Buspirone (BuSpar) for Anxiety: Uses, Dosage, Side Effects, and What to Expect
Buspirone is a non-addictive anti-anxiety medication FDA-approved for anxiety disorders, and it’s most often used for generalized anxiety disorder (GAD). It isn’t a benzodiazepine, it isn’t a controlled substance, and it rarely causes sedation, weight gain, or sexual side effects. The trade-off is time: buspirone has to be taken every day, usually twice daily, and it takes a few weeks to work. It won’t stop a panic attack in the moment.
The original brand, BuSpar, is no longer sold in the U.S., but generic buspirone is widely available and inexpensive. People still search for it by the BuSpar name, so you’ll see both here.
Azapirone anxiolytic (serotonin 5-HT1A partial agonist)
20–30 mg/day, split into 2 doses
1–2 weeks to start; 4–6 weeks for full effect
No. Not habit-forming
What Is Buspirone Used For?
- Anxiety disorders, especially generalized anxiety disorder. This is its FDA-approved use (anxiety treatment).
- Adding to an SSRI or SNRI when anxiety or depression has only partly improved
- Offsetting SSRI sexual side effects, off-label
- Anxiety in people who should avoid habit-forming medicines, such as those with a history of substance use
Buspirone is less useful for panic disorder, social anxiety, PTSD, and OCD on its own. SSRIs and SNRIs have stronger evidence for those.
How Does Buspirone Work?
Buspirone partially activates serotonin 5-HT1A receptors, which are involved in regulating anxiety, and has smaller effects on dopamine receptors. Unlike benzodiazepines, it doesn’t act on GABA receptors, which is why it doesn’t cause the same sedation, muscle relaxation, or dependence. The brain adjusts gradually, so the calming effect builds over weeks.
Buspirone Dosage
| Step | Dose |
|---|---|
| Starting | 7.5 mg twice daily (15 mg/day) |
| Adjusting | Increase by 5 mg/day every 2–3 days as needed |
| Usual range | 20–30 mg/day in divided doses |
| Maximum | 60 mg/day |
Source: Buspirone FDA prescribing information.
- Take it every day, not as needed. Buspirone doesn’t work in the moment.
- Be consistent with food. Food increases how much buspirone you absorb, so take it either always with food or always without.
- It leaves the body quickly (half-life about 2 to 3 hours), which is why it’s usually split into two or three doses a day.
- Scored “dividose” tablets split easily into thirds or halves, which makes small dose steps simple.
How Long Does Buspirone Take to Work?
This is the most common question, and the answer surprises people who expect a quick effect. Most people notice some improvement after 1 to 2 weeks of steady daily use, with fuller benefit over about 4 to 6 weeks. If you’ve previously taken a benzodiazepine, buspirone will feel much subtler. That’s normal and doesn’t mean it isn’t working.
Give it an adequate trial at an effective dose before deciding it hasn’t helped, and talk with your prescriber rather than stopping on your own.
Buspirone Side Effects
| Side effect | Buspirone | Placebo |
|---|---|---|
| Dizziness | 12% | 3% |
| Drowsiness | 10% | 9% |
| Nausea | 8% | 5% |
| Headache | 6% | 3% |
| Nervousness | 5% | 1% |
Source: Buspirone FDA prescribing information.
Dizziness often shows up 30 to 60 minutes after a dose and tends to fade over the first couple of weeks. Taking doses with food (consistently) or splitting into smaller doses can help. Some people also notice lightheadedness, restlessness, or vivid dreams.
What it usually doesn’t cause: significant sedation, memory problems, weight gain, or sexual side effects.
Who Should Be Careful With Buspirone
- Do not combine with an MAOI or within 14 days of one, including linezolid or IV methylene blue
- Allergy to buspirone
- Serious liver or kidney disease, which can raise buspirone levels
- Pregnancy or breastfeeding, to be discussed with your prescriber
Interactions
- Grapefruit juice. Large amounts can sharply raise buspirone levels. Avoid it.
- Medicines that block CYP3A4, such as diltiazem, verapamil, erythromycin, itraconazole, ketoconazole, and ritonavir, raise buspirone levels; a lower dose may be needed.
- Medicines that speed up CYP3A4, such as rifampin, carbamazepine, and phenytoin, can lower levels and reduce its effect.
- Other serotonergic drugs, such as SSRIs, SNRIs, triptans, and tramadol, add a small risk of serotonin syndrome. Buspirone is often combined with SSRIs safely, but your prescriber should know everything you take.
Alcohol: best avoided. It can worsen anxiety and add to dizziness.
Driving: buspirone is less sedating than most anti-anxiety medicines, but don’t drive until you know how it affects you.
Stopping: buspirone doesn’t cause physical dependence, but talk with your prescriber before stopping so your anxiety plan stays on track.
Buspirone vs. Other Anxiety Medications
| Medication | Speed | Habit-forming? | Best fit |
|---|---|---|---|
| Buspirone | Weeks | No | Ongoing worry (GAD); add-on to SSRIs |
| SSRIs / SNRIs (escitalopram, sertraline, venlafaxine) | Weeks | No | First-line for GAD, panic, social anxiety, depression |
| Hydroxyzine | Within an hour | No | As-needed relief; sedating |
| Propranolol | 30–60 minutes | No | Physical symptoms of performance anxiety |
| Benzodiazepines (Xanax, Ativan) | Fast | Yes (controlled) | Short-term use only; telehealth restrictions |
Buspirone vs. Xanax: Xanax works within minutes but is sedating and habit-forming. Buspirone takes weeks but carries no dependence risk and keeps you clear-headed. They serve different purposes, and buspirone isn’t a substitute in a moment of panic.
Buspirone vs. SSRIs: SSRIs and SNRIs have broader evidence across anxiety disorders and treat co-occurring depression. Buspirone is a good option when SSRIs aren’t tolerated, or as an add-on.
How We Approach Buspirone at Samz Mental Health
- Clarify the type of anxiety, since buspirone fits generalized worry better than panic or social anxiety
- Review your other medications, including CYP3A4 interactions and other serotonergic drugs
- Set realistic expectations about timing so you don’t give up too early
- Track progress with the GAD-7 and adjust through ongoing medication management
Can You Get Buspirone Prescribed Online?
Yes. Buspirone isn’t a controlled substance, so a licensed prescriber can prescribe it after a telehealth evaluation when appropriate. Samz Mental Health offers video visits for adults physically located in Texas, New York, Florida, Colorado, Washington, Maryland, New Hampshire, New Mexico, and Iowa.
In-network with Aetna, Cigna, UnitedHealthcare, Optum, and Carelon Behavioral Health. See insurance details. Need to be seen soon? We offer same-day psychiatrist appointments.
Frequently Asked Questions About Buspirone
What is buspirone used for?
It’s FDA-approved for anxiety disorders, mainly studied in generalized anxiety disorder, and is sometimes added to SSRIs.
How long does buspirone take to work?
Usually 1 to 2 weeks to notice a change, and 4 to 6 weeks for full effect. It doesn’t work as needed.
What is the usual buspirone dose?
Typically 7.5 mg twice daily to start, with most people taking 20 to 30 mg a day. The maximum is 60 mg a day.
Is buspirone addictive?
No. It isn’t a controlled substance and doesn’t cause dependence.
What are the most common side effects of buspirone?
Dizziness, nausea, headache, and nervousness, which often ease after the first couple of weeks.
Can I drink grapefruit juice with buspirone?
Avoid large amounts; it can sharply raise buspirone levels.
Does buspirone cause weight gain or sexual side effects?
Rarely. It’s generally weight-neutral and sometimes used to offset SSRI sexual side effects.
Can I get buspirone prescribed online?
Yes, after a telehealth evaluation. Samz Mental Health sees patients by video in nine states.
Talk to a Provider About Anxiety Treatment
Book a video evaluation with a board-certified psychiatric nurse practitioner. Same-day appointments available. No referral needed.
References
- Buspirone hydrochloride prescribing information. Drugs.com professional label; also on DailyMed.
Medical disclaimer: This page is for education and is not a substitute for a personal medical evaluation. Don’t start, stop, or change any medication without talking to your prescriber. If you’re in crisis or thinking about harming yourself, call or text 988 (Suicide & Crisis Lifeline) or call 911.