Study of the Breast Milk Pharmacokinetics of Olanzapine and Samidorphan

Inclusion Criteria: * Body mass index ≥18 and \<35 kg/m2 * Subject is lactating, at least 4 weeks post-partum at dosing, and is using or willing to use an electronic breast pump for sample collection * Subject is willing to temporarily discontinue breastfeeding for the duration of at least 11 days post-dose * Subject is exclusively breastfeeding and/or pumping milk, or if not exclusively breastfeeding/pumping, has an adequate milk supply as judged by the Investigator * Subject's infant is able to bottle-feed * Subject agrees to use contraception during the study Exclusion Criteria: * Subject has a history of lumpectomy, mastectomy, breast implants, breast augmentation, or breast reduction surgery * Breastfeeding is not well-established or milk supply is low as judged by the Investigator * Subject has mastitis or other condition that may prevent the collection of milk from one or both breasts * Subject is pregnant or plans to become pregnant during the study * Subject has had a clinically significant illness within 30 days or has had a serious infection (eg, pneumonia or septicemia) within the 3 months * Subject has had any vaccination within 2 weeks prior to Screening or plans to have any vaccination during the study * Subject has a history of known or suspected intolerance, allergy, or hypersensitivity to olanzapine or opioid antagonists, , or any component of the study drug (eg naltrexone, naloxone) * Subject has a history of cardiovascular disease, cerebrovascular disease, a seizure disorder, personal or family history of neuroleptic malignant syndrome, or known risk of narrow-angle glaucoma or orthostatic hypotension * Subject has a current or anticipated need for prescribed opioid medication during the study period * Subject has a positive urine drug screen for amphetamine, barbiturates, cannabinoids, cocaine, or opioids or positive cotinine test