Fluvoxamine use while Breastfeeding
Drugs containing Fluvoxamine: Luvox, Luvox CR
Fluvoxamine Levels and Effects while Breastfeeding
Summary of Use during Lactation
Limited information indicates that maternal fluvoxamine doses of up to 300 mg daily produce low levels in breastmilk and would not be expected to cause any adverse effects in breastfed infants, especially if the infant is older than 2 months. One infant was reported to have an elevated serum level of fluvoxamine, but most who have been tested have undetectable serum levels. No adverse effects on breastfed infants have been reported, including a limited amount of long-term follow-up on growth and development. Mothers taking an SSRI during pregnancy and postpartum may have more difficulty breastfeeding and may need additional breastfeeding support.
Maternal Levels In a pooled analysis of serum levels from published studies and 1 unpublished case, the authors found that 6 mothers taking an average daily dosage of 159 mg (range 50 to 300 mg) had an average milk fluvoxamine level of 174 mcg/L (range 18 to 478 mcg/L). Using the average dosage and milk level data from this paper, an exclusively breastfed infant would receive an estimated 0.98% of the maternal weight-adjusted dosage of fluvoxamine.
Two mothers breastfeeding while taking stable doses of fluvoxamine were studied with timed blood and milk samples over 24 hours. The first patient, who was taking 150 mg daily and nursing a 26-month-old, had a peak milk level of 425 mcg/L at 2.1 hours after the dose. The second patient, who was taking 50 mg daily and nursing a 3-week-old, had a peak milk level of 67 mcg/L at 4.2 hours after the dose. The authors estimated the absolute infant dosages to be 38.4 and 5.4 mcg/kg daily in the two infants, respectively, or an average 1.38% and 0.8% of the maternal weight-adjusted dosage.
Infant Levels Four exclusively breastfed infants aged 6 to 13 weeks had undetectable (<1 mcg/L) fluvoxamine serum levels during maternal therapy with fluvoxamine in dosages of 100 to 150 mg daily.
In a pooled analysis of 3 mother-infant pairs from published and unpublished cases, the authors found that breastfed infants had an average of 16% (range 0 to 45%) of their mothers' fluvoxamine plasma levels; 1 of the 3 infants had a plasma level greater than 10% of the mother's which was defined by the authors as being elevated.
Serum levels of fluvoxamine were undetectable (<2 mcg/L) in a partially breastfed 26-month-old during maternal intake of 150 mg daily. Fluvoxamine was also undetectable in the serum of an exclusively breastfed 3-week-old during maternal intake of 50 mg daily.
Effects in Breastfed Infants
One infant whose mother began taking fluvoxamine 100 mg daily 17 weeks postpartum was breastfed from birth to 5 months of age. The medical and nursing staff did not note any adverse effect in the infant during the 10 weeks of observation during maternal hospitalization. The infant had normal Bayley developmental scores at age 4 months and 21 months.
No adverse effects were found in 2 infants, a partially breastfed 26-month-old during maternal intake of 150 mg daily, who also had a normal Denver Developmental Score, and an exclusively breastfed 3-week-old during maternal intake of 50 mg daily.
Three mothers who took an average fluvoxamine dose of 117 mg once daily breastfed their infants exclusively for 4 months and at least 50% during months 5 and 6. Their infants had 6-month weight gains that were normal according to national growth standards and the mothers reported no abnormal effects in their infants.
One study of the side effects of SSRI antidepressants in nursing mothers found no adverse reactions that required medical attention in one infant whose mother was taking fluvoxamine. No specific information on maternal fluvoxamine dosage, extent of breastfeeding or infant age was reported.
A woman who was treated chronically with quetiapine 400 mg and fluvoxamine 200 mg daily took the drugs throughout pregnancy and postpartum. She partially breastfed her infant (extent not stated) for 3 months from birth. No adverse events were seen in the infant who developed normally.
Effects on Lactation and Breastmilk
Fluvoxamine has caused increased prolactin levels and galactorrhea in nonpregnant, nonnursing patients.  In one case, euprolactinemic gynecomastia and galactorrhea occurred in a 19-year-old man who was also taking risperidone. In a study of cases of hyperprolactinemia and its symptoms (e.g., gynecomastia) reported to a French pharmacovigilance center, fluvoxamine was found to have a 4.5-fold increased risk of causing hyperprolactinemia compared to other drugs. The prolactin level in a mother with established lactation may not affect her ability to breastfeed.
In a small prospective study, 8 primiparous women who were taking a serotonin reuptake inhibitor (SRI; 3 taking fluoxetine and 1 each taking citalopram, duloxetine, escitalopram, paroxetine or sertraline) were compared to 423 mothers who were not taking an SRI. Mothers taking an SRI had an onset of milk secretory activation (lactogenesis II) that was delayed by an average of 16.7 hours compared to controls (85.8 hours postpartum in the SRI-treated mothers and 69.1 h in the untreated mothers), which doubled the risk of delayed feeding behavior in the untreated group. However, the delay in lactogenesis II may not be clinically important, since there was no statistically significant difference between the groups in the percentage of mothers experiencing feeding difficulties after day 4 postpartum.
A case control study compared the rate of predominant breastfeeding at 2 weeks postpartum in mothers who took an SSRI antidepressant throughout pregnancy and at delivery (n = 167) or an SSRI during pregnancy only (n = 117) to a control group of mothers who took no antidepressants (n = 182). Among the two groups who had taken an SSRI, 33 took citalopram, 18 took escitalopram, 63 took fluoxetine, 2 took fluvoxamine, 78 took paroxetine, and 87 took sertraline. Among the women who took an SSRI, the breastfeeding rate at 2 weeks postpartum was 27% to 33% lower than mother who did not take antidepressants, with no statistical difference in breastfeeding rates between the SSRI-exposed groups.
Alternate Drugs to Consider
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Serotonin Uptake Inhibitors
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