largely replaced by H2 antagonists
Sucralfate side effects
Constipation
Sucralfate interactions
Similar interactions to PPIs
Misoprostol MOA
Inhibits production of gastric acid and has mucosal protective properties
Misoprostol Sadie effects
Headache, nausea, diarrhea, abdominal pain
Misoprostol interactions
Antacids decrease misoprostol effects
GI stimulants uses
GERD, gastric stasis in diabetic people, people with nausea and vomiting associated with chemo, and in the immediate postoperative period
Metoclopramide side effects nature
Usually mild, but higher doses or prolonged administration can exacerbate them
Metoclopramide side effects
Restlessness, drowsiness, dizziness, extrapyramidal effects (tremor, involuntary limb movements, muscle rigidity), facial grimacing and depression
GI stimulant contraindications
GI obstruction, gastric perforation or hemorrhage, or pheochromocytoma, Parkinson, seizure disorder, people taking drugs likely to cause extrapyramidal symptoms
GI stimulants precautions
Diabetes and cardiovascular disease, pregnancy (cat B), lactation
Metoclopramide pregnancy cat
B
GI stimulant interactions
Decreased absorption of cimetidine decreased absorption of digoxin, MAOIs increase risk of hypertensive episode
Metoclopramide interactions
Cholinergic blocking drugs and opioid analgesics decrease metoclopramide effectiveness, and decreased levels of levodopa and metoclopramide with levodopa
Antiemetic drugs uses
Inhibiting the CTZ and dopamine and acetylcholine
Motion sickness drugs ex
Dimenhydrinate, diphenhydramine, meclizine, scopolamine
5-HT3 receptor antagonists MOA
Target serotonin receptors both at the CTZ and peripherally at the nerve endings in the stomach (reduces non-GI adverse effects)
Antiemetic use
Before surgery to prevent vomiting during surgery, immediately after surgery when patient is recovering from anesthesia, while administering antineoplastics, during radiation therapy where the GI tract is the treatment field, and during pregnancy for hyperemesis, bacterial and viral infections and adverse drug reactions
Antiemetic contraindications
Severe CNS depression
5-HT3 receptors antagonists contraindications
Heart block, prolonged QT intervals, pregnancy, lactation, uncomplicated vomiting in young children
Prochlorperazine contraindications
Bone marrow depression, blood dyscrasias, Parkinson’s disease, or severe liver or cardiovascular disease
How to treat severe nausea and vomiting
NOT using only antiemetic drugs (cause should be investigated)
Severe nausea and vomiting being treated with antiemetics considerations
Antiemetics can hide signs of brain tumor/injury, appendicitis, intestinal obstruction, drug toxicity
Cholinergic blocking antiemetics precautions
Glaucoma, obstructive disease of the GI or genitourinary system, renal or hepatic dysfunction, and in older men with possible prostatic hypertrophy
Promethazine precautions
Hypertension, sleep apnea, epilepsy
5-HT3 receptor antagonists precautions
Cardiac conduction problems, or electrolyte imbalances
5-HT3 receptor antagonists uses
Hyperemesis
Antiemetics pregnancy cat
B
5-HT3 receptor antagonists pregnancy cat
B
Pregnancy cat C antiemetic drugs
Perphenazine, prochlorperazine, promethazine, scopolamine, chlorpromazine
Antiemetics interactions
CNS depressants increase risk of sedation, antihistamines increase anticholinergic side effects, antacids decrease absorption of antiemetics,
5-HT3 receptor antagonists interactions
Rifampin decreases 5-HT3 effectiveness
Prochlorperazine interactions
Lithium increases risk of extrapyramidal effects
Emetic use
Induced vomiting, used when people accidentally ingest a poison or drug overdose, but not all are treated with emetics
Emetics MOA
Local irritation of the stomach and by stimulation of the vomiting center in the medulla
Metoclopramide consideration
Tardive dyskinesia can occur with long term use (12+ weeks)
Antacids ex
Aluminum carbonate, aluminum hydroxide, calcium carbonate, magnesia, magnesium oxide, sodium bicarbonate
Misc acid reducers ex
Sucralfate, and misoprostol
GI stimulants ex
Metoclopramide
Antidopaminergic antiemetics
Chlorpromazine, perphenazine, prochlorperazine, promethazine
Anticholinergic antiemetics ex
Trimethobenzamide
5-HT3 receptor antagonists ex
Dolasetron, granisetron, odansetron, palonosetron
Misc antiemetics
Dronabinol, nabilone
Emetogenic
Causing vomiting
Chemoreceptor trigger zone (CTZ)
Group of nerve fibers located on the surface of the 4th ventricle of the brain, that, which stimulated, results in vomiting
Antiflatulents
Drugs that work against flats (gas)
Constipation
Hardened fecal matter that is difficult to pass
Diarrhea
Loose, watery stool
Inflammatory bowel disease
Inflammation of the bowel (crohn disease, and ulcerative colitis)
Obstipation
Watery stool leakage around a hard fecal impaction
Symptoms of crohn disease
Abdominal pain and distension, as the disease progresses, anorexia, diarrhea, weight loss, dehydration and nutritional deficiencies can occur
Drugs used to treat IBD
Antibiotics, corticosteroids, biologic agents, and aminosalicylates
Aminosalicylates MOA
Exert a topical anti-inflammatory effect in the bowel
Aminosalicylates contraindications
Allergy to salicylate-containing drugs, allergy to sulfonamides and sulfites, intestinal obstruction, kids younger than 2, pregnancy (cat B), and lactation
Natalizumab use
Parenteral, used for crohn disease and multiple sclerosis
Natalizumab side effects
Rare brain infection called leukoencephalopathy. Risk for this is greater if taking immunosuppressants or have been exposed to John cunning virus (JCV)
Generic name of lomotil
Diphenoxylate
Difenoxin use
Chemically related to opioid drugs, decrease intestinal peristalsis (used for diarrhea), are usually combined with atropine
Loperamide use
Chronic diarrhea associated with IBD
Crofelemer MOA
Blocks the secretion of chloride, which causes high water volume loss in the diarrhea associated with HIV/AIDS
Antidiarrheals side effects
Anorexia, vomiting, constipation, abdominal discomfort, pain and distension, dizzy, drowsy, headache, sedation, euphoria, rash
Loperamide pregnancy cat
B, but isn’t recommended for use during pregnancy and lactation
Crofelemer pregnancy cat
C, hasn’t been stifled for pregnancy, lactation, or pediatric use
Antidiarrheals interactions
Antihistamines, opioids, hypnotics, and sedatives increase risk of CNS depression, antihistamines and antidepressants increase anticholinergic side effects,
MAOIs increase risk of hypertensive crisis
Simétrico e MOA
Deforming action that dispersed and prevents the formation of gas pockets in the intestine
Charcoal MOA
Helps bind gas for expulsion
Antiflatulents uses
Relieve painful symptoms of excess gas in the digestive tract that may be caused by postoperative gaseous distention and air swallowing, dyspepsia, peptic ulcer, IBS or diverticulosis
Charcoal pregnancy cat
C
Simethicone precautions
Pregnancy (cat not known, but may be safe)
Charcoal interactions
Decrease in efedtcveness of other drugs because charcoal adsorbs them, and can adsorb drugs in the GI tract
Bulk producing laxatives MOA
Add bulk and water to the contents of the intestines, not digested by the body, which stimulates peristalsis, moves the products of digestion through the intestine and encourages evacuation of the stool
Bulk producing laxatives ex
Psyllium, and polycarbophil, and methylcellulose
Stool softeners MOA
Promote water retention in the fecal mass and soften the stool
Stool softener ex
Docusate
Emollient laxatives ex
Mineral oil
Emollient laxatives MOA
Lubricate the intestinal and soften stool
Hypersmolar laxatives MOA
Dehydrated local tissues, which causes irritation and increased peristalsis
Hypersmolar laxatives ex
Glycerin, lactulose, lubiprostone
Stimulant laxatives MOA
Increase peristalsis by direct action on the intestine
Saline laxatives MOA
Attract water into the intestine, increasing pressure, which is followed by an increase in peristalsis
Saline laxatives ex
Magnesium
Stimulant laxatives use
Evacuate colon for rectal and bowel examinations
Emollient laxatives use
Evacuate colon for rectal and bowel examinations
Saline laxatives use
Evacuate the colon for rectal and bowel examinations
Stool softeners use
Prevention of strain during defecation (after anorectal surgery or myocardial infarction)
Mineral oil use
Prevention of strain during defecation (after anorectal surgery or myocardial infarction)
Psyllium use
IBS and diverticular disease
Polycarbophil use
IBS and diverticular disease
Hypersmotic agents use
Reduction of blood ammonia levels in hepatic encephalopathy
Laxatives side effects
Diarrhea, loss of water and electrolytes, abdominal pain, nausea, vomiting, perianal irritation, fainting, bloating, flatulence, cramps, and weakness
Prolonged use of laxatives can result in
Serious electrolyte imbalances, or dependance on a laxative to have a bowel movement
Bulk forming laxatives side effects
Obstruction of the esophagus, stomach, small intestine, and colon when these are administered without good fluid intake or in people with intestinal stenosis
Mineral oil considerations
The very young, very old, and debilitated are at the highest risk for the aspiration of mineral oil into lungs, which can cause a lipid pneumonitis
Laxatives contraindications
Persistent abdominal pain, nausea, vomiting of unknown cause, signs of acute appendicitis, fecal impaction, intestinal obstruction, or acute hepatitis, or sensitive to tartrazine
Magnesium precautions
Renal impairment
Laxatives precaution
Rectal bleeding, pregnancy, lactation
Pregnancy cat C laxatives
Cascara sagrada, docusate, glycerin, phenophthalein, magnesium, senna
Mineral oil interactions
Can impair the absorption of fat soluble vitamins (
A, D, E, K), and surfactants can increase mineral oil absorption,
Laxatives interactions
Can reduce absorption of other drugs in the GI tract by combining with them chemically or hastening their passage through the intestinal tract
Bisacodyl tablets interactions
Milk, antacids, histamine H2 antagonists and PPIs shouldn’t be administered 1-2 hours before bisacodyl tablets
Orlistat MOA
Inhibits lipase, which can result in loose stools and increased flatulence
Orlistat use
Obesity management
Orlistat side effects nature
Side effects usually diminish by the 4th week, but can come back when a meal high in fat is eaten
Orlistat side effects
Loose stools, increased flatulence, fecal urgency, incontinence with fat or oily stools
Orlistat contraindications
Gallstones
Charcoal interactions considerations
Since charcoal can absorb other drugs, it shouldn’t be given 2 hours before or 1 hour after the administration of other drugs
Aminosalicylates ex
Balsalazide, mesalamine, olsalazine, sulfasalazine
Biológicas for bowel disorders ex
Adalimumab, certolizumab, infliximab, natalizumab,
Misc drugs for bowel disorders ex
Alosetron, alvimopan, eluxadoline, linaclotide, methylnaltrexone
Andidiarrheals ex
Bismuth, crofelemer, difenoxin with atropine, diphenoxylate with atropine, loperamide, tincture of opium
Antiflatulents ex
Charcoal, simethicone
Bulk producing laxatives ex
Methylcellulode, psyllium, polycarbophil