How Long Does Buspirone Stay In Your System For?
In our latest question and answer, the pharmacist discusses how long buspirone (Buspar) stays in your system for.
How long does buspirone stay in your system for?
Oct 16, 2022- Buspirone has a short half-life of 2 to 4 hours and is completely eliminated from your body in about 10 to 20 hours, meaning it stays in your system for less than 24 hours for most people.
- Taking buspirone with food can increase how long it stays in your system and significantly increase the amount of drug in your blood.
Answer
Buspirone has a relatively short half-life (i.e. the time it takes for 50% of the drug to be metabolized) of around 2 to 4 hours. It is generally thought that it takes around 5 half-lives for a drug to be considered completely metabolized and eliminated from the body.
Therefore, you can expect buspirone to be completely metabolized after about 10-20 hours. In other words, for most individuals, buspirone should stay in your system for less than 24 hours (one day).
It should be noted that taking buspirone with food may prolong the effects of the drug as well as reduce the clearance of the drug from the body.
In fact, according to the prescribing information for buspirone, food can increase the maximum concentration of the drug in the blood by over 100%! Therefore, if you take buspirone with food, it may stay in your system slightly longer than usual.
Buspirone Information
Buspirone is an anti-anxiety medication but is neither structurally nor pharmacologically similar to other anti-anxiety medications like benzodiazepines (e.g. Xanax).
Buspirone is commonly used for mild to moderate cases of anxiety and typically does not cause physical dependence and doesn't significantly affect cognition or motor function. In addition, it isn't associated with withdrawal reactions (for most individuals).
While buspirone is generally considered a safer medication to use for symptoms of anxiety when compared to other classes of drugs, it does not confer immediate relief of anxiety and effects can take up to two weeks to occur. More commonly, it takes around 3 to 6 weeks for full effects to take place.
When taken by mouth, buspirone is quickly absorbed and the onset of action is generally 30 minutes to one hour. Once taken consistently, the effects of each dose last around 8 to 12 hours. Thus, for most individuals, it is commonly dosed two to three times daily to retain the effect. As discussed above, the half-life of buspirone is 2-4 hours.
Lastly, the exact mechanism of action of buspirone isn't well known but is thought to affect certain serotonin and dopamine receptors in the body.
Final Words
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Glossary — Terms in This Answer
- Half-life
- The time it takes for the body to metabolize and reduce the amount of a drug in the system to half its original dose.
- Metabolized
- The process by which the body breaks down a drug into substances it can eliminate.
- Anti-anxiety medication
- A drug prescribed to reduce symptoms of anxiety and worry.
- Benzodiazepines
- A class of anti-anxiety drugs that work differently from buspirone and carry higher risks of dependence.
- Physical dependence
- A condition where the body adapts to a drug and experiences withdrawal symptoms when the drug is stopped.
- Onset of action
- The time it takes after taking a medication for its effects to begin.
- Serotonin
- A chemical messenger in the brain that affects mood, anxiety, and other functions.
- Dopamine receptors
- Proteins in the brain that respond to dopamine, a chemical involved in mood and motivation.
Dr. Brian Staiger, PharmD
Doctor of Pharmacy, board certified clinical pharmacist (BCPS), American Herbalist Guild, Medication Therapy Management certified
Brian Staiger, PharmD, BCPS, is a licensed pharmacist with more than 13 years of experience across retail pharmacy, clinical pharmacy, medication safety, pharmacy program development, and healthcare administration. He is the founder of HelloPharmacist.com, where he helps patients...
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