The dose of Haldol Decanoate 50 or Haldol Decanoate 100 should be expressed in terms of its haloperidol content. The starting dose of haloperidol decanoate should be based on the patient's age, clinical history, physical condition, and response to previous antipsychotic therapy. The preferred approach to determining the minimum effective dose is to begin with lower initial doses and to adjust the dose upward as needed. For patients previously maintained on low doses of antipsychotics (. up to the equivalent of 10 mg/day oral haloperidol), it is recommended that the initial dose of haloperidol decanoate be 10–15 times the previous daily dose in oral haloperidol equivalents; limited clinical experience suggests that lower initial doses may be adequate.
In a related issue, Risperdal sales practices resulted in a 2012 provisional settlement totaling $ billion.  The United States Department of Justice began investigating Risperdal sales practices in 2004, and in 2010 joined a whistleblowers suit alleging bribes paid to Omnicare , the largest company supplying pharmaceutical drugs to nursing homes.   The allegations include that Johnson & Johnson and Janssen were warned by the . Food and Drug Administration (FDA) not to promote Risperdal as effective and safe for elderly patients when in fact it is associated with early death, but they did so; and that they in fact bribed Omnicare pharmacists tens of millions of dollars to promote the drug to care home physicians for this unapproved use. A settlement was provisionally agreed with Johnson & Johnson of around $ billion for this and related allegations, with Omnicare having already settled for around $100 million.  Former head of sales and president of Janssen, Alex Gorsky , who the Dept of Justice say “was actively involved” in the fraud, nevertheless become the new CEO of Johnson & Johnson in 2012. 
The influence of renal impairment on the pharmacokinetics of haloperidol has not been evaluated. About one-third of a haloperidol dose is excreted in urine, mostly as metabolites. Less than 3% of administered haloperidol is eliminated unchanged in the urine. Haloperidol metabolites are not considered to make a significant contribution to its activity, although for the reduced metabolite of haloperidol, back-conversion to haloperidol cannot be fully ruled out. Even though impairment of renal function is not expected to affect haloperidol elimination to a clinically relevant extent, caution is advised in patients with renal impairment, and especially those with severe impairment, due to the long half-life of haloperidol and its reduced metabolite, and the possibility of accumulation (see section ).