Drug Levels and Effects:

Summary of Use during Lactation:

Maternal doses of levetiracetam up to 3500 mg daily produce low levels in milk and would not be expected to cause any adverse effects in breastfed infants, especially if the infant is older than 2 months. If levetiracetam is required by the mother, it is not a reason to discontinue breastfeeding. However, the infant should be monitored for drowsiness, adequate weight gain, and developmental milestones, especially in younger, exclusively breastfed infants and when using combinations of anticonvulsants. Maternal serum level monitoring and dosage adjustment is advisable in the early postpartum period if the drug was taken throughout pregnancy and breastfeeding.[1]

Drug Levels:

In published reports of anticonvulsant use during breastfeeding, most women were taking a combination of anticonvulsants. Some other anticonvulsants (e.g., phenytoin, carbamazepine) stimulate the metabolism of other drugs including anticonvulsants, whereas others (e.g., valproic acid) inhibit the metabolism of other drugs. Therefore, the relationship of the maternal dosage to the concentration in breastmilk can be quite variable, making calculation of the weight-adjusted percentage of maternal dosage less meaningful than for other drugs in this database.

Maternal Levels.

A woman who was taking phenytoin, valproic acid and an unspecified dosage of levetiracetam had a milk levetiracetam level of 16.9 mg/L 3 hours after a dose, which was 3.1 times her simultaneous serum level.[1]

Breastmilk levels in 12 mothers who were monitored at 4 days and 2 to 3 months postpartum were "significantly lower" than maternal blood levels. Further details were not published in the abstract.[2]

Seven women taking an average of 2430 mg daily (range 1500 to 3500 mg daily) of levetiracetam plus various other anticonvulsants for epilepsy at the time of delivery had foremilk levels measured 3 to 5 days postpartum. Average milk levels were 12.5 mg/L (range 4.8 to 26 mg/L). Milk levels were again measured in 5 of the women plus another woman at one or more of the following times: 2, 4, 6 to 8 weeks and 4 or 10 months postpartum. Specific milk levels were not reported at those times, but the milk to plasma ratio was very similar at those times to the values at 3 to 5 days postpartum.[3] Eleven mothers who were 4 to 23 days postpartum and taking levetiracetam provided milk samples before nursing. Three women taking 100 mg daily had an average milk levetiracetam concentration of 8.68 mg/L (range 5.79 to 10.55 mg/L); 2 women taking 2000 mg daily had milk levels of 11.7 and 35.7 mg/L; 4 women taking 2500 mg daily had an average milk levetiracetam concentration of 13.95 mg/L (range 10 to 20.4 mg/L); and 2 women taking 3000 mg daily had milk concentrations of 17.4 and 29.1 mg/L. The authors estimated that a fully breastfed infant would receive 7.9% of the maternal weight-adjusted dosage.[4]

Infant Levels.

An infant (aged approximately 1 to 2 weeks) of a mother taking phenytoin, valproic acid and levetiracetam (dosage unspecified) had a serum levetiracetam level of 1 mg/L 96 hours after the mother discontinued breastfeeding.[1]

Seven breastfed infants whose mothers were taking an average dosage of 2430 mg daily (range 1500 to 3500 mg daily) of levetiracetam plus various other anticonvulsants during pregnancy and lactation had serum levetiracetam measured before the mother's morning dose at 3 to 5 days of age. In 6 infants, levetiracetam was undetectable (<1.7 mg/L), although one of them had a serum level of 13 mg/L at the age of 1 day. A seventh infant who was fully breastfed had a serum level of 2.5 mg/L at 3 to 5 days of age. This infant had serum levels ranging from 2.5 to 2.9 mg/L during the first 8 weeks of life and an undetectable serum level at 4 months of age.[3]

Ten infants who were 4 to 23 days old were breastfed by mothers taking levetiracetam in dosages of 1000 to 3000 mg daily. Infant plasma levels were obtained 30 to 120 minutes after nursing and before their mother's morning dose (10 to 15 hours after the last evening dose), except for one infant whose plasma was sampled before nursing. The average levetiracetam plasma concentration was 1.9 mg/L (range 0.7 to 3.4 mg/L). The infants' plasma levels averaged 13.5% of the maternal plasma concentration taken before their morning dose. The authors found that 13 newborns' levetiracetam elimination half-life averaged 18 hours, which is 2 to 3 times that of adults.[4]

Effects in Breastfed Infants:

An epileptic woman took phenytoin and valproic acid during pregnancy. She began breastfeeding on day 3 postpartum and had a seizure on day 7 postpartum. Levetiracetam (dosage not reported) was started and the infant became increasingly hypotonic and nursed poorly. Breastfeeding was discontinued and the infant was discharged from the hospital in a healthy condition.[2]

Seven exclusively breastfed infants whose mothers were taking an average dosage of 2430 mg daily (range 1500 to 3500 mg daily) of levetiracetam plus various other anticonvulsants during pregnancy and lactation appeared healthy to the investigators throughout the 6 to 8 week study period. An eighth partially breastfed infant whose mother was taking valproate and oxcarbazepine started taking levetiracetam 9 months postpartum appeared healthy at 10 months of age.[4]

No adverse effects were reported in 10 newborns who were 4 to 23 days old who were breastfed during maternal intake of levetiracetam 1000 to 3000 mg daily. Four mothers were also taking lamotrigine; 1 was taking carbamazepine; and one was taking tiagabine, clobazam and oxcarbazepine.[5]

A woman with long-standing seizure disorder was taking primidone and levetiracetam became pregnant. The dosage of her medications were reduced during pregnancy to provide a levetiracetam serum concentration of 40.5 mg/L and a primidone (</span>phenobarbital) serum concentration of 3.4 mg/L. The mother was instructed to discontinue breastfeeding after 3 days. The following day her infant developed withdrawal seizures. After reinstituting breastfeeding, the infant's seizures stopped and did not recur. The infant had no abnormal findings and was thriving and seizure free at 6 months of age.[6]

Possible Effects on Lactation:

Relevant published information was not found as of the revision date.

Alternate Drugs to Consider:

Dependent on the condition being treated.


1. Lopez-Fraile IP, Cid AO, Juste AO, Modrego PJ. Levetiracetam plasma level monitoring during pregnancy, delivery, and postpartum: clinical and outcome implications. Epilepsy Behav. 2009;15:372-5. PMID:19362602
2. Kramer G, Hosli I, Glanzmann R et al. Levetiracetam accumulation in human breast milk. Epilepsia. 2002;43 (Suppl 7):105. Abstract.
3. Greenhill L, Betts T, Yarrow H et al. Breast milk levels of levetiracetam after delivery. Epilepsia. 2004;45 (suppl 7):230. Abstract.
4. Johannessen SI, Helde G, Brodtkorb E. Levetiracetam concentrations in serum and in breast milk at birth and during lactation. Epilepsia. 2005;46:775-7. PMID:15857447
5. Tomson T, Palm R, Kallen K et al. Pharmacokinetics of levetiracetam during pregnancy, delivery, in the neonatal period, and lactation. Epilepsia. 2007. PMID:17381438
6. Rauchenzauner M, Kiechl-Kohlendorfer U, Rostasy K, Luef G. Old and new antiepileptic drugs during pregnancy and lactation - report of a case. Epilepsy Behav. 2011;20:719-20. PMID:21444249

Substance Identification:

Substance Name:


CAS Registry Number:


Drug Class:

  • Anticonvulsants

  • Administrative Information:

    LactMed Record Number:


    Last Revision Date:

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