DEXONE 0.75
Clinical safety rating: caution
Comprehensive clinical and safety monograph for DEXONE 0.75 (DEXONE 0.75).
Dexamethasone is a potent glucocorticoid that binds to glucocorticoid receptors, modulating gene expression to inhibit pro-inflammatory cytokines (e.g., IL-1, IL-6, TNF-α) and reduce inflammation, immune response, and adrenal function.
| Metabolism | Primarily hepatic via CYP3A4; also undergoes 11β-hydroxysteroid dehydrogenase conversion. |
| Excretion | Renal: ~65-80% as unchanged drug; Fecal: ~10-15% as metabolites; Minor biliary excretion. |
| Half-life | Terminal elimination half-life: 36-54 hours in adults with normal renal function; prolonged to 72-168 hours in severe renal impairment. |
| Protein binding | ~80% bound to albumin and cortisol-binding globulin (CBG). |
| Volume of Distribution | Vd: 1.0-1.5 L/kg; indicates extensive tissue distribution. |
| Bioavailability | Oral: 85-95% (well absorbed). |
| Onset of Action | Oral: 1-2 hours; IV: 15-30 minutes; IM: 30-60 minutes. |
| Duration of Action | Oral: 24-36 hours (symptom relief); IV: 12-24 hours (hemodynamic effects); Clinical note: Taper to avoid adrenal insufficiency. |
0.75 mg orally once daily, typically as part of a tapering regimen for anti-inflammatory or immunosuppressive effects.
| Dosage form | TABLET |
| Renal impairment | No dose adjustment required for renal impairment; drug is primarily hepatically metabolized. |
| Liver impairment | Child-Pugh A: no adjustment; Child-Pugh B: reduce dose by 50%; Child-Pugh C: avoid use or reduce dose by 75% with monitoring. |
| Pediatric use | 0.02-0.3 mg/kg/day orally divided every 6-12 hours; maximum 0.75 mg/day. Dosing based on indication and response. |
| Geriatric use | Start at lowest effective dose (e.g., 0.375 mg once daily) and titrate slowly due to increased risk of osteoporosis, hyperglycemia, and immunosuppression. |
| 1st trimester | Consult provider |
| 2nd trimester | Consult provider |
| 3rd trimester | Consult provider |
Clinical note
Comprehensive clinical and safety monograph for DEXONE 0.75 (DEXONE 0.75).
| Breastfeeding | Enters breast milk; M/P ratio approximately 0.4. Low concentrations relative to infant endogenous cortisol. Short-term use generally considered compatible; high doses may warrant monitoring for infant adrenal suppression. |
| Teratogenic Risk | DEXONE (dexamethasone) is a corticosteroid. First trimester: Increased risk of cleft lip/palate (odds ratio ~3.4). Second/third trimester: Fetal growth restriction, adrenal suppression, premature birth. Chronic exposure may cause HPA axis suppression in neonate. |
■ FDA Black Box Warning
No FDA boxed warning exists for dexamethasone.
| Serious Effects |
["Hypersensitivity to dexamethasone or any component","Systemic fungal infections","Concurrent live or live-attenuated vaccines"]
| Precautions | ["Increased risk of infections due to immunosuppression","Hypothalamic-pituitary-adrenal axis suppression","Exacerbation of systemic fungal infections","Increased risk of gastrointestinal perforation or bleeding","Osteoporosis with prolonged use","Cushing's syndrome with high doses","Ocular effects: glaucoma, cataracts","Vaccination risk: live vaccines may cause disseminated infection","Use in pregnancy: risk of fetal harm"] |
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| Fetal Monitoring |
| Maternal: Blood pressure, blood glucose, serum electrolytes, signs of infection. Fetal: Ultrasound for growth restriction (every 4-6 weeks if prolonged use), fetal heart rate monitoring if preterm labor. Neonatal: Observe for adrenal insufficiency if maternal use near delivery. |
| Fertility Effects | May inhibit ovulation by suppressing pituitary-adrenal axis; reversible upon discontinuation. No evidence of permanent fertility impairment in males or females. |