Prokinetics speed the stomach up. Metoclopramide increases upper GI motility without increasing acid secretion — food (and the nausea) moves out faster. The trade-off: it crosses into the brain and blocks dopamine there too, which can trigger EPS and, with long-term use, irreversible tardive dyskinesia.
One receptor explains the whole drug — block dopamine in the gut and brain, and everything else follows.
⚙️ Mechanism: sensitizes the gut to acetylcholine
Increases motility of the upper GI tract without increasing secretions. By sensitizing GI smooth muscle to the effects of acetylcholine, it increases the tone and amplitude of gastric contractions — resulting in faster emptying of gastric contents into the small intestine. It also blocks dopamine receptors in the brain's vomiting center, giving it an antiemetic effect on top of the prokinetic one.
🧠 "Re-GLAN-ce forward." Prokinetic = PRO (forward) + KINETIC (movement) — Reglan pushes gastric contents forward into the small intestine instead of letting them sit or reflux back up.
💊 Drug Card
Field
Detail
Generic
Metoclopramide
Trade
Reglan
Use
GERD, diabetic gastroparesis, prevention of chemo- and postop-related N/V
Dose
10–15 mg PO; 10–20 mg IM/IV
🧠 "REGLAN = Re-GLANd the gut." One drug card, one job: get the stomach moving again.
✅ Indications — why it's ordered
GERD — speeds emptying so less sits around to reflux
Diabetic gastroparesis — delayed emptying from autonomic neuropathy
Chemo-induced N/V — blocks CTZ dopamine receptors
Immediate postoperative period — postop ileus / N&V
🧠 "GDC-P" — GERD, Diabetic gastroparesis, Chemo N/V, Postop. Four reasons, one prokinetic.
⚠️
WATCH FOR
STEP 2 · KNOW THE RISKS
Block dopamine in two places — one calms the vomiting center, the other can move on its own for the rest of the patient's life.
🚨 EPS → Tardive Dyskinesia — the never-forget adverse effect
Higher doses or prolonged administration can produce CNS symptoms: restlessness, drowsiness, dizziness, and extrapyramidal symptoms (EPS) — tremor, involuntary limb movements, muscle rigidity, facial grimacing, and depression.
Tardive dyskinesia — nonreversible, involuntary muscle spasms typically linked to conventional antipsychotics — is known to occur with long-term use (12 weeks or more) of metoclopramide. Report EPS immediately — do not wait to see if it resolves, because catching it early is what prevents progression to tardive dyskinesia.
🧠 "TRAP."Tremor · Rigidity · Abnormal movements · Parkinsonism-like — the drug that treats vomiting can look like Parkinson's disease.
❌ Contraindications
Hypersensitivity to the drug
GI obstruction, gastric perforation, or hemorrhage — never push a prokinetic against a blocked or torn gut
Pheochromocytoma
Parkinson's disease or a seizure disorder if also taking other drugs that cause EPS
🧠 "Don't push against a wall." If the gut is obstructed or perforated, forcing motility just adds pressure to a broken pipe.
🧠 Two dopamine pathways, one drug
🧠 One blockade, two outcomes. Wanted dopamine block = no vomiting. Unwanted dopamine block = EPS.
🔀 Interactions
With…
Effect
Cholinergic blockers / opioids
↓ effectiveness of metoclopramide
Cimetidine
↓ absorption of cimetidine
Digoxin
↓ absorption of digoxin
MAOIs
↑ risk of hypertensive episode
Levodopa
↓ effectiveness of both drugs
🧠 Reglan vs. Levodopa: a tug-of-war over dopamine. Reglan blocks the dopamine receptor; levodopa is trying to feed it dopamine. They cancel each other out.
⚠️ Caution
Diabetes and cardiovascular disease
Pregnancy and lactation — excreted in breast milk
🧠 NCLEX trap: rapid IV infusion can cause sudden restlessness/anxiety (akathisia) that gets mistaken for the patient's baseline anxiety — it's actually an EPS symptom.
🎓
TEACH
STEP 3 · SAFE ADMINISTRATION
Timing, rate, and what to tell them before they leave with a script.
✅ Nursing management ladder
1
🍽️ Give on an empty stomach
2
💧 IV: monitor infusion rate frequently — too rapid an infusion may induce cardiac arrhythmias
3
🥛 Chew tablets thoroughly, follow with a full glass of water or milk
4
📋 Track bowel movements — can cause constipation OR diarrhea
🚀 Prokinetic= speeds gastric emptying, not an acid drug
🧠 Dopamine blocker= EPS risk, same family as antipsychotics
🍽️ Empty stomach= how you give it
🚨 12+ weeks= tardive dyskinesia risk, report EPS now
🎯 Cover & check — 4 rapid-fire questions
Q1: Name one key clue that metoclopramide is a prokinetic, not an acid reducer?
It increases motility of the upper GI tract and increases the tone/amplitude of gastric contractions — it does not lower stomach acid.
Q2: Name one priority nursing action with IV metoclopramide.
Monitor the infusion rate frequently — too rapid an infusion may induce cardiac arrhythmias.
Q3: Name one teaching point about EPS.
Report any tremor, facial grimacing, rigidity, or involuntary movement immediately — don't wait, because long-term use (12+ weeks) can progress to irreversible tardive dyskinesia.
Q4: A patient with a known bowel obstruction is ordered metoclopramide. What do you do?
Hold the dose and notify the provider — GI obstruction, gastric perforation, or hemorrhage is a contraindication.