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Medicines > generic : 1P-LSD or Dextromethorphan / Quinidine & fda max: 1 capsule BID (40 mg DXM / 20 mg quinidine per day)

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generic: (Click arrow to add another value)
brand:
Nuedexta (1)
classes:
None (1)
mechanism:
'"`UNIQ--vote-00001580-QINU`"' First FDA-approved treatment for PBA. The 10 mg quinidine daily dose is far below antiarrhythmic levels but sufficient to nearly fully inhibit CYP2D6, the basis of the combination's pharmacokinetic rationale'"`UNIQ--ref-00001581-QINU`"'. (1)
uses:
'"`UNIQ--vote-00001582-QINU`"' (1)
starting dose:
1 capsule (20/10 mg dextromethorphan/quinidine) PO once daily × 7 days, then 1 capsule BID (1)
preparations:
20 mg dextromethorphan HBr / 10 mg quinidine sulfate capsules (1)
fda max: (Click arrow to add another value)
routes:
Oral (1)
onset:
PBA episode reduction within 1-2 weeks (1)
duration:
12 hours (1)
halflife:
Dextromethorphan substantially prolonged by quinidine's CYP2D6 inhibition (typical extensive metabolizers see ~10× higher AUC); quinidine ~6-8 hours'"`UNIQ--ref-00001583-QINU`"' (1)
bioavailability:
Increased substantially via CYP2D6 inhibition'"`UNIQ--ref-00001584-QINU`"' (1)
pregnancy:
Limited data; quinidine has been used in pregnancy as antiarrhythmic.<sup class="pcp-cn" title="This claim needs a citation.">&#91;[[Pharmacopedia:Citation needed|citation&nbsp;needed]]&#93;</sup> (1)
legal:
[[USLegal:Prescription only|Rx-only]] in US. Caution with QT-prolonging medicines (quinidine itself is class IA antiarrhythmic, and the dose here, though sub-antiarrhythmic, still contributes to QT)'"`UNIQ--ref-00001585-QINU`"' (1)

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