It is a barbiturate drug. Because it has a sedative effect, it is being displaced by other anti-epilepsy drugs in the treatment of chronic epilepsy. Excretion into the breast milk is quite variable with concentrations that could reach clinically significant levels. A sedative effect in infants from mothers who were treated has been described, as well as Abstinence Syndrome with spasms after sudden weaning, mostly in newborns. Follow-up for alertness and adequate feeding in the infant is recommended. Plasma level monitoring may be required in infants for both cases in which sedation has occurred or a follow-up for a progressive weaning is desired.