If you are going to have surgery, be sure to tell your doctor or dentist that you are taking haloperidol.

Some products that may interact with this drug include: anticholinergic medications (e.g., antispasmodics such as belladonna alkaloids, scopolamine), cabergoline, ketoconazole, lithium, methyldopa, drugs for Parkinson's disease (e.g., levodopa and carbidopa, selegiline), paroxetine, pergolide, quinupristin-dalfopristin, rifampin, saquinavir.