Does buspirone (Buspar) cause dizziness when first started?

Does Buspirone Cause Dizziness When First Started?

Yes, buspirone commonly causes dizziness when first started, occurring in approximately 12% of patients compared to only 3% with placebo, making it one of the most frequent adverse effects during initial treatment. 1

Incidence and Clinical Significance

Dizziness is the most commonly reported central nervous system adverse effect of buspirone during initial treatment:

• Dizziness occurs in 12% of buspirone-treated patients versus 3% on placebo in controlled clinical trials, representing a 4-fold increased risk 1
• Dizziness is a primary reason for treatment discontinuation, accounting for part of the 3.4% of patients who stopped buspirone due to CNS disturbances 1
• The severity is typically rated as mild to moderate rather than severe 2

Time Course and Onset

• Median time to onset of adverse events with buspirone is 10 days (IQR: 16 days), suggesting dizziness typically emerges within the first 1-2 weeks of treatment 3
• Most adverse events, including dizziness, occur during the initial titration phase of treatment 1

Related Symptoms

Buspirone causes a cluster of related vestibular/CNS symptoms during initial treatment:

• Lightheadedness occurs in 3% of patients (versus <1% on placebo) 1
• Headache affects 6-7% of patients (versus 2-3% on placebo) 1, 2
• Nervousness occurs in 4-5% (versus 1% on placebo) 1, 2

Dose-Related Considerations

• The standard starting dose is 15 mg daily (either 7.5 mg twice daily or 5 mg three times daily), titrated up to 30-45 mg daily 4
• Twice-daily dosing (15 mg BID) showed a higher incidence of palpitations (5%) compared to three-times-daily dosing (1%), though dizziness rates were similar between regimens 4
• Lower doses may be better tolerated initially, as demonstrated in pediatric studies where 2.5 mg twice daily showed better tolerability than 5 mg twice daily 5

Clinical Management Approach

Counsel patients that dizziness is expected during the first 1-2 weeks but typically improves with continued use:

• Advise patients to avoid driving or operating machinery until they know how buspirone affects them 1
• Consider starting at lower doses (7.5 mg twice daily) and titrating slowly in patients at higher risk for falls or balance issues
• Monitor for orthostatic hypotension, as syncope and hypotension are infrequent but documented adverse effects 1

Important Safety Context

While dizziness is common and usually benign, be aware of more serious neurological adverse events that can present similarly:

• Rare cases of vertigo, ataxia, and incoordination have been reported in postmarketing surveillance 1
• Dizziness combined with other neurological symptoms (tremor, involuntary movements, slowed reaction time) may warrant evaluation for more serious adverse effects 1