Before receiving haloperidol injection or haloperidol extended-release injection,
tell your doctor and pharmacist if you are allergic to haloperidol, any other medications, or any of the ingredients in haloperidol injection or haloperidol extended-release injection. Ask your pharmacist for a list of the ingredients.
tell your doctor and pharmacist what other prescription and nonprescription medications, vitamins, nutritional supplements, and herbal products you are taking or plan to take. Be sure to mention any of the following: alprazolam (Xanax); amiodarone (Cordarone, Nexterone, Pacerone); anticoagulants (blood thinners); antifungals medications such as itraconazole (Onmel, Sporanox) and ketoconazole (Nizoral); antihistamines (in cough and cold medications); medications for anxiety, depression, irritable bowel disease, mental illness, motion sickness, Parkinson's disease, seizures, ulcers, or urinary problems; buspirone; carbamazepine (Carbatrol, Tegretol, Teril, others); chlorpromazine; disopyramide (Norpace); diuretics ('water pills'); epinephrine (Adrenalin, Epipen, Twinject, others); erythromycin (E.E.S., E-Mycin, Erythrocin); fluoxetine (Prozac, Sarafem, Selfemra); fluvoxamine (Luvox); lithium (Lithobid); moxifloxacin (Avelox); narcotic medications for pain; nefazodone; paroxetine (Brisdelle, Paxil, Pexeva); promethazine (Promethegan); quinidine (in Nuedexta); rifampin (Rifadin, Rimactane, in Rifamate, in Rifater); sedatives; sertraline (Zoloft); sleeping pills; tranquilizers; and venlafaxine (Effexor XR). Your doctor may need to change the doses of your medications or monitor you carefully for side effects. Many other medications may also interact with haloperidol, so be sure to tell your doctor about all the medications you are taking, even those that do not appear on this list.
tell your doctor if you have Parkinson's disease (PD; a disorder of the nervous system that causes difficulties with movement, muscle control, and balance). Your doctor will probably tell you not to receive haloperidol injection.
tell your doctor if you have a low number of white blood cells. Also tell your doctor if you have or have ever had QT prolongation (an irregular heart rhythm that can lead to fainting, loss of consciousness, seizures, or sudden death); bipolar disorder (condition that causes episodes of depression, episodes of mania, and other abnormal moods); trouble keeping your balance; an abnormal electroencephalogram (EEG; a test that records electrical activity in the brain); seizures; an irregular heartbeat; low levels of potassium or magnesium in your blood; or heart or thyroid disease.
tell your doctor if you are pregnant, especially if you are in the last few months of your pregnancy, or if you plan to become pregnant or are breastfeeding. If you become pregnant while receiving haloperidol, call your doctor. Haloperidol may cause problems in newborns following delivery if it is given during the last months of pregnancy.
if you are having surgery, including dental surgery, tell the doctor or dentist that you are receiving haloperidol injection.
you should know that receiving haloperidol injection or haloperidol extended-release injection may make you drowsy and may affect your ability to think clearly, make decisions, and react quickly. Do not drive a car or operate machinery after you receive haloperidol injection or haloperidol extended-release injection until you know how this medication affects you.
you should know that alcohol can add to the drowsiness caused by this medication. Do not drink alcohol during your treatment with haloperidol.
you should know that haloperidol injection may cause dizziness, lightheadedness, and fainting when you get up too quickly from a lying position. To avoid this problem, get out of bed slowly, resting your feet on the floor for a few minutes before standing up.