Maximum Recommended Dose of Fluvoxamine
The maximum recommended daily dose of fluvoxamine is 300 mg per day for adults, with doses above 100 mg given in two divided doses (larger dose at bedtime). 1
Adult Dosing Guidelines
According to FDA labeling, the dosing parameters for fluvoxamine in adults are:
- Starting dose: 50 mg once daily at bedtime
- Titration: Increase in 50 mg increments every 4-7 days as tolerated
- Maximum dose: 300 mg per day
- Dosing schedule: Total daily doses >100 mg should be divided into two doses, with the larger dose given at bedtime 1
This maximum dose is consistently supported across multiple clinical guidelines 2, 3 and has been used in clinical trials for various indications including OCD, anxiety disorders, and PTSD 4.
Special Population Considerations
Elderly and hepatically impaired patients require dose modification due to decreased clearance (approximately 50% reduction). These patients should undergo slower titration and may require lower maximum doses 1.
Pediatric patients (ages 8-17):
- Maximum dose: 200 mg/day for children up to age 11
- Adolescents may be titrated up to the adult maximum of 300 mg/day if needed for therapeutic benefit 1
Important Clinical Context
While 300 mg/day represents the FDA-approved maximum, there are rare clinical scenarios documented in the literature. One case report described remission of treatment-resistant OCD with 600 mg daily (double the standard maximum), which was tolerated for 3 months 5. However, this should be considered exceptional and not standard practice—the manufacturer's recommended maximum remains 300 mg/day 1.
The nonlinear pharmacokinetics of fluvoxamine mean that higher doses produce disproportionately higher plasma concentrations than predicted from lower doses 1, which increases the risk of adverse effects and drug interactions, particularly through extensive CYP450 enzyme inhibition 6.
Key safety consideration: Fluvoxamine has significant drug-drug interaction potential through inhibition of CYP1A2, CYP2C19, CYP2C9, CYP3A4, and CYP2D6 6, requiring careful medication review before prescribing, especially at higher doses.