Baclofen is one of the most effective medications for persistent and intractable hiccups, with clinical studies showing resolution rates above 90% in some patient groups. While chlorpromazine remains the only drug with formal FDA approval for hiccups, baclofen has stronger clinical trial evidence behind it and is widely used when hiccups last more than 48 hours and don’t respond to home remedies.
How Baclofen Stops Hiccups
Hiccups are driven by a reflex arc: sensory nerves detect a trigger, the brain processes the signal, and motor nerves cause the diaphragm and chest muscles to spasm involuntarily. The two main chemical messengers involved in this loop are dopamine and GABA, a neurotransmitter that calms nerve activity.
Baclofen activates a specific type of GABA receptor in the brain and spinal cord. When these receptors are stimulated, dopamine release drops, which appears to interrupt the hiccup reflex at its central processing point. Baclofen also influences nerve centers that control the lower esophageal sphincter, the muscular valve between your esophagus and stomach. This may be why it works well for hiccups that have a gastrointestinal trigger.
What the Clinical Evidence Shows
Baclofen is one of only two hiccup medications that have been tested in randomized controlled trials, the gold standard for medical evidence. The other is metoclopramide, a drug more commonly used for nausea. A systematic review of all pharmacologic hiccup treatments found that while many drugs have been reported as helpful in case reports, baclofen and metoclopramide are the only ones with this level of formal study behind them.
In a trial of stroke patients with persistent hiccups lasting more than 48 hours, baclofen proved significantly more effective than placebo. A separate single-arm trial tested baclofen in 45 cancer patients whose hiccups were triggered by chemotherapy. All 45 patients responded to treatment: 41 were fully cured (91%) and the remaining 4 experienced meaningful relief. More than half of those patients saw improvement after just two doses, and about 13% responded after a single dose. Only 2 of the 45 patients (roughly 4%) had their hiccups return after stopping the medication.
In individual case reports, some patients have experienced relief within one to two hours of taking their first dose, with hiccups stopping completely by the second hour.
How Baclofen Compares to Other Options
Chlorpromazine, an antipsychotic, is the only FDA-approved treatment for hiccups. But “FDA-approved” in this case is somewhat misleading. The approval is decades old, and the supporting evidence is limited. A systematic review concluded there is currently little evidence to support using one hiccup medication over another. In practice, doctors choose based on the patient’s other health conditions, what’s causing the hiccups, and the side effect profile of each drug.
Other medications that have shown effectiveness in published reports include gabapentin, metoclopramide, haloperidol, and several others. Baclofen stands out because it has been studied more rigorously than most alternatives and tends to work quickly. Current medical references, including the 2024 edition of a major diagnostic and treatment textbook, list baclofen alongside chlorpromazine, gabapentin, and metoclopramide as treatment options.
Typical Dosing and How Quickly It Works
The standard approach is 10 mg taken by mouth three times daily. Some sources recommend dosing every six to eight hours. In the chemotherapy-related hiccup trial, patients took 10 mg three times a day for three days, which was enough to resolve hiccups in almost all cases. Relief often begins within hours of the first dose, though it can take a few doses for full effect. Most patients in clinical studies saw their hiccups stop within the first one to two days of treatment.
Side Effects to Expect
Baclofen works on the central nervous system, and its side effects reflect that. The most common ones at the doses used for hiccups include drowsiness, dizziness (especially when standing up quickly), confusion, headache, trouble sleeping, and general fatigue. These effects are typically mild at the low doses used for hiccup treatment and often improve as your body adjusts.
The more serious concern is for people with kidney problems. Baclofen is cleared almost entirely by the kidneys, with 70 to 80% of the drug eliminated through renal excretion. In people with reduced kidney function, the drug can accumulate to toxic levels even at low doses, sometimes within just two to three days of starting treatment. Older adults, people taking other sedating medications, and those who drink alcohol are also at higher risk for toxicity. If you have any degree of kidney impairment, your doctor will need to adjust the dose carefully or consider an alternative.
When Baclofen Is Typically Prescribed
Doctors generally reserve baclofen for hiccups that have lasted more than 48 hours (called “persistent” hiccups) or more than a month (“intractable” hiccups). Ordinary hiccups that last a few minutes or even a few hours almost never need medication. But when hiccups persist, they can disrupt sleep, make eating difficult, and significantly affect quality of life.
Baclofen has shown effectiveness across a range of underlying causes: stroke-related hiccups, chemotherapy-induced hiccups, hiccups associated with gastroesophageal problems, and cases where no clear cause can be identified. Because treatment selection depends on what’s driving the hiccups and what other health issues are present, the choice between baclofen and alternatives like gabapentin or metoclopramide is individualized. That said, baclofen’s rapid onset, strong trial data, and relatively mild side effect profile at typical doses make it one of the most commonly reached-for options in clinical practice.