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Parkinson’s Disease and Hallucinations

This was actually a difficult post for me to work on.  I knew the excerpt was useful but looking closely at hallucinations that Parkinson’s patients have strikes very close to home for me.  My grandfather suffered for Parkinson’s for some time before his death in 2003 and his hallucinations were one of the more challenging parts of his disease.  I hope that J. Eric Ahlskog’s book, Parkinson’s Disease Treatment Guide, For Physicians, helps many doctors find the best possible treatments for their patients.  Be sure to check out last week’s post, an excerpt from The Parkinson’s Disease Treatment Book: Partnering With Your Doctor to Get the Most From Your Medications.

Hallucinations in Parkinson’s disease (PD) are usually visual, that is, seeing things that are not there.  Auditory hallucinations do occur, but very infrequently.  Although hallucinations are common in advanced Parkinson’s disease, they may also surface in early PD after medications are introduced.  They are central clinical features in PD dementia and Dementia with Lewy Bodies (DLB), but drug-induced hallucinations may occur without dementia.

Hallucinations often manifest as people or animals.  For example, seeing strangers out the window, children in the yard, or animals in the house is common.  In the mildest form, this may simply be a nondescript shape out of the corner of the eye, or bugs crawling.  Insight varies, and some people recognize the absurdity of their illusions, whereas others may try to interact with the illusory phenomena.

Hallucinations in PD may be very episodic and often not tied to any provocative factor.  In view of this lack of predictability, PD patients with hallucinations must be told not to drive; they should resume driving only when cleared by the physician who must be satisfied that the hallucinations have completely resolved… hallucinations can usually be controlled with medication simplification and sometimes with additional drug therapy.

Rapid eye movement (REM) sleep behavior may be mistaken for nocturnal hallucinations and must be distinguished.  This had entirely different implications and treatment…

…In most cases, PD drugs play a prominent role in the provocation of hallucinations and delusions.  However, they are not the sole cause; the PD neurodegenerative process predisposes and they may occur even among patients not taking any drugs.  Regardless, the initial theraputic focus is on potentially culpable drugs.

In clinical trials enrolling previously untreated PD patients, dopamine agonists were 2-3 times more likely to induce hallucinations than carbidopa/levodopa monotherapy.  This may relate to the fact that pramipexole, ropinirole, and rotigotine all have selectivity for D3 dopamine receptors.  D3 receptors are primarily localized to the emotional/behavioral circuits of the limbic system.

Adjunctive PD drug therapy, in general, substantially increases the risk of hallucinations/ delusions.  Certainly, carbidopa/levodopa does occasionally provoke hallucinations, but once any adjuctive drug is added, the risks markedly escalate.  This includes not only dopamine agonists, but also monoamine oxidase-B (MAO-B) inhibitors (selegiline, rasagiline) as well as the catechol-O-methyltransferase (COMT) inhibitors (entacapone, tolcapone).

This propensity to provoke hallucinations and delusions is not confined to dopaminergic PD drugs.  The glutamate N- methyl-D-aspartate (NMDA) antagonist, amantadine, may also provoke hallucinations, as may the pharmacologically similar Alzheimer’s drug, memantine. Also, the anticholinergic PD medications, trihexyphenidyl and benztropine, are notorious for not only impairing memory, but also occasionally causing psychosis.  Certain of the urologic anticholinergic drugs may similarly exacerate hallucinations, especially hyoscyamine (Cystospaz, Levsin) and oxybutynin (Ditropan) and less frequently tolterodine (Detrol).  Darifenacin, solifenacin, and trospium appear to have only marginal potential for this problem.

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12 Responses to “Parkinson’s Disease and Hallucinations”
  1. Frances Calhoun says:

    my husband has been having hallucinations and he has parkinson’s disease. Is there a medication that he can take to control these hullucinations ? If you have experienced these please email me.

    Thanks

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  3. isobel kerr says:

    my mum has parkinsons and has been seeing dead relatives an d small dogs and children

  4. Peter Draper says:

    I was diagnosed 2005, and on 1gm levodopa (madopar – 200mg x 5) during the day. At night I often – while awake – hear a rustling and then feel an animal (maybe a cat – we have cats) crawling across the bed. It’s a bit scary. Turning on the lights makes it stop. My neurologist has prescribed Seroquel 25 mg, but it makes me so groggy that although I don’t wake up, my next day is like being in a sleep vice. no good. Better to put up with the hallucinations!

  5. JOHN MELLA says:

    PD diagnnosis since 2004. Beeen taking levo-dopa since. Recently, strong hallucinations. Simply elikminating the one pill prescribed at bedtime completly banished the halucinations. (I take 2 on rising, and 2 at 2 pm.)

  6. Lorna says:

    My 87-year-old father has Parkinsons and has
    recently been admitted to a nursing home. He is being treated with carbidopa. Although he was never paranoid, combative or aggressive at home, since admittance to the nursing home, he is all three. It puzzles the family, and the staff doesn’t quite know what is triggering this either. Is this likely the disease process? The sudden change in environment (he had been at his home for the past 20 years), or a change in the dosage?

  7. Marines says:

    John, did you mean eliminating the levodopa prescribed at bedtime? how are you doing 8 months later?

  8. Chrissy says:

    My 70 year old mother was diagnosed with PD in 1995. Over the last couple of years she’s reported seeing flashes or illusions of people in her peripheral vision. About a year or so ago she had a scary incident of hallicinating and was told to stop taking one of her meds. This did the trick until recently when she began seeing people inside/outside of her house on a regular basis. Today one of her “friends”, as we now jokingly refer to them as, was with her all day. She said this was the first time she was actually scared. She describes the people she sees very vividly and that they are “ugly” and never speak, but just stare at her. She is very candid about these experiences and, most painfully, she is totally lucid and knows what she sees is not real. I am fearful that things are progressing quickly to a level that will not/cannot be remedied. Am I right? Don’t know what to do to help. Thanks.

  9. Shiley says:

    John, which medication are you on for the PD? Is it Sinimet? My husband has had PD since 1993. He was taking Stalevo and did not have th hallicinations until we changed to the Sinimet. They did not start immediately, now they are very annoying to me.

  10. steve massey says:

    my father is 78 and has had PD for about 10 years he has has hallucinations for about the last 5 years which started as incects and flies and have now progressed to evil looking people who he claims eat human flesh? at one stage he was taken into hospital because he was convinced that they were comming out of the walls and was so frightened he managed to walk almost a mile to the policve station to ask for help. He cant manage more than a dozen or more steps normally. Whilst he was in hospital they adjusted his drugs and for a short time he seems to be less bothered and saw the images less.

    He has now moved into extra care accomodation and has assistance with his drugs from carers but in the last few weeks has started seeing people in his room? its all a part of the condition we are told and there is nothing that can be done so we have to help him live with it? distracting him sometimes helps and we try to take him out as much as possible but as his condition develops this is difficult. i jusy hope it is not heredatary because i would rather go in my sleep than cope with what has happened to him. he has lost his independance and still thinks he is much younger man and is finding life frustrating. he is taking Stalevo.

  11. BRUCE says:

    my aunt has had pd for about 10 years now. she says she sees my uncle bringing another man in their house at wee hours of the night/morning. she has said she can hear them talking too. we think she is hallucinating as her comments are very off the wall for her. she is accusing my uncle of very bad things. She is very paranoid. she could never describe him but now she is giving descriptions of him. we are totally lost as to what to do here. help please

  12. Kurt says:

    I am very intrested in the hallucinations caused by PD. Seems that the cats and dogs are seeing things also. I am in the onset of PD. I have noticed small shadowey creatures about the size of a cat that are just barely out of my vision. If my cat is inbetween us she is also looking in that direction when i glimps whatever it is, when it moves. I just thought it kinda weird.

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