5 Medication Mistakes People Make at Home (And How to Avoid Them)

After more than 20 years in pharmacy practice, I have seen the same mistakes show up again and again. Not because people are careless — but because nobody told them.

Consider this your briefing.

Mistake #1: Taking two products with the same active ingredient.

This is the one that concerns me most. Acetaminophen (the active ingredient in Tylenol) is hiding in hundreds of products — NyQuil, DayQuil, Theraflu, Excedrin, and countless others. Taking two of these at the same time can push you well above the safe daily limit without realizing it.

What to do instead: Before taking any OTC product, read the Drug Facts label and check the active ingredients list. If acetaminophen appears in more than one product you're using, stop and ask a pharmacist before combining them.

Mistake #2: Using nasal decongestant spray for more than three days.

Nasal sprays like Afrin work fast and feel like a miracle — but using them beyond three consecutive days causes rebound congestion (called rhinitis medicamentosa). Your nose becomes more stuffed when you stop than it was before you started. If you've been using one for a week and feel like you can't stop, that's exactly why.

What to do instead: Limit nasal spray decongestants to three consecutive days maximum. If you're already caught in the rebound cycle, talk to your pharmacist about how to taper off safely.

Mistake #3: Not telling your doctor or pharmacist about OTC medications.

OTC doesn't mean risk-free. Ibuprofen affects kidney function and blood pressure. Decongestants raise heart rate. Certain antihistamines interact with psychiatric medications. When your provider asks what medications you take, OTC products, vitamins, and supplements belong on that list — every single one.

What to do instead: Keep a running list of everything you take — prescription, OTC, vitamins, and supplements. Share it at every appointment. Your pharmacist can review it for interactions at any time, no appointment needed.

Mistake #4: Using medications past their expiration date.

Expiration dates are not suggestions. Most medications begin to degrade after their expiration date — meaning you may not be getting the dose the label says you are. Some, like certain antibiotics, can actually become harmful over time.

What to do instead: Do a medicine cabinet audit twice a year and dispose of expired products properly. Visit FDA.gov for safe disposal options and drop-box locations near you.

Mistake #5: Giving children a smaller dose of an adult product.

This is never safe. Children are not small adults — their bodies process medications differently, and some adult formulations contain ingredients that are not appropriate for children at any dose.

What to do instead: Always use products specifically formulated for your child's age and weight, with a proper measuring device — never a kitchen spoon. For children under four, most OTC cough and cold medications are not recommended at all. When in doubt, call your pharmacist before giving anything.