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Buspar Side Effects Center
Pharmacy Editor: Eni Williams, PharmD, PhD
Buspar (buspirone) is a medication that belongs to the drug class, antianxiety agents. Buspar is available as a generic drug. Buspar is prescribed for the treatment of anxiety. Common side effects of Buspar include dizziness, nausea, headache, nervousness, lightheadedness, excitement, and insomnia.
Buspar usual adult starting dose is 10-30mg daily in 2-3 divided doses up to a maximum of 60mg a day. Common drug interactions of Buspar include monoamine oxidase (MAO) inhibitors (for example, isocarboxazid [Marplan]), trazodone (Desyrel), warfarin (Coumadin), erythromycin, itraconazole (Sporanox), nefazodone (Serzone) and rifampin. There are no adequate studies of Buspar in pregnant women and it is not known if Buspar is secreted in human breast milk. Use during pregnancy is not recommended unless the potential benefit outweighs the potential unknown risk to the fetus.
Our Buspar Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
What is Patient Information in Detail?
Easy-to-read and understand detailed drug information and pill images for the patient or caregiver from Cerner Multum.
Buspar in Detail - Patient Information: Side Effects
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have any of these serious side effects:
- feeling light-headed, fainting;
- fast or uneven heart rate;
- depressed mood, unusual thoughts or behavior; or
- lack of balance or coordination.
Less serious side effects may be more likely to occur, such as:
- drowsiness, dizziness, blurred vision;
- feeling restless;
- nausea, upset stomach;
- sleep problems (insomnia); or
- trouble concentrating.
This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect. You may report side effects to FDA at 1-800-FDA-1088.
Read the entire detailed patient monograph for Buspar (Buspirone) »
What is Patient Information Overview?
A concise overview of the drug for the patient or caregiver from First DataBank.
Buspar Overview - Patient Information: Side Effects
Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.
Rarely, patients taking buspirone may develop movement disorders such as shakiness (tremors), muscle stiffness, mask-like facial expression, jerky walking movements, or a condition known as tardive dyskinesia. In some cases, these conditions may be permanent. Tell your doctor immediately if you develop any unusual/uncontrolled movements (especially of the face, mouth, tongue, arms, or legs).
Seek immediate medical attention if any of these rare but serious side effects occur: easy bleeding/bruising, shortness of breath, chest pain, fast/irregular heartbeat.
A very serious allergic reaction to this drug is unlikely, but seek immediate medical attention if it occurs. Symptoms of a serious allergic reaction may include: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.
This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist .
In the US -
Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.
Read the entire patient information overview for Buspar (Buspirone)»
What is Prescribing information?
The FDA package insert formatted in easy-to-find categories for health professionals and clinicians.
Buspar FDA Prescribing Information: Side Effects
(See also PRECAUTIONS)
The more commonly observed untoward events associated with the use of BuSpar (buspirone) not seen at an equivalent incidence among placebo-treated patients include dizziness, nausea, headache, nervousness, lightheadedness, and excitement.
Associated with Discontinuation of Treatment
One guide to the relative clinical importance of adverse events associated with BuSpar (buspirone) is provided by the frequency with which they caused drug discontinuation during clinical testing. Approximately 10% of the 2200 anxious patients who participated in the BuSpar (buspirone) premarketing clinical efficacy trials in anxiety disorders lasting 3 to 4 weeks discontinued treatment due to an adverse event. The more common events causing discontinuation included: central nervous system disturbances (3.4%), primarily dizziness, insomnia, nervousness, drowsiness, and lightheaded feeling; gastrointestinal disturbances (1.2%), primarily nausea; and miscellaneous disturbances (1.1%), primarily headache and fatigue. In addition, 3.4% of patients had multiple complaints, none of which could be characterized as primary.
Incidence in Controlled Clinical Trials
The table that follows enumerates adverse events that occurred at a frequency of 1% or more among BuSpar (buspirone hydrochloride) patients who participated in 4-week, controlled trials comparing BuSpar (buspirone) with placebo. The frequencies were obtained from pooled data for 17 trials. The prescriber should be aware that these figures cannot be used to predict the incidence of side effects in the course of usual medical practice where patient characteristics and other factors differ from those which prevailed in the clinical trials. Similarly, the cited frequencies cannot be compared with figures obtained from other clinical investigations involving different treatments, uses, and investigators. Comparison of the cited figures, however, does provide the prescribing physician with some basis for estimating the relative contribution of drug and nondrug factors to the side-effect incidence rate in the population studied.
TREATMENT-EMERGENT ADVERSE EXPERIENCE INCIDENCE IN PLACEBO-CONTROLLED
CLINICAL TRIALS* (Percent of Patients Reporting)
|*Events reported by at least 1% of BuSpar (buspirone)
patients are included.
-Incidence less than 1%.
Other Events Observed During the Entire Premarketing Evaluation of BuSpar (buspirone)
During its premarketing assessment, BuSpar (buspirone) was evaluated in over 3500 subjects. This section reports event frequencies for adverse events occurring in approximately 3000 subjects from this group who took multiple doses of BuSpar (buspirone) in the dose range for which BuSpar (buspirone) is being recommended (ie, the modal daily dose of BuSpar (buspirone) fell between 10 mg and 30 mg for 70% of the patients studied) and for whom safety data were systematically collected. The conditions and duration of exposure to BuSpar (buspirone) varied greatly, involving well-controlled studies as well as experience in open and uncontrolled clinical settings. As part of the total experience gained in clinical studies, various adverse events were reported. In the absence of appropriate controls in some of the studies, a causal relationship to BuSpar (buspirone hydrochloride) treatment cannot be determined. The list includes all undesirable events reasonably associated with the use of the drug.
The following enumeration by organ system describes events in terms of their relative frequency of reporting in this data base. Events of major clinical importance are also described in the PRECAUTIONS section.
The following definitions of frequency are used: Frequent adverse events are defined as those occurring in at least 1/100 patients. Infrequent adverse events are those occurring in 1/100 to 1/1000 patients, while rare events are those occurring in less than 1/1000 patients.
Frequent was nonspecific chest pain; infrequent were syncope, hypotension, and hypertension; rare were cerebrovascular accident, congestive heart failure, myocardial infarction, cardiomyopathy, and bradycardia.
Central Nervous System
Frequent were dream disturbances; infrequent were depersonalization, dysphoria, noise intolerance, euphoria, akathisia, fearfulness, loss of interest, dissociative reaction, hallucinations, involuntary movements, slowed reaction time, suicidal ideation, and seizures; rare were feelings of claustrophobia, cold intolerance, stupor, and slurred speech and psychosis.
Frequent were tinnitus, sore throat, and nasal congestion; infrequent were redness and itching of the eyes, altered taste, altered smell, and conjunctivitis; rare were inner ear abnormality, eye pain, photophobia, and pressure on eyes.
Rare were galactorrhea and thyroid abnormality.
Infrequent were muscle cramps, muscle spasms, rigid/stiff muscles, and arthralgias; rare was muscle weakness.
Infrequent were decreased or increased libido; rare were delayed ejaculation and impotence.
Postmarketing experience has shown an adverse experience profile similar to that given above. Voluntary reports since introduction have included rare occurrences of allergic reactions (including urticaria), angioedema, cogwheel rigidity, dizziness (rarely reported as vertigo), dystonic reactions (including dystonia), ataxias, extrapyramidal symptoms, dyskinesias (acute and tardive), ecchymosis, emotional lability, serotonin syndrome, transient difficulty with recall, urinary retention, visual changes (including tunnel vision), parkinsonism, akathisia, restless leg syndrome, and restlessness. Because of the uncontrolled nature of these spontaneous reports, a causal relationship to BuSpar (buspirone) treatment has not been determined.
Drug Abuse And Dependence
Controlled Substance Class
BuSpar (buspirone hydrochloride) is not a controlled substance.
Physical and Psychological Dependence
In human and animal studies, buspirone has shown no potential for abuse or diversion and there is no evidence that it causes tolerance, or either physical or psychological dependence. Human volunteers with a history of recreational drug or alcohol usage were studied in two double-blind clinical investigations. None of the subjects were able to distinguish between BuSpar (buspirone) and placebo. By contrast, subjects showed a statistically significant preference for methaqualone and diazepam. Studies in monkeys, mice, and rats have indicated that buspirone lacks potential for abuse.
Following chronic administration in the rat, abrupt withdrawal of buspirone did not result in the loss of body weight commonly observed with substances that cause physical dependency.
Although there is no direct evidence that BuSpar (buspirone) causes physical dependence or drug-seeking behavior, it is difficult to predict from experiments the extent to which a CNS-active drug will be misused, diverted, and/or abused once marketed. Consequently, physicians should carefully evaluate patients for a history of drug abuse and follow such patients closely, observing them for signs of BuSpar (buspirone) misuse or abuse (eg, development of tolerance, incrementation of dose, drug-seeking behavior).
Read the entire FDA prescribing information for Buspar (Buspirone) »
Additional Buspar Information
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