What Is Buspirone and How Does It Differ From Other Anxiety Medicines?

Buspirone (BuSpar) is a prescription medicine used to treat anxiety, most often ongoing generalized worry. It is not a benzodiazepine or an SSRI. It acts on serotonin and dopamine receptors, is taken daily, and usually takes weeks to help, so it is not a rescue medicine for panic attacks. This article explains what buspirone is used for, how it compares with SSRIs and benzodiazepines, its side effects and interactions, and when to get urgent help.

What Is Buspirone and What Is It Used For?

Buspirone is a prescription medicine approved in the US for anxiety. In practice it is most often prescribed for generalized anxiety, the pattern of persistent worry, tension and restlessness described by MedlinePlus (NIH) on anxiety. Treatment guidance for generalized anxiety often places SSRIs or SNRIs first, with buspirone considered as an alternative or an add-on when symptoms continue. Whether either choice fits you is a decision for you and your prescriber.

It belongs to a class sometimes called azapirones. That class is chemically unrelated to benzodiazepines (such as alprazolam, lorazepam or clonazepam) and to SSRIs (such as sertraline or escitalopram). That difference helps account for some of the ways buspirone feels different in day-to-day use.

How Buspirone Works

Buspirone is thought to act mainly as a partial agonist at serotonin 5-HT1A receptors. It also affects some dopamine receptors. The full mechanism behind its anti-anxiety effect is not completely understood, and several factors probably contribute.

Buspirone does not act on GABA receptors the way benzodiazepines do. That is why it is generally not sedating in the same way and does not produce the quick calm a person may notice after a benzodiazepine. It also does not work like an SSRI, which raises serotonin availability by blocking its reuptake.

Buspirone Compared With Other Anxiety Medicines

This table is a general comparison. Individual responses vary, and the right option depends on your symptoms, other conditions, other medicines and preferences.

Versus SSRIs

Treatment guidance for generalized anxiety disorder and panic disorder often lists SSRIs or SNRIs among the first-line medicines, and SSRIs can also treat depression. They can take weeks to work, which is covered in our article on how long SSRIs take to work for anxiety. Buspirone can be an alternative for people who do not tolerate SSRIs, for example because of sexual side effects, or an add-on when an SSRI has helped only partly. Buspirone is not generally considered a treatment for depression on its own.

Versus benzodiazepines

Benzodiazepines can calm acute anxiety quickly, but drowsiness, memory and coordination problems, falls in older adults, and physical dependence are recognized concerns. Buspirone has a different risk profile. Its tradeoff is speed: a person who expects relief from the first dose may feel it is not working, and a prescriber can explain what to expect and when to check in.

Versus hydroxyzine, beta blockers and others

Hydroxyzine is an antihistamine that can cause drowsiness and is sometimes used for short-term anxiety. Propranolol and other beta blockers may ease physical symptoms such as a racing heartbeat or shaking in situations like public speaking, but they do not treat worry itself. Each of these has its own cautions, so it is worth asking the prescriber why one was chosen over another.

Does Buspirone Help Panic Attacks?

Buspirone is not a rescue medicine. Because it is not fast acting, it is not designed to stop a panic attack that has already started. For panic disorder, which MedlinePlus (NIH) describes as repeated, unexpected panic attacks and fear of more of them, clinicians more often consider other approaches, including SSRIs or SNRIs and cognitive behavioral therapy. If you have panic attacks, tell your clinician so they can decide what fits.

What to Expect When Starting Buspirone

Buspirone is taken by mouth, usually in divided daily doses that the prescriber adjusts gradually. It is approved in the US for anxiety disorders. Some people notice changes gradually rather than on a particular day. Do not change the amount or timing yourself, and do not stop it or add other medicines without asking the prescriber or pharmacist. Ask your pharmacist what to do about a missed dose. Take it the same way each time, as the label or pharmacist directs, since food can change how much is absorbed.

Side effects reported with buspirone include dizziness, lightheadedness, nausea, headache, nervousness and sleep changes. Many people find these settle with time, but tell your prescriber if they persist or interfere with daily life. Be careful when driving or operating machinery until you know how the medicine affects you.

Interactions and Cautions That Matter

Serotonin syndrome

Because buspirone acts on serotonin, combining it with other serotonin-affecting medicines or supplements can, in some cases, contribute to serotonin syndrome. Examples include SSRIs, SNRIs and other antidepressants, triptan migraine medicines, tramadol and certain other pain medicines, St. John's wort and some street drugs. Clinicians sometimes combine buspirone with an SSRI on purpose, which adds a serotonin syndrome risk, so the combination should be prescribed and monitored. Serotonin syndrome is a medical emergency when severe: very high body temperature, confusion or agitation, muscle rigidity, seizures and a racing heartbeat are the pattern to watch for. Milder early signs can include restlessness, tremor, sweating, diarrhea and muscle twitching, and they can progress, so contact a clinician or pharmacist the same day and go to the emergency room if fever, confusion, stiff muscles or a racing heartbeat develops. Our article on serotonin syndrome covers the warning signs in more detail.

MAOIs and other drug interactions

Buspirone should not be taken with a monoamine oxidase inhibitor (MAOI), a class of antidepressants, or within 14 days of stopping one, according to buspirone prescribing information. This includes the antibiotic linezolid and the dye methylene blue, which can act as MAOIs. The concern is a sudden, dangerous rise in blood pressure and serotonin toxicity. Your prescriber and pharmacist decide on any switch, so tell them about any MAOI you have taken recently and ask your pharmacist to check the current label.

Several other medicines change buspirone levels through liver enzymes. According to buspirone prescribing information, strong inhibitors of the CYP3A4 enzyme, such as clarithromycin, itraconazole and ketoconazole, and large amounts of grapefruit juice can raise levels, which may increase side effects, while inducers such as rifampin and some seizure medicines can lower levels. Give your pharmacist a full list of prescriptions, over-the-counter products and supplements, including St. John's wort, so they can check for interactions before you start or add anything.

Alcohol and other sedating substances

Alcohol can add to dizziness and impaired judgment. Research on pharmacotherapy for anxiety together with alcohol use disorders, such as this review in PubMed Central (NIH), suggests that choosing a medicine for people with both conditions is complex. If you drink regularly, tell your prescriber so they can plan treatment safely.

Liver, kidney, pregnancy and age

People with significant liver or kidney disease may need different handling of buspirone, and the prescriber decides. If you are pregnant, planning pregnancy or breastfeeding, discuss it with your clinician before starting or stopping. Older adults can be more sensitive to dizziness and falls, so tell the prescriber about any balance problems.

Mood and safety

Mood can change during any treatment change, and anxiety and depression often occur together. Buspirone is often taken with an antidepressant, and antidepressants carry a boxed warning about suicidal thoughts in children, teens and young adults, so that warning may apply to the other medicine you take. Report new or worsening low mood or suicidal thoughts to your clinician. If you have thoughts of harming yourself without a plan or intent, call or text 988, the Suicide and Crisis Lifeline, now, which is available at any time, and contact your clinician the same day. If you are in immediate danger or have a plan or intent, call 911.

Buspirone in Specific Situations

Some research looks at buspirone in particular groups. A small trial of buspirone for anxiety in Parkinson's disease in PubMed Central (NIH) examined safety and tolerability, which is an earlier question than whether it works. A review of interventions for treating anxiety after stroke describes limited evidence for many treatments. In these settings, the decision is individual and belongs with a specialist who knows your other conditions and medicines.

Talking With Your Prescriber

These questions can help you and your clinician decide whether buspirone is appropriate:

• What symptoms do we expect it to help, and how will we know if it is working?
• How does it fit with my other medicines and supplements?
• Should I expect to take it daily, and what should I do about a missed dose?
• Which side effects should prompt me to call you?
• When should we reassess, and what would be the next step if it does not help?

Medicine is one part of anxiety care. Therapy, sleep, activity and treating other conditions that can look like anxiety all matter, and MedlinePlus (NIH) gives an overview of the options. If you are not sure whether your worry is a disorder, our article on normal stress versus an anxiety disorder is a good starting point.

If You Take Too Much

An overdose of buspirone, especially with alcohol or other sedating substances, can cause marked drowsiness, vomiting, dizziness, and fainting. If someone cannot be woken, has trouble breathing, or has taken a large amount, call 911. For advice about a possible accidental or extra dose without those signs, call Poison Control at 1-800-222-1222.

When to Seek Medical Care