Reglan Side Effects
Generic name: metoclopramide
Medically reviewed by Drugs.com. Last updated on May 11, 2022.
Note: This document contains side effect information about metoclopramide. Some of the dosage forms listed on this page may not apply to the brand name Reglan.
For the Consumer
Applies to metoclopramide: oral solution, oral tablet, oral tablet disintegrating
Other dosage forms:
Oral route (Tablet)
Metoclopramide can cause tardive dyskinesia, a serious movement disorder that is often irreversible. The risk of developing tardive dyskinesia increases with duration of treatment and total cumulative dose. Discontinue metoclopramide in patients who develop signs or symptoms of tardive dyskinesia. There is no known treatment for tardive dyskinesia. In some patients, symptoms may lessen or resolve after metoclopramide is stopped. Avoid treatment with Reglan for longer than 12 weeks because of the increased risk of developing TD with longer-term use.
Oral route (Tablet, Disintegrating; Solution)
Metoclopramide treatment can cause tardive dyskinesia, a serious movement disorder that is often irreversible. Risk is increased with duration of treatment and total cumulative dose. Discontinue metoclopramide therapy in patients who develop signs or symptoms of tardive dyskinesia. There is no known treatment for tardive dyskinesia, although symptoms may lessen or resolve after metoclopramide discontinuation. Prolonged treatment with metoclopramide (greater than 12 weeks) should be avoided in all but rare cases where therapeutic benefit outweighs the risks.
Side effects requiring immediate medical attention
Along with its needed effects, metoclopramide (the active ingredient contained in Reglan) may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor immediately if any of the following side effects occur while taking metoclopramide:
Incidence not known
- clay colored stools
- dark urine
- difficulty with breathing
- difficulty with speaking or swallowing
- dizziness or fainting
- fast or irregular heartbeat
- general feeling of tiredness or weakness
- headache (severe or continuing)
- inability to move the eyes
- increase in blood pressure
- increased sweating
- itching, skin rash
- lip smacking or puckering
- loss of appetite
- loss of balance control
- loss of bladder control
- mask-like face
- muscle spasms of the face, neck, and back
- puffing of the cheeks
- rapid or worm-like movements of the tongue
- shuffling walk
- sore throat
- stiffness of the arms or legs
- stomach pain or tenderness
- swelling of the feet or lower legs
- tic-like or twitching movements
- trembling and shaking of the hands and fingers
- twisting movements of the body
- uncontrolled chewing movements
- uncontrolled movements of the arms and legs
- unusually pale skin
- weakness of the arms and legs
- yellow eyes or skin
Get emergency help immediately if any of the following symptoms of overdose occur while taking metoclopramide:
Symptoms of overdose
- drowsiness (severe)
Side effects not requiring immediate medical attention
Some side effects of metoclopramide may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects.
Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
- loss of strength or energy
- muscle pain or weakness
- unusual weak feeling
Incidence not known
- Breast tenderness and swelling
- changes in menstruation
- decreased interest in sexual intercourse
- inability to have or keep an erection
- increased flow of breast milk
- increased need to urinate
- loss in sexual ability, desire, drive, or performance
- mental depression
- passing urine more often
- skin rash
- trouble sleeping
- unusual dryness of the mouth
- unusual irritability
For Healthcare Professionals
Applies to metoclopramide: compounding powder, injectable solution, nasal spray, oral concentrate, oral syrup, oral tablet, oral tablet disintegrating
The incidence of side effects correlates with dose and duration of metoclopramide (the active ingredient contained in Reglan) therapy.[Ref]
Drowsiness, decreased level of consciousness, confusion, and hallucinations have higher incidences with higher doses.
Convulsive seizures have been reported, especially in patients with epilepsy; however, there is no obvious association with use of this drug.
Dystonic reactions typically presented as upper airway obstruction with stridor and dyspnea.
Parkinsonian symptoms may be related to usual/excessive doses and/or decreased renal function and includes tremor, rigidity, bradykinesia, and akinesia.[Ref]
Very common (10% or more): Drowsiness (up to 70%), acute dystonic reaction (up to 25%)
Common (1% to 10%): Akathisia, dizziness, extrapyramidal disorders, headache, parkinsonism, somnolence
Uncommon (0.1% to 1%): Depressed level of consciousness, dyskinesia, dystonia
Rare (0.01% to 0.1%): Bradykinesia, convulsion, dystonic reaction, tremor
Very rare (less than 0.01%): Neuroleptic malignant syndrome
Frequency not reported: Acute dyskinesia, acute dystonia/acute dystonic reaction, altered consciousness, autonomic instability, bulbar type of speech, choreoathetotic movements, cogwheel rigidity, convulsive seizures, extrapyramidal symptoms, facial grimacing, facial muscle spasm, fatal dystonic reaction, foot tapping, inability to sit still, involuntary movements of the extremities/face/jaw/mouth/tongue/trunk, mask-like facies, motor restlessness, opisthotonos, pacing, parkinsonian syndrome, rhythmic tongue protrusion, serotonin syndrome, syncope, tardive dyskinesia, tetanus-like reaction, unnatural position of head and shoulders[Ref]
Common (1% to 10%): Diarrhea, nausea, vomiting
Uncommon (0.1% to 1%): Bowel disturbances
Rare (0.01% to 0.1%): Supraglottic dystonia
Common (1% to 10%): Asthenia, fatigue, lassitude
Frequency not reported: Effects on the ability to drive/operate machinery, hyperpyrexia, hyperthemia, jitteriness[Ref]
Common (1% to 10%): Depression, restlessness
Uncommon (0.1% to 1%): Hallucination, insomnia
Rare (0.01% to 0.1%): Acute depression, confusional state
Common (1% to 10%): Hypotension
Uncommon (0.1% to 1%): Bradycardia
Very rare (less than 0.01%): Cardiac conduction abnormalities, heart block
Frequency not reported: Acute congestive heart failure, acute hypertension, atrial fibrillation, atrioventricular (AV) block, cardiac arrest, edema, electrocardiogram QT prolonged, fatal cardiorespiratory arrest, hypertension, palpitation, possible AV block, shock, sinus arrest, supraventricular tachycardia, tachycardia, Torsade de Pointes, transient facial/upper body flushing, transient increase in blood pressure, ventricular fibrillation, ventricular tachycardia[Ref]
Hypotension, bradycardia, shock, and other abnormalities or cardiac conduction occurred most frequently with IV formulations.
Cardiac arrest occurred shortly after IV administration, and may have been subsequent to bradycardia.
Sinus arrest and transient facial/upper body flushing occurred, particularly with IV administration. Flushing typically occurred without alterations in vital signs following high dose IVs.
Edema/fluid retention may be secondary to a transient increase in aldosterone levels.
Acute hypertension has occurred in patients with pheochromocytoma.
Hypertension has occurred in patients with/without pheochromocytoma.[Ref]
Uncommon (0.1% to 1%): Amenorrhea
Rare (0.01% to 0.1%): Galactorrhea
Uncommon (0.1% to 1%): Hyperprolactinemia
Frequency not reported: Endocrine disorders, gynecomastia, transient aldosterone elevation[Ref]
Amenorrhea, galactorrhea, and gynecomastia occurred secondary to hyperprolactinemia during prolonged treatment.[Ref]
Uncommon (0.1% to 1%): Hypersensitivity
Bronchospasm, wheezing, and dyspnea typically occurred in patients with a history of asthma.
Respiratory failure occurred secondary to dystonic reactions.[Ref]
Rare (0.01% to 0.1%): Dyspnea, laryngospasm, stridor, upper airway obstruction
Frequency not reported: Acute asthmatic symptoms, bronchospasm, laryngeal edema, respiratory failure, wheezing[Ref]
Rare (0.01% to 0.1%): Rigidity
Leukopenia, neutropenia, and agranulocytosis typically did not have a clear-cut relationship with this drug.
Methemoglobinemia and sulfhemoglobinemia occurred with high doses of this drug. Methemoglobinemia may be related to NADH cytochrome b5 reductase deficiency or overdose, particularly in neonates. Sulfhemoglobinemia usually occurred in adults with concomitant use of high doses of sulfur-releasing products.[Ref]
Rash and urticaria typically occurred in patients with a history of asthma.[Ref]
Frequency not reported: Extraocular muscle spasm, oculogyric crisis, visual disturbances[Ref]
More about Reglan (metoclopramide)
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- During pregnancy or Breastfeeding
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- Drug class: GI stimulants
- Drug Information
- Reglan (Advanced Reading)
- Reglan Intravenous (Advanced Reading)
- Reglan (Metoclopramide Injection Solution)
- Reglan (Metoclopramide Tablets)
Related treatment guides
1. "Product Information. Reglan (metoclopramide)." Wyeth-Ayerst Laboratories (2001):
2. Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0
3. Cerner Multum, Inc. "Australian Product Information." O 0
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
Some side effects may not be reported. You may report them to the FDA.