welcome to lybrate
from the above details its clear that your patient was on fludac
. Now that you want to stop these medications and want to start haloperidol
but are concerned about any harmful withdrawal effects of previous medication.
As your patient was on 40 mg of fludac and risperidone 0.5mg. So these medications can be stopped immediately as well without any withdrawal effects or negative repercussions. If your patient have been diagnosed as having psychosis
, than haloperidol is also an antipsychotic medication which will suppress the psychotic symptoms. Fludac have a longer half life, hence sudden withdrawal will not affect its blood levels to much, hence will not produce any withdrawal effects. For any other query you can also consult me in private