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BuSpar ® (buspirone hydrochloride tablets, USP) is an antianxiety agent that is not
chemically or pharmacologically related to the benzodiazepines, barbiturates, or other
sedative/anxiolytic drugs.
Buspirone hydrochloride is a white crystalline, water soluble compound with a molecular
weight of 422.0. Chemically, buspirone hydrochloride is 8-[4-[4-(2-pyrimidinyl)-1-
piperazinyl]butyl]-8-azaspiro[4.5]decane-7,9-dione monohydrochloride.
BuSpar is supplied as tablets for oral administration containing 5 mg, 10 mg, 15 mg, or
30 mg of buspirone hydrochloride, USP (equivalent to 4.6 mg, 9.1 mg, 13.7 mg, and
27.4 mg of buspirone free base, respectively). The 5 mg and 10 mg tablets are scored so
they can be bisected. Thus, the 5 mg tablet can also provide a 2.5 mg dose, and the 10 mg
tablet can provide a 5 mg dose. The 15 mg and 30 mg tablets are provided in the
DIVIDOSE® tablet design. These tablets are scored so they can be either bisected or
trisected. Thus, a single 15 mg tablet can provide the following doses: 15 mg (entire
tablet), 10 mg (two thirds of a tablet), 7.5 mg (one half of a tablet), or 5 mg (one third of
a tablet). A single 30 mg tablet can provide the following doses: 30 mg (entire tablet),
20 mg (two thirds of a tablet), 15 mg (one half of a tablet), or 10 mg (one third of a
tablet). BuSpar Tablets contain the following inactive ingredients: colloidal silicon
dioxide, lactose, magnesium stearate, microcrystalline cellulose, and sodium starch
glycolate. The 30 mg tablet also contains iron oxide.
WARNINGS
The administration of BuSpar to a patient taking a monoamine oxidase inhibitor
(MAOI) may pose a hazard. There have been reports of the occurrence of elevated
blood pressure when BuSpar (buspirone hydrochloride) has been added to a regimen
including an MAOI. Therefore, it is recommended that BuSpar not be used
concomitantly with an MAOI.
Because BuSpar has no established antipsychotic activity, it should not be employed in
lieu of appropriate antipsychotic treatment.
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