Why Are Baclofen and Gabapentin Used for Chronic Hiccups?

If your doctor has prescribed baclofen or gabapentin for your chronic hiccups, you might be confused. Baclofen is commonly known as a muscle relaxer, and gabapentin is primarily a seizure and nerve pain medication. It can be jarring to be handed these prescriptions for a condition that is often dismissed as a minor nuisance, even though hiccups lasting for weeks can severely disrupt sleep, eating, and emotional well-being. However, prescribing these medications for persistent hiccups is a common clinical practice ^[1]. They are used to quiet the reflex responsible for your continuous hiccuping.

The Hiccup Reflex Network

To understand why these medications are used, it helps to understand what a hiccup actually is. A hiccup is an involuntary reflex controlled by a network of nerves ^[2]. This network involves:

• Sensory nerves (like the vagus and phrenic nerves) that send messages to your brain.
• A processing network centered in the brainstem, with broader connections in the central nervous system.
• Motor nerves that send signals back down to your diaphragm and vocal cords.

When this reflex is triggered, it causes a sudden, involuntary spasm of your diaphragm and the muscles between your ribs, immediately followed by the closure of your vocal cords (the glottis), creating the classic “hic” sound ^[2].

In a normal case of hiccups, this reflex stops on its own. However, in chronic hiccups (usually defined as lasting more than 48 hours, or “intractable” if lasting more than a month), this reflex network becomes abnormally activated ^[2].

How Baclofen and Gabapentin Might Help

Because every hiccup involves this neural reflex, medications that calm nerve activity are sometimes used to suppress the symptom. Baclofen and gabapentin are used off-label for chronic hiccups, meaning they are FDA-approved for other conditions but are sometimes utilized by doctors to help manage this symptom ^[1].

• Baclofen: Baclofen is a drug that inhibits certain excitatory signals in the brain ^[1]. It is proposed that it helps dampen the central processing part of the hiccup reflex, reducing the signals that cause the spasm ^[1].
• Gabapentin: Gabapentin is believed to affect how calcium channels in the nerves work, though its exact mechanism in treating hiccups is not fully established ^[3]. It is proposed that it might reduce the transmission of nerve impulses along the reflex arc ^[3].

Why Are These Options Chosen?

The medical research on treating chronic hiccups is limited. It primarily consists of small trials and case studies, meaning there is no single universally effective medication ^[1]. However, experts often consider baclofen and gabapentin to be reasonable options for some patients ^[1].

Historically, doctors have also used older medications like chlorpromazine to stop severe hiccups ^[1]. Chlorpromazine is actually FDA-approved for intractable hiccups, but it can cause side effects like low blood pressure and movement reactions ^[1]. Baclofen and gabapentin are sometimes preferred for certain patients, though they carry their own meaningful risks and are not automatically safer for everyone ^[1]. The choice of medication depends heavily on your age, kidney function, and other health conditions.

Important Safety Warnings

Because baclofen and gabapentin affect the central nervous system, they come with important safety considerations:

• Side Effects: Both can cause sleepiness, dizziness, weakness, confusion, and impaired balance.
• Dangerous Interactions: These effects can be dangerously intensified if combined with alcohol, opioids, sleep medicines, benzodiazepines, or other sedating drugs. Gabapentin also carries a risk of serious breathing problems in susceptible people.
• Precautions: Do not drive or operate machinery until you know how the medication affects you. If you have kidney disease, your doctor may need to adjust your dose.
• Stopping the Medication: Do not abruptly stop taking baclofen without your prescriber’s guidance, as sudden withdrawal can be serious. Gabapentin also typically needs to be tapered off slowly.

Seek immediate medical care if you experience severe sleepiness, an inability to wake up, slow or difficult breathing, or new neurologic symptoms like trouble speaking.

A Symptom Treatment While Searching for the Cause

It is important to remember that these medications only suppress the reflex; they do not cure the underlying cause. Persistent hiccups can be triggered by many different issues. Gastroesophageal reflux disease (GERD) is one common possibility ^[4], but triggers can also come from other digestive issues, chest problems, central nervous system disorders, metabolic imbalances, or even other medications ^[4][1].

While you may take these medications to find relief and reduce the burden of your symptoms ^[5], your healthcare team should continue investigating your history to find the root cause ^[4].

When to seek urgent evaluation for the hiccups themselves:
Do not wait for a medication trial to finish if you experience inability to eat or drink, dehydration, repeated vomiting, choking, trouble breathing, or severe chest or abdominal pain.