Haldol is generally part of a long-term treatment plan. Once symptoms have been eased by taking tablets daily, long-acting injections can help keep those symptoms at bay by providing a slow release of the drug. While haloperidol can be an effective treatment, it also carries the risk of significant side effects. If you or a loved one is taking haloperidol, you should be aware of these potential side effects, some of which are medical emergencies.
Common Side Effects
Approximately 70% of people taking haloperidol will have at least one adverse effect. This is roughly double the number of people who experience adverse side effects when taking low-potency antipsychotics such as chlorpromazine, thioridazine, and levomepromazine. Some of the most common side effects of haloperidol include:
Involuntary movementsTremorsMuscle stiffnessDrowsiness or sleepinessSlow movementsConstipationDry mouth or excessive salivary secretions
When compared to other antipsychotic medications, haloperidol carries the greatest risk of neurological effects. These effects often appear within a few hours but can show up any time within the first five days of beginning or increasing the dosage of this drug. Let your healthcare provider know if you experience these side effects and they become particularly bothersome. Your provider may lower the dosage of Haldol to minimize these effects, prescribe an additional medication to provide relief, or switch you to another antipsychotic drug.
Tardive Dyskinesia
Haloperidol can cause a movement disorder called tardive dyskinesia, affecting an estimated 24% to 32% of people taking this medication. This disorder is thought to occur due to increased brain sensitivity to the neurotransmitter dopamine. Signs of tardive dyskinesia include fine, worm-like movements of the tongue or other uncontrolled movements of the mouth, tongue, cheeks, jaw, or arms and legs. These symptoms may not go away after you stop taking the drug. If this is a concern, you may wish to go over alternative medications that are available for your condition. Based on your options, your healthcare provider can help determine which ones have a side effect profile that would be more tolerable for you.
Serious Side Effects of Haloperidol
Some Haldol side effects are rare and more serious. Potentially serious side effects of haloperidol include:
Blurry vision Loss of menstruation in females Breast milk production Loss of sex drive or sexual dysfunction in males Body temperature regulation issues
Case studies have also suggested that taking haloperidol may result in facial edema, itchy skin lesions, and abdominal pain. If you develop any of these serious side effects after taking Haldol, contact your healthcare provider immediately to discuss your options.
Emergency Side Effects
There are also a few side effects that, if experienced, should prompt you or your loved one to stop taking haloperidol and seek immediate medical attention as they can be life-threatening. Emergency side effects include:
Irregular heartbeatConfusionFeverExtreme muscle stiffnessSweating
Allergic Reactions
In addition to haloperidol’s side effects, it’s also possible to be allergic to this drug. Signs of a drug allergy include skin rash or hives, itching, swelling of the lips and tongue, and difficulty breathing. If an allergic reaction is suspected, seek immediate medical attention.
Taking Haloperidol Safely
If you are prescribed haloperidol, taking it safely involves using it as directed, as well as being aware of its precautions and interactions with other drugs.
Use as Directed
When taking haloperidol in pill or oral solution form, it is usually prescribed to be taken two or three times per day. Haloperidol injections are administered by a healthcare provider and are generally given every three to four weeks. Take oral haloperidol around the same time each day. Also, don’t take more or less than prescribed. If you miss a dose, take it as soon as you remember—unless it’s close to the time for your next dose, in which case you should skip it and continue with your normal schedule.
Precautions
Haloperidol has not been deemed safe for certain populations. This includes:
People with Parkinson’s disease People who are pregnant or breastfeeding. Older adults with dementia
If you have any of these conditions, talk with your healthcare provider before taking Haldol to make sure this medication is safe for you.
Interactions
Haloperidol may interact with other medications, either blocking or enhancing their effects or, in some cases, increasing your risk of developing other health issues (such as heart problems). Medications that may potentially interact with haloperidol include:
AntiarrhythmicsBlood pressure medicinesMedications for Parkinson’s diseaseOther antipsychotics
This drug can also be affected by some drugs, causing its levels to increase or decrease. Let your healthcare provider know if you are taking any other medications, vitamins, or supplements to help avoid any possible interactions.
Side Effects of Withdrawal
When discontinuing haloperidol, you may experience withdrawal. Withdrawal symptoms can begin within the first one to two days of stopping the drug and last up to two weeks, if not longer, and include:
AgitationAnxietyDecreased libidoDepressionDizzinessHeadachesIncreased heart rateInsomniaNausea or vomitingSweatingTremorsTrouble concentrating
If you experience any of these side effects of haloperidol withdrawal, notify your healthcare provider immediately.
Signs of Overdose
Symptoms of a haloperidol overdose, which can occur from taking too much of this drug or through drug interaction, include:
JerkingSevere breathing difficultySevere dizzinessSevere drowsinessSevere muscle tremblingSevere, unusual tiredness or weaknessStiffness or uncontrolled movements
If you experience any of these symptoms, seek emergency medical assistance.
