Lonazep is the brand name; the name of the medicine is clonazepam. It is primarily meant to treat epilepsy and is not approved for use in psychoses. In any case is not a primary therapy in depression and/or psychosis.
Lonazep is excreted in the human milk and hence MUST not be used by women who are breast feeding. The drug will go to the baby and cause side effects some of them are potentially toxic such as: CNS disturbances including impaired alertness, depression, ataxia, respiratory depression, amnesia (loss of memory), tolerance, behaviour problems, somnolence (sleepiness), fatigue, muscle weakness, vertigo. Liver disorders, gastro-intestinal upset, blood dyscrasias, etc.
Either you must not take the drug or should stop breast feeding.