FOVANE
Clinical safety rating: caution
Comprehensive clinical and safety monograph for FOVANE (FOVANE).
Selective serotonin reuptake inhibitor (SSRI); potentiates serotonergic activity by inhibiting reuptake of serotonin at the synaptic cleft.
| Metabolism | Extensively metabolized in the liver via CYP2D6, CYP2C9, CYP2C19, and CYP3A4; active metabolite norfluoxetine. |
| Excretion | Renal: 60% unchanged; fecal: 30% (as metabolites); biliary: 10%. |
| Half-life | Terminal half-life: 12-15 hours; clinical context: supports twice-daily dosing, steady-state achieved by day 3. |
| Protein binding | 92% bound to albumin and α1-acid glycoprotein. |
| Volume of Distribution | Vd: 1.2-1.8 L/kg; clinical meaning: extensive tissue distribution, > total body water. |
| Bioavailability | Oral: 65% (with first-pass effect); IM: 85%; rectal: 50%. |
| Onset of Action | Oral: 30-60 minutes; IV: 5-10 minutes; IM: 15-30 minutes. |
| Duration of Action | Oral: 8-12 hours; IV: 6-8 hours; clinical notes: duration may extend in hepatic impairment. |
Adults: 10 mg orally twice daily.
| Dosage form | TABLET |
| Renal impairment | GFR 30-89 mL/min: No adjustment. GFR 15-29 mL/min: Reduce to 5 mg twice daily. GFR <15 mL/min: Not recommended. |
| Liver impairment | Child-Pugh A: No adjustment. Child-Pugh B: Reduce dose to 5 mg twice daily. Child-Pugh C: Contraindicated. |
| Pediatric use | Not approved for pediatric use. |
| Geriatric use | Initiate at 5 mg twice daily; increase based on tolerability. |
| 1st trimester | Consult provider |
| 2nd trimester | Consult provider |
| 3rd trimester | Consult provider |
Clinical note
Comprehensive clinical and safety monograph for FOVANE (FOVANE).
| Breastfeeding | FOVANE is excreted in human breast milk; M/P ratio not established. Likely to suppress lactation due to dopamine agonist action. Discontinue breastfeeding or avoid use; use only if essential. |
| Teratogenic Risk | FOVANE is a dopamine agonist. In first trimester, there is increased risk of congenital malformations (cardiac, neural tube) based on animal studies; human data limited. Second and third trimesters: risk of premature labor and placental abruption at high doses. FOVANE is contraindicated in pregnancy unless benefit outweighs risk. |
■ FDA Black Box Warning
Increased risk of suicidal thinking and behavior in children, adolescents, and young adults with major depressive disorder and other psychiatric disorders.
| Serious Effects |
Concurrent use with MAOIs or within 14 days of MAOI therapy; known hypersensitivity to fluoxetine.
| Precautions | Serotonin syndrome with co-administration of other serotonergic agents; risk of bleeding with NSAIDs or anticoagulants; hyponatremia; activation of mania/hypomania; seizures; angle-closure glaucoma. |
| Food/Dietary | Avoid grapefruit and grapefruit juice as they increase fovaptan exposure. No other significant food interactions identified. |
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| Fetal Monitoring |
| Monitor maternal blood pressure, heart rate, and signs of pleural/retroperitoneal fibrosis. Fetal monitoring: ultrasound for growth, amniotic fluid index, and fetal heart rate. Periodic Doppler studies if used in pregnancy. |
| Fertility Effects | FOVANE may restore fertility in hyperprolactinemic patients by normalizing prolactin levels. In women, ovulation induction may occur; advise contraception if pregnancy not desired. In men, improved sperm parameters reported. No known adverse effects on gonadal function. |
| Clinical Pearls |
| FOVANE (fovaptan) is a selective V2 receptor antagonist indicated for euvolemic hyponatremia. Initiate therapy only in hospitalized patients with close monitoring of serum sodium and volume status. Avoid rapid correction (>8 mmol/L in 24h) to prevent osmotic demyelination. Do not use in hypovolemic hyponatremia. Contraindicated in anuria, hypersensitivity to fovaptan, or patients with uncorrected adrenal insufficiency. |
| Patient Advice | Do not reduce fluid intake while taking this medication; drink water only when thirsty. · Avoid grapefruit or grapefruit juice during treatment. · Report worsening thirst, confusion, or muscle cramps immediately. · Do not drive or operate machinery until you know how FOVANE affects you due to risk of dizziness or syncope. · If you miss a dose, take it as soon as you remember unless close to next dose; do not double the dose. · Keep regular appointments for blood tests to monitor sodium levels. |