As the hay fever season hits the UK, millions of individuals are turning to familiar allergy medications to alleviate symptoms like sneezing, itchy eyes, and runny noses. However, concerns have been raised by experts regarding a commonly used medication and its potential association with a serious long-term health issue.
The medication in question is Benadryl, a widely available antihistamine found in pharmacies and supermarkets. While many people use it safely for short-term relief, studies suggest that extended use of certain ingredients may be linked to a notably higher risk of dementia in the future.
According to the NHS, antihistamines such as Benadryl are commonly used to manage allergies, insect bites, and hay fever symptoms. Some varieties may also induce drowsiness, along with side effects like dry mouth, dizziness, and difficulty concentrating.
The focus of concern revolves around older-style antihistamines containing anticholinergic drugs, which function by obstructing acetylcholine — a neurotransmitter associated with memory and learning.
Benadryl products in the US typically contain diphenhydramine, while certain UK Benadryl products contain acrivastine or cetirizine, depending on the formulation.
Research highlighted by Harvard Health revealed that individuals using potent anticholinergic drugs for three years or more faced a 54% higher risk of dementia compared to those using them for three months or less. The study, published in JAMA Internal Medicine, examined nearly 3,500 adults aged 65 and above.
Harvard Health explained that diphenhydramine, found in some Benadryl products, is one of the anticholinergic medications tied to the heightened risk. Researchers emphasized that the results indicated an association rather than definitive proof of direct causation between the medications and dementia.
The NHS points out that older individuals may be more vulnerable to antihistamines and their side effects, such as confusion or drowsiness. Health advice also warns that some antihistamines can interact with other drugs or exacerbate specific medical conditions like glaucoma and urinary retention issues.
Another report by Harvard Health suggested that anticholinergic drugs might impact the brain by impeding signals crucial for cognition and memory. Experts added that using multiple anticholinergic medications simultaneously could further elevate the risk.
The Alzheimer’s Society stated that additional research is required to fully comprehend the connection between anticholinergic drugs and dementia. It recommends individuals worried about medication side effects to consult with a GP or pharmacist before making any alterations.
Health professionals stress the importance of not abruptly discontinuing prescribed medications without medical advice. Those in need of regular allergy relief are encouraged to explore newer non-drowsy antihistamines or alternative treatments with healthcare providers.
