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Apixaban (1) · Azelastine (1) · Dextromethorphan / Quinidine (1) · Doxycycline (1) · Flecainide (1) · Fluorouracil (5-FU) (1) · Guaifenesin (1) · Icosapent ethyl (eicosapentaenoic acid ethyl ester, EPA-EE) (1) · Ofloxacin (1) · Oseltamivir (1) · Riboflavin (vitamin B2) (1) · Ticagrelor (1) · Tretinoin (all-trans retinoic acid, ATRA) (1)

Astelin, Astepro (intranasal); Optivar (ophthalmic); with fluticasone as Dymista (1) · Brilinta (1) · Efudex (topical), Carac (topical), Fluoroplex (topical); generic IV (1) · Eliquis (1) · Floxin (oral, US brand discontinued); Ocuflox (ophthalmic); Floxin Otic (otic) (1) · Many generics/OTC (1) · Mucinex, Robitussin, Tussin (1) · Nuedexta (1) · Retin-A, Renova, Atralin, Avita, Tretin-X, Refissa, Altreno; Vesanoid (oral, APL) (1) · Tambocor (US brand discontinued) (1) · Tamiflu (1) · Vascepa (1) · Vibramycin, Doryx, Oracea, Adoxa, Monodox, Acticlate (1)

None (6) · '"`UNIQ--vote-000001F6-QINU`"' CYP3A4 (primary) and P-glycoprotein substrate; strong dual inhibitors or inducers materially shift exposure. Reversal: andexanet alfa for life-threatening bleeding; 4F-PCC commonly used off-label when andexanet unavailable'"`UNIQ--ref-000001F7-QINU`"'. (1) · '"`UNIQ--vote-0000104D-QINU`"' Adequate hydration is at least as important as the drug in producing the expectorant effect clinically. Used in combination with dextromethorphan, decongestants, or antihistamines in many proprietary OTC cold preparations. (1) · '"`UNIQ--vote-0000113A-QINU`"' Concomitant β-blocker or CCB is required when used for AF to prevent 1:1 atrial flutter conduction (flecainide can slow atrial rate to a level where AV conduction allows dangerous ventricular rates). CYP2D6 substrate'"`UNIQ--ref-0000113B-QINU`"'. (1) · '"`UNIQ--vote-0000124C-QINU`"' The 400 mg/d dose for migraine prophylaxis is supported by randomized trials (Schoenen 1998) and remains a low-risk evidence-based supplement option. Characteristic bright-yellow urine fluorescence with high-dose oral supplementation. (1) · '"`UNIQ--vote-000013B1-QINU`"' Topical application minimizes systemic antihistaminic burden; the characteristic bitter taste with nasal use (drainage to oropharynx) is the main tolerability issue'"`UNIQ--ref-000013B2-QINU`"'. (1) · '"`UNIQ--vote-000014BC-QINU`"' Topical ophthalmic and otic formulations remain widely used in ENT and ophthalmology. Subject to all fluoroquinolone-class restrictions (tendinitis/rupture, peripheral neuropathy, QT prolongation)'"`UNIQ--ref-000014BD-QINU`"'. (1) · '"`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)

1 capsule (20/10 mg dextromethorphan/quinidine) PO once daily × 7 days, then 1 capsule BID (1) · 100 mg PO BID; rickettsial 200 mg/d; doxy-PEP 200 mg within 72 hours after condomless sex (1) · 2 g PO BID with meals (4 g/d total) (1) · 200-400 mg PO q4h (IR); 600-1200 mg PO q12h (Mucinex 12-Hour ER) (1) · 50 mg PO BID; titrate to 100-200 mg BID; pill-in-pocket 200-300 mg PO single dose for AF conversion (1) · ACS/PCI: 180 mg PO loading dose, then 90 mg PO BID for 12 months; long-term post-MI: 60 mg BID (1) · Intranasal 0.1% or 0.15%: 1-2 sprays/nostril BID; ophthalmic 0.05%: 1 drop in each eye BID (1) · Migraine prophylaxis: 400 mg PO daily; deficiency replacement 5-30 mg/d (1) · NVAF: 5 mg PO BID (2.5 mg BID if 2 of 3: age ≥80, weight ≤60 kg, serum creatinine ≥1.5 mg/dL); acute VTE: 10 mg BID for 7 days, then 5 mg BID (1) · Oral 200-400 mg BID; ophthalmic 1-2 drops in affected eye(s) q2-4h initially, then taper; otic 5-10 drops in affected ear BID (1) · Topical: 0.5-5% cream/solution to lesions BID × 2-4 weeks; systemic IV: regimen-specific in cancer chemotherapy (1) · Topical: pea-sized amount to dry face at bedtime, building from 2-3×/week to nightly as tolerated; oral APL: 45 mg/m²/d in divided doses (1) · Treatment: 75 mg PO BID × 5 days (adult); pediatric weight-based; prophylaxis: 75 mg PO once daily × 7-10 days (1)

0.1%, 0.15% intranasal spray; 0.05% ophthalmic solution; combination Dymista (azelastine 0.137 mg + fluticasone 50 mcg/spray) (1) · 0.5 g, 1 g capsules (1) · 0.5% (Carac), 1% (Fluoroplex), 5% (Efudex) topical creams/solutions; 50 mg/mL IV (1) · 100, 200, 400 mg IR tablets; 600 mg, 1200 mg Mucinex ER tablets; many liquid formulations and combination products with dextromethorphan, pseudoephedrine, antihistamines (1) · 2.5 mg, 5 mg tablets (1) · 20 mg dextromethorphan HBr / 10 mg quinidine sulfate capsules (1) · 200, 300, 400 mg tablets (mostly generic now); 0.3% ophthalmic solution; 0.3% otic solution (1) · 25, 50, 100, 250, 400 mg tablets; OTC (1) · 30, 45, 75 mg capsules; 6 mg/mL oral suspension (1) · 50 mg, 75 mg, 100 mg, 150 mg tablets and capsules; delayed-release; suspension; IV (1) · 50, 100, 150 mg tablets (1) · 60, 90 mg tablets (1) · Topical 0.01-0.1% creams, gels, micropsheres, lotions; oral 10 mg capsules (Vesanoid) (1)

1 capsule BID (40 mg DXM / 20 mg quinidine per day) (1) · 10 mg BID for the first 7 days of acute VTE; otherwise 5 mg BID (1) · 150 mg/d (treatment) (1) · 2 sprays/nostril BID (1) · 2.4 g/d (1) · 4 g/d (1) · 400 mg/d (1) · 800 mg/d (1) · 90 mg BID (acute year); 60 mg BID (chronic post-MI) (1) · No strict ceiling for water-soluble vitamin; UL not set (1) · Topical: nightly; oral APL: 45 mg/m²/d (1) · Topical: nightly; systemic: regimen-specific (1) · ~200 mg/d for most indications; higher doses for severe infections (1)

Intranasal (1) · IV (2) · IV (rare) (1) · ophthalmic (1) · Oral (10) · oral (APL only) (1) · otic (1) · Topical (2) · topical ophthalmic (1)

15 minutes (1) · 30 minutes (1) · AF conversion within hours of single PO dose (1) · Antiplatelet effect within 30 minutes of loading dose (faster than clopidogrel) (1) · Hours (2) · Migraine effect after 1-3 months of daily use (1) · PBA episode reduction within 1-2 weeks (1) · Peak anticoagulant effect 3-4 hours (1) · Symptom shortening detectable within 24-48 hours of starting (small absolute benefit; ~1 day reduction in symptom duration) (1) · Topical: inflammation, erythema, crusting at 2 weeks; complete response weeks to months after course (1) · Topical: irritation within days; acne improvement 6-12 weeks; oral APL response within days (1) · Triglyceride lowering at 4-8 weeks; CV benefit emerges over months (1)

16-22 hours'"`UNIQ--ref-0000047D-QINU`"' (1) · Dextromethorphan substantially prolonged by quinidine's CYP2D6 inhibition (typical extensive metabolizers see ~10× higher AUC); quinidine ~6-8 hours'"`UNIQ--ref-00001583-QINU`"' (1) · ~0.5-2 hours (oral)'"`UNIQ--ref-00000BA3-QINU`"' (1) · ~1 hour'"`UNIQ--ref-00001050-QINU`"' (1) · ~1-2 hours plasma (riboflavin itself); FAD/FMN tissue cofactors are continuous (1) · ~10-20 minutes systemically (rapid hepatic and erythrocyte dihydropyrimidine dehydrogenase clearance)'"`UNIQ--ref-000011BE-QINU`"' (1) · ~12 hours'"`UNIQ--ref-000001FB-QINU`"' (1) · ~14 hours (adults); longer in elderly and renal impairment'"`UNIQ--ref-0000113F-QINU`"' (1) · ~22 hours; longer 54 hours (desmethylazelastine, active metabolite)'"`UNIQ--ref-000013B6-QINU`"' (1) · ~6-10 hours (oseltamivir carboxylate, the active metabolite)'"`UNIQ--ref-00000E94-QINU`"' (1) · ~7 hours (parent); ~9 hours (active AR-C124910XX metabolite, accounts for ~30-40% of activity)'"`UNIQ--ref-00000C92-QINU`"' (1) · ~89 hours (EPA, the active metabolite)'"`UNIQ--ref-000013D1-QINU`"' (1) · ~9 hours'"`UNIQ--ref-000014C3-QINU`"' (1)

High (oral)'"`UNIQ--ref-00001051-QINU`"' (1) · Increased substantially via CYP2D6 inhibition'"`UNIQ--ref-00001584-QINU`"' (1) · Intranasal ~40% systemic; ophthalmic minimal'"`UNIQ--ref-000013B7-QINU`"' (1) · Substantially improved with high-fat meal; take with food'"`UNIQ--ref-000013D2-QINU`"' (1) · Topical: minimal systemic absorption (oral systemic 5-FU not used due to poor and variable absorption)'"`UNIQ--ref-000011BF-QINU`"' (1) · Topical: minimal systemic absorption with normal skin; oral: variable, induced metabolism with repeated dosing'"`UNIQ--ref-00000BA4-QINU`"' (1) · ~36% (oral)'"`UNIQ--ref-00000C93-QINU`"' (1) · ~50% (oral; not significantly affected by food)'"`UNIQ--ref-000001FC-QINU`"' (1) · ~50-60% (oral; food enhances) (1) · ~75% (oral, as the active carboxylate after hepatic esterase activation)'"`UNIQ--ref-00000E95-QINU`"' (1) · ~90% (oral)'"`UNIQ--ref-00001140-QINU`"' (1) · ~95% (oral)'"`UNIQ--ref-000014C4-QINU`"' (1) · ~95% (oral; reduced by dairy, antacids, iron via divalent-cation chelation, though less than for tetracycline itself)'"`UNIQ--ref-0000047E-QINU`"' (1)

OTC (Astepro 0.15%) and [[USLegal:Prescription only|Rx-only]] (other intranasal, ophthalmic, Dymista) in US (1) · OTC in US (2) · [[USLegal:Prescription only|Rx-only]] in US (6) · [[USLegal:Prescription only|Rx-only]] in US. '''Contraindicated in structural heart disease''' — CAST trial (1989) showed increased mortality from class IC agents in patients with prior MI; modern use is limited to structurally normal hearts'"`UNIQ--ref-00001141-QINU`"' (1) · [[USLegal:Prescription only|Rx-only]] in US. Carries a '''Boxed Warning''' for bleeding risk and against aspirin maintenance doses above 100 mg/d (reduces ticagrelor efficacy, per PLATO subgroup analysis)'"`UNIQ--ref-00000C94-QINU`"' (1) · [[USLegal:Prescription only|Rx-only]] in US. Carries the same fluoroquinolone-class '''Boxed Warnings''' as ciprofloxacin/levofloxacin'"`UNIQ--ref-000014C5-QINU`"' (1) · [[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)