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GI 2
| Pharmacologic Category | Generic | Brand | Classification | Indication | Key Side effects | US Boxed Warning | Other notes |
|---|---|---|---|---|---|---|---|
| Histamine (H2) antagonist | famotidine (PO, IV) | Pepcid, Zantac 360 | PO: OTC | GERD, erosive esophagitis, SUP | headache, constipation, diarrhea, mental status changes | n/a | n/a |
| Dopamine (D2) antagonist | metoclopramide (PO, IV) | Reglan | n/a | Gastroparesis, GERD, nausea, vomiting | drowsiness, dystonia, akathisia, EPS, QTc prolongation, diarrhea, hyperprolactinemia | may cause tardive dyskinesia, do not use >12 weeks | CI with GI obstruction, perforation, or hemorrhage |
| Selective serotonin (5-HT3) antagonist | ondansetron (PO, IV) | Zofran | n/a | Nausea, vomiting | headache, fatigue, constipation, QTc prolongation | n/a | n/a |
| Histamine (H1) antagonist | promethazine (PO, IM, IV, PR) | Phenergan | n/a | Motion sickness, nausea, vomiting | drowsiness, dry mouth, blurred vision, QTc prolongation, EPS | potential for fatal respiratory depression in patients < 2 years old; injection can cause peripheral extravasation (preferred parenteral route is IM) | n/a |
| Histamine (H1) antagonist | meclizine (PO) | Bonine | OTC | Motion sickness, vertigo | drowsiness, dry mouth, blurry vision | n/a | n/a |
| Antidiarrheal | diphenoxylate and atropine (PO) | Lomotil | CS-V | Diarrhea | nausea, confusion, drowsiness, dizziness, xerostomia, tachycardia, urinary retention | n/a | do not use in diarrhea associated with enterotoxin- producing bacteria or in children <6 years of age |
| Proton pump inhibitor (PPI) | dexlansoprazole (PO) | Dexilant | n/a | GERD, PUD, erosive esophagitis, SUP | headaches, abdominal pain, nausea, diarrhea, bone fracture, vitamin B12 deficiency, hypomagnesemia, increased risk of Clostridioides difficile associated diarrhea (CDAD) | n/a | n/a |
| Proton pump inhibitor (PPI) | esomeprazole (PO, IV) | Nexium | PO: OTC | GERD, PUD, erosive esophagitis, SUP | headaches, abdominal pain, nausea, diarrhea, bone fracture, vitamin B12 deficiency, hypomagnesemia, increased risk of Clostridioides difficile associated diarrhea (CDAD) | n/a | n/a |
| Proton pump inhibitor (PPI) | lansoprazole (PO) | Prevacid | OTC | GERD, PUD, erosive esophagitis, SUP | headaches, abdominal pain, nausea, diarrhea, bone fracture, vitamin B12 deficiency, hypomagnesemia, increased risk of Clostridioides difficile associated diarrhea (CDAD) | n/a | n/a |
| Proton pump inhibitor (PPI) | omeprazole (PO) | Prilosec | OTC | GERD, PUD, erosive esophagitis, SUP | headaches, abdominal pain, nausea, diarrhea, bone fracture, vitamin B12 deficiency, hypomagnesemia, increased risk of Clostridioides difficile associated diarrhea (CDAD) | n/a | n/a |
| Proton pump inhibitor (PPI) | pantoprazole (PO, IV) | Protonix | n/a | GERD, PUD, erosive esophagitis, SUP | headaches, abdominal pain, nausea, diarrhea, bone fracture, vitamin B12 deficiency, hypomagnesemia, increased risk of Clostridioides difficile associated diarrhea (CDAD) | n/a | n/a |
| Gastrointestinal protectant | sucralfate (PO) | Carafate | n/a | duodenal ulcers | constipation, bezoar formation | n/a | take on an empty stomach; many drug interactions due to reducing absorption of other drugs |