Metoclopramide

Diabetic Gastroparesis

Metoclopramide is used to relieve symptoms caused by gastroparesis, a condition where the stomach takes too long to empty its contents. In people with diabetes, this can lead to several uncomfortable symptoms that metoclopramide helps manage, including:

• Nausea and vomiting
• Heartburn
• Loss of appetite
• Feeling full long after a meal or shortly after starting to eat

Gastroesophageal Reflux Disease (GERD)

This medication is used for the short-term treatment of GERD, specifically when symptoms like heartburn persist despite the use of other treatments. It is generally used for a period of 4 to 12 weeks to allow the esophagus time to heal and to reduce discomfort.

Nausea and Vomiting Prevention

Metoclopramide is frequently used in clinical settings to prevent or treat nausea and vomiting in specific situations, such as:

• Following surgery (postoperative nausea)
• During or after chemotherapy or radiation treatments

Medical and Diagnostic Procedures

Healthcare providers may use metoclopramide to assist with certain medical tests or procedures. It can help empty the stomach before surgery or help move barium through the digestive tract during X-ray examinations. It is also used to facilitate small bowel intubation, a procedure where a tube is passed into the small intestine.

Increasing Digestive Movement

Metoclopramide is a type of medication known as a prokinetic agent. It works by stimulating the muscles of the upper digestive tract, including the stomach and the beginning of the small intestine. This action increases the strength and frequency of muscular contractions, which helps the stomach empty its contents more quickly into the intestines.

Blocking Nausea Signals

In addition to its effects on the digestive system, metoclopramide acts on the central nervous system. It works as a dopamine-receptor antagonist, meaning it blocks dopamine receptors in a specific part of the brain that triggers nausea and vomiting. By blocking these receptors, the medication helps to:

• Prevent the sensation of nausea.
• Reduce the urge to vomit.
• Interrupt signals that cause stomach upset.

Relieving Symptoms

By combining these two actions, metoclopramide helps manage conditions where the stomach does not empty fast enough, such as diabetic gastroparesis. It also helps prevent stomach acid from backing up into the esophagus, which can reduce heartburn and allow sores in the food pipe to heal.

Common Side Effects

Many people using metoclopramide do not experience significant side effects. However, some common reactions may include:

• Drowsiness or extreme tiredness
• Restlessness or feeling jittery
• Dizziness or lightheadedness
• Headache
• Nausea, vomiting, or diarrhea
• Breast tenderness or swelling
• Changes in menstrual periods

Serious Side Effects

Contact a healthcare provider immediately if you experience any of the following serious symptoms:

• Uncontrolled muscle movements: Twitching, shaking, or repetitive movements of the face, tongue, arms, or legs (tardive dyskinesia).
• Parkinson-like symptoms: Muscle stiffness, body tremors, or difficulty moving and balancing.
• Mental health changes: New or worsening depression, anxiety, confusion, hallucinations, or thoughts of self-harm.
• Neuroleptic Malignant Syndrome: High fever, very stiff muscles, fast or irregular heartbeat, and heavy sweating.
• Fluid retention: Swelling of the hands, feet, or lower legs.
• Allergic reactions: Rash, hives, or swelling of the face, lips, or throat.
• Vision changes: Blurred vision or other changes in sight.
• Jaundice: Yellowing of the skin or the whites of the eyes.

Tardive Dyskinesia Boxed Warning

Metoclopramide can cause tardive dyskinesia, a serious and sometimes permanent movement disorder. Symptoms include involuntary movements of the tongue, face, mouth, or jaw, and sometimes the arms and legs. The risk increases with longer treatment duration and higher total doses. Because of this risk, treatment usually does not exceed 12 weeks.

Neuroleptic Malignant Syndrome

A rare but life-threatening condition called neuroleptic malignant syndrome (NMS) has been reported with metoclopramide use. Symptoms may include high fever, muscle stiffness, altered mental status, and irregular pulse or blood pressure.

Mental Health and Neurological Concerns

• Depression: This medication may cause or worsen depression and has been linked to suicidal thoughts or behaviors.
• Parkinson's Disease: Metoclopramide can worsen motor symptoms in people with Parkinson's disease.
• Seizures: The drug may increase the frequency or severity of seizures in people with epilepsy.

Other Medical Conditions

Metoclopramide is typically avoided in individuals with certain gastrointestinal issues, such as bleeding, blockages, or tears in the stomach or intestines. It is also avoided in people with pheochromocytoma (a type of adrenal gland tumor) because it may cause a dangerous increase in blood pressure.

Caution is advised for individuals with heart failure, kidney disease, or liver cirrhosis, as the medication may lead to fluid retention or require dosage adjustments.

Pregnancy

Research regarding the use of metoclopramide during pregnancy has not shown a definitive link to birth defects or other developmental issues. However, because clinical data is limited, healthcare providers typically only prescribe it when the benefits to the mother outweigh the potential risks to the fetus.

Breastfeeding

Metoclopramide passes into breast milk and may affect a nursing infant. While it is sometimes used to increase milk supply by raising prolactin levels, its safety for the infant is not fully confirmed. Important considerations include:

• The potential for the drug to cause side effects in the infant, such as digestive changes or drowsiness.
• The importance of the medication for the mother's health versus the risks of infant exposure.

If you are pregnant, planning to become pregnant, or breastfeeding, it is important to discuss the use of metoclopramide with your doctor to evaluate the risks and benefits.

Oral Forms

Metoclopramide is available in several oral preparations:

• Tablets: Standard tablets taken by mouth.
• Orally disintegrating tablets: These are placed on the tongue, where they dissolve before being swallowed.
• Oral solution: A liquid or syrup form of the medication.

Nasal Spray

Metoclopramide is available as a spray for administration through the nose.

Injectable Solution

This medication is also prepared as a solution for injection. It is typically administered by a healthcare provider into a muscle or a vein.

FDA Approval and Indications

Metoclopramide is approved by the FDA for the short-term treatment of gastroesophageal reflux disease (GERD) and symptoms of diabetic gastroparesis. It is also used to prevent nausea and vomiting caused by chemotherapy or surgery and to assist with certain medical procedures involving the stomach or intestines.

Boxed Warning

The FDA has issued a boxed warning for metoclopramide because it can cause tardive dyskinesia, a serious and potentially permanent movement disorder. Symptoms include involuntary movements of the face, tongue, or extremities. The risk is highest in older adults, especially women, and in people who take the drug for long periods or at high doses. Treatment should generally be limited to the shortest duration necessary, typically not exceeding 12 weeks.

Available Forms

Metoclopramide is available in several FDA-approved forms, including:

• Oral tablets and orally disintegrating tablets
• Oral solution
• Nasal spray
• Injection (intravenous or intramuscular)

Withdrawal Symptoms

If you have been taking metoclopramide for a long period, stopping the medication abruptly may cause withdrawal symptoms. These symptoms typically include:

• Dizziness
• Nervousness
• Headache

To avoid these effects, your healthcare provider may recommend gradually reducing your dose before stopping the medication entirely. Always consult with a doctor before making changes to how you take this medicine.