When news broke in 2015 linking diphenhydramine to an increased risk of dementia, it sparked widespread alarm - and understandably so.
Diphenhydramine has been used as a common over-the-counter antihistamine and sedative across the world. You may have taken it without even realising.
As more families face a dementia diagnosis, many are rethinking the medications they’ve used without a second thought.
But risk factors are one thing. Being aware of the tools to manage medications and support your memory can better help you stay in control of your future and present health.
💡 In this article you'll discover:
- What the research says about diphenhydramine use
- 4 key strategies to limit your risk
- Tools to help you manage medications and stay safer
Diphenhydramine & Dementia Risk
What does the research reveal?
Diphenhydramine, also known under the brand name Benadryl, belongs to a group of drugs called anticholinergics. These block acetylcholine, a brain chemical vital for memory and attention.
This blocking effect is partly why anticholinergics make you drowsy and are affective for issues like insomnia. But long-term use may come with a concerning cost.
Since 2015, several studies have explored this connection. One of the most cited, published in JAMA followed nearly 3,500 people aged 65 years old and over for several years.
👉 What did the 2015 JAMA study find?
- Participants who had a higher cumulative use of anticholinergic medications (like diphenhydramine) had a significantly increased risk of both all-cause dementia and Alzheimer’s disease.
- Higher dosages and durations increased risk: “Taking an anticholinergic for the equivalent of three years or more was associated with a 54% higher dementia risk than taking the same dose for three months or less.”
While the evidence is strong, there is no 100% guarantee that anticholinergics cause dementia. Other factors, such as pre-existing health conditions, lifestyle factors, and the use of multiple medications, can complicate the picture.
Still, it’s worth being informed.
How Can You Reduce Your Diphenhydramine Risk?
Fortunately, today there are many strategies you can use to reduce the risks associated with diphenhydramine and find safer alternatives.
1. Monitor Closely & Limit Long-Term Use
Avoid using diphenhydramine (and similar anticholinergics) daily for extended periods.
If you rely on it for sleep or allergy control, ask your GP for alternatives. Treat it like a prescription that needs regular review.
💡 Follow the “Start Low, Go Slow” principle:
If short-term use is necessary, take the lowest effective dose for the shortest duration. Then reassess with your doctor.
2. Try Safer Alternatives
Second‑generation antihistamines like loratadine (Claritin) or fexofenadine (Allegra) do not penetrate the blood-brain barrier as easily and may be safer as longer-term medications.
3. Review All Medications Regularly
Diphenhydramine may hide behind cold, allergy, or sleep remedies. Instead of relying on brand names, check the ingredients carefully or ask a medical professional for help.
Even if you feel well, it’s wise to periodically review all your medications. Carefully gather and bring them to your GP or pharmacist who can assess their combined "anticholinergic load".
The Anticholinergic Cognitive Burden (ACB) scale ranks medications by their cognitive risk. Experts recommend avoiding drugs with an ACB score of 3 or higher.
👉 Worried about missed doses or mix-ups? See: How to manage your medications at home
4. Opt For Non‑Drug Strategies
If sleep is the issue, build a calming evening routine: light exercise, dim lighting, no screens, or gentle meditation.
Allergies? Try saline rinses, HEPA air purifiers, or reducing your exposure to triggers like pollen, dust mites, or mould.
✅ Managing Medications With Elli Cares
Wish there was a safer and easier way to manage your medications or those of a loved one?
With the Elli Cares app it only takes seconds to:
- Safely keep a record of regular medications in one place
- Set clear, timely reminders so doses aren’t missed or forgotten
Move from reacting to problems to planning ahead. When you’re making decisions about medications, it’s reassuring to have a clear view of what’s working and what’s not.
👉 Learn more at: How Elli Cares Reminders Help Manage Tasks, Appointments & Medications
Keep Informed, Stay Proactive
If you're concerned about the links between diphenhydramine and dementia, you’re not alone.
But here’s the good news: Knowing this can help you make safer choices - now, and in the future. There are safer alternatives and non-drug strategies that can support your comfort, sleep, and wellbeing without putting your health at risk.
✅ With the Elli Cares app, you can keep better track of medications and feel more confident in the choices you make for yourself or a loved one.
Staying curious, informed, and proactive is one of the most powerful steps you can take for lifelong wellbeing.
👉 Discover more on how Elli Cares can support you at www.elliapp.co
Disclaimer: No content in this article, regardless of date, should be used as a substitute for direct medical advice from your doctor or other qualified clinician.
Key References:
Gray, S. L., Anderson, M. L., Dublin, S., Hanlon, J. T., Hubbard, R., Walker, R., ... & Larson, E. B. (2015). Cumulative use of strong anticholinergics and incident dementia: a prospective cohort study. JAMA internal medicine, 175(3), 401-407.
