Methamphetamine use while Breastfeeding
Drugs containing Methamphetamine: Desoxyn, Desoxyn Gradumet
Methamphetamine Levels and Effects while Breastfeeding
Summary of Use during Lactation
Because there is no published experience with methamphetamine as a therapeutic agent during breastfeeding, an alternate drug may be preferred, especially while nursing a newborn or preterm infant.
Methamphetamine should not be used as a recreational drug by nursing mothers because it may impair their judgment and child care abilities. Methamphetamine and its metabolite, amphetamine, are detectable in breastmilk and infant's serum after abuse of methamphetamine by nursing mothers. However, these data are from random collections rather than controlled studies because of ethical considerations in administering recreational methamphetamine to nursing mothers. Other factors to consider are the possibility of positive urine tests in breastfed infants which might have legal implications, and the possibility of other harmful contaminants in street drugs. In mothers who abuse methamphetamine while nursing, withholding breastfeeding for 24 to 48 hours after the maternal dose has been recommended. However, breastfeeding is generally discouraged in mothers who are actively abusing amphetamines.
Maternal Levels. Two nursing mothers who were intravenous methamphetamine abusers collected milk samples just before methamphetamine injection and every 2 to 6 hours after injection for 24 hours. Because the drugs were illicit street drugs, the doses of methamphetamine were not known. Peak and average milk methamphetamine concentrations were about 160 mcg/L and 111 mcg/L in one woman and 610 mcg/L and 281 mcg/L in the other, respectively. Milk methamphetamine concentrations fell with half-lives of 13.6 and 7.4 hours, respectively. Amphetamine, thought to be derived from metabolism of methamphetamine, was present in relatively constant concentrations in the milk of both mothers, averaging 4 and 15 mcg/L, respectively. The authors estimated that the infants would have received 16.7 and 42.2 mcg/kg per day of methamphetamine and 0.8 and 2.5 mcg/kg per day of amphetamine, respectively. These estimated mg/kg infant doses of methamphetamine are lower than therapeutic doses of the equipotent dextroamphetamine for older children with attention deficit hyperactivity disorder. However, this is not evidence of safety for breastfed infants because the data on these two women can not be extrapolated to other methamphetamine abusers.
Thirty-three mothers in Thailand were identified who had predelivery urine drug screens positive for methamphetamine. On average they used methamphetamine 2.4 times per week, primarily by smoking crushed tablets. Of these, 22 had undetectable postpartum methamphetamine milk levels. Of the 11 mothers with methamphetamine in breastmilk, only two mothers had 4 consecutive milk samples containing methamphetamine that were analyzed. The mothers had smoked methamphetamine (dosage uncertain) 53 and 68 hours prior to delivery, respectively. First milk samples contained 142 and 345 mcg/L of methamphetamine in the two mothers. The half-lives of methamphetamine in breastmilk were 11.3 and 30.3 hours, respectively. The authors estimated that in the first 24 hours after birth their exclusively breastfed infant would have received 59.3 mcg or 21.3 mcg/kg/day in the first case and 93.0 mcg or 51.7 mcg/kg/day in the second case. Methamphetamine became undetectable in breastmilk about 100 hours after the last drug use in both mothers, which was about one day prior to the mothers' urine becoming negative for methamphetamine. Infant Levels. Relevant published information was not found as of the revision date.
Effects in Breastfed Infants
A 2-month-old infant whose mother used illicit street methamphetamine recreationally by nasal inhalation was found dead 8 hours after a small amount of breastfeeding and ingestion of 120 to 180 mL of formula. The infant's serum methamphetamine concentration on autopsy was 39 mcg/L. Although the infant's mother was convicted of child endangerment for the use of methamphetamine during breastfeeding, the role that methamphetamine played in the infant's death has been questioned because of the low infant serum methamphetamine concentration and the mother's alleged minimal breastfeeding.
Effects on Lactation and Breastmilk
A single oral dose of 0.2 mg/kg to a maximum of 17.5 mg of d-methamphetamine was given to 6 subjects (4 male and 2 female). Serum prolactin concentrations were unchanged over a period of 300 minutes after the dose.
In 2 papers by the same authors, 20 women with normal physiologic hyperprolactinemia were studied on days 2 or 3 postpartum. Eight received dextroamphetamine 7.5 mg intravenously, 6 received 15 mg intravenously and 6 who served as controls received intravenous saline. The 7.5 mg dose reduced serum prolactin by 25 to 32% compared to control, but the difference was not statistically significant. The 15 mg dose significantly decreased serum prolactin by 30 to 37% at times after the infusion. No assessment of milk production was presented. The authors also quoted data from another study showing that a 20 mg oral dose of dextroamphetamine produced a sustained suppression of serum prolactin by 40% in postpartum women.
A study compared 31 methamphetamine-dependent subject to 23 non-dependent subjects. The serum prolactin concentrations in the methamphetamine-dependent subjects were elevated at days 2 and 30 of abstinence. The elevation was greater in women than in men. The maternal prolactin level in a mother with established lactation may not affect her ability to breastfeed.
In a retrospective Australian study, mothers who used intravenous amphetamines during pregnancy were less likely to be breastfeeding their newborn infants at discharge than mothers who abused other drugs (27% vs 42%). The cause of this difference was not determined.
A prospective, multicenter study followed mothers who used methamphetamine prenatally (n = 204) to those who did not (n = 208). Mothers who used methamphetamine were less likely to breastfeed their infants (38%) at hospital discharge than those who did not use methamphetamine (76%).
Alternate Drugs to Consider
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2. Chomchai C, Chomchai S, Kitsommart R. Transfer of methamphetamine (MA) into breast milk and urine of postpartum women who smoked MA tablets during pregnancy: Implications for initiation of breastfeeding. J Hum Lact. PMID: 26452730
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