Haloperidol Decanoate Products | Cleanchem - Haloperidol Decanoate is a long-acting injectable form of haloperidol, used for the long-term treatment of schizophrenia and other psychiatric disorders. It is designed to be administered every few weeks, offering more consistent therapeutic levels for patients who have difficulty adhering to a daily medication regimen. This form of haloperidol is particularly beneficial for patients who are at risk of relapse due to inconsistent medication adherence.