Hi My sister is prescribed lithium tablets as part of her treatment for schizophrenia buy the medicine is creating constipation problem fof her. She has difficulty in passing stools and goes without freshing upto 2 days which means she either does not eat or she vomits whatever she eats. Lactulose syrup too is not helping. What should we do? Psychiatrist and allopathic general doctor seldom are together to prescribe best possible combo for her