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Parkinson’s Drugs Show Promise in Improving Alzheimer’s Symptoms, New Study Reveals

Drug Discovery & Therapeutics Neuroscience
Parkinson’s Drugs Show Promise in Improving Alzheimer’s Symptoms, New Study Reveals

For years, Alzheimer’s disease (AD) has remained a formidable challenge for patients, families, and researchers. One of the most heartbreaking realities for many is the phrase: “There is no cure.” Although several new treatments have emerged over the past few decades, options that tangibly improve memory and cognitive function in daily life remain limited.

But now, a groundbreaking study published in the prestigious journal Alzheimer’s & Dementia has captured scientific and public attention: Drugs commonly used to treat Parkinson’s disease may also improve cognitive function in people with Alzheimer’s. This discovery not only blurs the traditional boundaries between neurodegenerative disease treatments, but it also opens exciting new pathways for Alzheimer’s therapy.


Two Diseases, One Target?
Alzheimer’s and Parkinson’s are two distinct disorders—AD is best known for memory loss, while PD is characterized by movement difficulties. Yet they share a common thread: both are neurodegenerative diseases.

  • Alzheimer’s research has largely focused on amyloid plaques and tau tangles in the brain. Treatments often aim to boost the neurotransmitter acetylcholine.
  • Parkinson’s is mainly caused by the loss of dopamine-producing neurons in the brain’s substantia nigra, leading to tremors and stiffness. Treatment typically involves restoring dopamine function.

The new study highlights that Alzheimer’s patients also show neuron loss in the substantia nigra—the same region primarily affected in Parkinson’s. This area produces dopamine, a chemical essential not only for movement but also for learning,  attention, and motivation.
In other words, Alzheimer’s may involve a dopamine deficiency that has long been overlooked. To explore this possibility, researchers conducted a systematic review and meta-analysis of clinical trials from 1980 to 2023: 

  • 19 randomized controlled trials were included
  • 1,408 Alzheimer’s patients participated
  • Interventions included MAO-B inhibitors (e.g., selegiline, rasagiline), dopamine  receptor agonists, and reuptake inhibitors
  • Outcomes were measured using standard cognitive and memory tests

Key Findings: Dopamine Drugs Show Real Benefits
The results were clear: Dopamine-targeting drugs produced small but significant cognitive improvements in Alzheimer’s patients.


1. Overall Cognitive Improvement

Patients receiving dopamine drugs showed better cognitive outcomes than those on placebo. On the MMSE scale (30-point test), drug groups improved by 0.8–1.2 points on average. This modest gain can make a meaningful difference in helping patients remember what they ate or where they put their keys, preserving bits of independence.

2. MAO-B Inhibitors Stand Out

Among the drugs tested, MAO-B inhibitors showed the strongest effect—nearing a “moderate” level of improvement. These drugs work by preventing dopamine breakdown, thereby raising its levels in the brain. In contrast, dopamine reuptake inhibitors did not show significant benefits, suggesting that not all dopamine drugs work the same way in Alzheimer’s.

3. Memory Improved More Than Overall Cognition
Memory, the core deficit in Alzheimer’s, showed greater improvement than general cognitive function. This means patients may better recall recent events or locate everyday objects, exactly the kind of change families hope for.

4. Good Safety Profile
Most patients tolerated the drugs well. Some experienced mild side effects like insomnia, anxiety, or occasional hallucinations—similar to what is seen in Parkinson’s patients. Medical supervision is still essential.

What This Means for Patients & Families
Can You Use These Drugs Now? No—  not without doctor supervision. Using Parkinson’s drugs for Alzheimer’s is still “off-label” and requires evaluation by a neurologist.

Who Might Benefit?
Future tools like dopamine PET scans or blood biomarkers may help identify candidates. For now, these methods are still in development.

Can They Be Combined with Current Medications?
Early data suggest that MAO-B inhibitors can be used alongside cholinesterase inhibitors (e.g., donepezil) without major conflicts. However, dosage and timing must be carefully managed by a doctor.
What’s Next?
A UK team has already launched a Phase IIb clinical trial (Dopa-AD), planning to enroll 300 early-stage Alzheimer’s patients using biomarker screening. Results are expected in 2027. So far, neither the FDA nor EMA has granted MAO-B inhibitors “Breakthrough  Therapy” status for Alzheimer’s. This is not yet a standard treatment, but it is a highly
promising avenue.

 


Conclusion: A New Ray of Hope
For families clinging to hope, this research offers something tangible: a new direction rooted in science. These drugs won’t cure Alzheimer’s,  but they may help slow cognitive decline, preserve memory, and grant more moments of clarity. Every small step forward is a step toward light.

Reference:
https://alz-journals.onlinelibrary.wiley.com/doi/10.1002/trc2.70142 

214 comments

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Joshua Paul on

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Joshua Paul on

I would like to sincerely appreciate and recommend EarthCure Herbal Clinic for their care and support during my health journey. After undergoing their well-structured herbal treatment plans, I experienced remarkable improvement until a full recovery from my Parkinson’s disease. I discovered EarthCure Herbal Clinic through their website on Google at www . earthcureherbalclinic . com, and from the beginning, their approach was professional, compassionate, and reassuring. I am truly grateful for their dedication, expertise, and commitment to holistic healing, and I confidently recommend EarthCure Herbal Clinic to anyone seeking natural and effective herbal treatment.

Joshua Paul on

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Donald Davidson on

I was diagnosed with Parkinson’s disease four years ago. For over two years, I relied on Levodopa and several other medications, but unfortunately, the symptoms kept getting worse. The tremors became more noticeable, and my balance and mobility started to decline quickly. Last year, out of desperation and hope, I decided to try a herbal treatment program from NaturePath Herbal Clinic.
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Roberto on

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“I was diagnosed with Parkinson’s disease many years ago, and the symptoms:- tremors, stiffness and many other P-D symptoms were affecting my daily life. After researching natural remedies, I contacted Earth Cure Herbal Clinic at info @ earthcureherbalclinic. com that I found at w w w. earthcureherbalclinic. c o m on the net. They recommended their P-D remedies, and over time, I noticed great improvements on my P-D condition. My P-D condition has been completely reversed and cured with their natural highly effective P-D treatments, my symptoms have disappeared and cured completely, and I feel more in control now. I’m grateful for their support and continued assistance during their P-D treatment program for me, You should check them out on google if you need any alternative remedy that can help with your condition.”

Ermy Harry on

I was diagnosed with Parkinson’s disease a year ago at the age of 67. For several months I had noticed tremors in my right hand and the shaking of my right foot when I was sitting. My normally beautiful cursive writing was now small, cramped printing. And I tended to lose my balance. The neurologist had me walk down the hall and said I didn’t swing my right arm. I had never noticed! I was in denial for a while, as there is no history in my family of parents and five older siblings, but I had to accept I had classic symptoms. I was taking amantadine and carbidopa/levodopa and was about to start physical therapy to strengthen muscles. I used different supplements that didn’t work, so last July, I tried the PD-5 protocol—the best decision ever! My tremors eased, my energy returned, and I sleep soundly. I feel like a new woman, and I can walk and exercise again.  I got the PD-5 from ww w. limitlesshealthcenter. com

Donna Kravosec on

I was diagnosed 2 years ago at age 67. Symptoms were tremor in right leg, loss of handwriting ability,My normally beautiful cursive writing was now small, cramped printing and soft voice. I also had difficulty rising from a seated position and have balance issues. I started out taking only Azilect, then Mirapex, and then Sinemet. Several months ago I started falling frequently, hence the reason for Sinemet. During the summer of 2021, I was introduced to Limitless Herbs Center and their effective PD-5 herbal protocol. This protocol relieved symptoms significantly, even better than the medications I was given. After First month on treatment, my tremors mysterious stopped, had improvement walking. After I completed the treatment, all symptoms were gone. I live a more productive life. I was fortunate to have the loving support of my husband and family. I make it a point to appreciate every day! Visit their website Limitlesshealthcenter. com

Donna Kravosec on

My husband was diagnosed of Parkinsons disease 2 years ago, when he was 49. He had a stooped posture, tremors, right arm does not move and also a pulsating feeling in his body. He was placed on Senemet for 8 months and then Sifrol was introduced and replaced the Senemet, during this time span he was also diagnosed with dementia. He started having hallucinations, lost touch with reality. Suspecting it was the medication I took him off the Siferol (with the doctor’s knowledge) and started him on PD-5 natural herbal formula we ordered from AKNNI HERBAL CENTRE, his symptoms totally declined over a 3 weeks use of the AKANNI HERBAL Parkinson’s disease natural herbal formula. He is now almost 51 and doing very well, the disease is totally reversed! (Visit w w w.aknniherbscentre .com)

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