The Common Anticholinergic Drugs In Your Medicine Cabinet Linked to Increased Cardiovascular Disease Risk

The medications filling your medicine cabinet may be quietly undermining your heart. A broad class of drugs known as anticholinergics — found in everyday treatments for allergies, depression, bladder problems, motion sickness, and sleep disorders — block acetylcholine, a chemical messenger your nervous system uses to keep your heart rhythm steady, your blood pressure stable, and your digestion moving.

When those signals are suppressed for years, your heart loses one of its most important stabilizers — the system that keeps it calm when your body is under stress. Many people don’t realize how common these medications are, or that taking more than one at a time compounds the effect.

The most common brands of anticholinergic medications are found across several drug classes, often under specific brand names, including:

• First-Generation Antihistamines (often used for sleep or allergies) include Benadryl (diphenhydramine), Unisom (doxylamine), Dramamine (dimenhydrinate), and Vistaril (hydroxyzine).
• Antispasmodics (used for gastrointestinal issues) include Bentyl (dicyclomine), Levsin (hyoscyamine), Transderm Scop (scopolamine), and Librax (clidinium/chlordiazepoxide).
• Antimuscarinics (used for overactive bladder) include Oxytrol (oxybutynin), Vesicare (solifenacin), Detrol (tolterodine), and Toviaz (fesoterodine).
• Other Common Brands include Cogentin (benztropine, for Parkinson’s), Robaxin (methocarbamol, muscle relaxant), and Paxil (paroxetine, an antidepressant).
  Many OTC sleep aids (like Tylenol PM) and anti-nausea medications (like Gravol) also contain strong anticholinergic ingredients like diphenhydramine.

Two large population studies that were recently published show, however, that the cardiovascular consequences of this cumulative drug burden are serious and follow a clear pattern: the more exposure you accumulate, the greater your risk of heart failure, arrhythmias, heart attacks, and strokes.

Once scientists began analyzing long-term medication exposure across hundreds of thousands of people, the link between anticholinergic drugs and heart disease became impossible to ignore. The first major study offers a clear picture of how this drug burden translates into measurable heart risk over time.

The key points and conclusions from these studies are as follows:

• Common medications with anticholinergic effects — including certain allergy drugs, sleep aids, and antidepressants — interfere with acetylcholine, a chemical your nervous system uses to regulate heart rhythm, blood pressure, and other automatic body functions
• A large study following 508,273 adults for about 14 years found that higher use of these medications was linked to significantly greater risk of cardiovascular problems such as heart failure, abnormal heart rhythms, heart attacks, and strokes
• Researchers observed a clear dose-response pattern: the more frequently these medications were used, the higher the risk of heart disease, with the highest exposure group showing roughly a 71% increase in cardiovascular events
• A separate long-term study tracking 21,636 adults found that people taking several anticholinergic medications had increased risk of developing cardiovascular disease and significantly higher death rates compared with those who took none
• Reducing reliance on anticholinergic medications and supporting metabolic health may help lower the drug burden on your heart and nervous system; further research is needed to confirm whether these lifestyle changes directly reduce cardiovascular risk

You can read Dr.Mercola’s full article on this on his excellent substack at: https://articles.mercola.com/sites/articles/archive/2026/05/14/anticholinergic-drugs-cardiovascular-disease.aspx

Other sources include:
https://link.springer.com/article/10.1186/s12916-026-04751-w
https://jamanetwork.com/journals/jamainternalmedicine/fullarticle/2736353