You don’t need a prescription to make a dangerous medication mistake.
That’s the part most families don’t realize. Over-the-counter (OTC) medications feel safe. They’re on grocery store shelves, they don’t require a doctor’s visit, and we’ve been using them our whole lives.
But in my 20+ years as a licensed pharmacist, some of the most serious medication errors I’ve seen happened with products anyone can buy without a prescription.
The good news: these mistakes are entirely preventable.
Here are common OTC medication errors families make, and what to do instead.
Mistake #1: Using a Kitchen Spoon to Measure Liquid Medication
This one is so common that I considered it its own public health issue.
A kitchen teaspoon is not a medical measurement tool.
Depending on the spoon, it can hold anywhere from 3 to 7 milliliters of liquid. But when a medication label says “give 1 teaspoon,” it means exactly 5 mL every single time.
That gap matters. For a child’s pain reliever or fever reducer, consistently under-dosing means the medication may not work. Over-dosing, even slightly, can tip a small child into unsafe territory faster than you’d expect.
What to do instead:
Always use the dosing device that comes packaged with the medication. Usually an oral syringe or a calibrated cup. If it’s missing, ask your pharmacist for an oral syringe.
They’re free, and your pharmacist will be glad you asked. This single habit change eliminates one of the most common sources of pediatric medication error at home.
Mistake #2: Accidentally Double-Dosing on Acetaminophen
This is the mistake that worries me most, because it’s so easy to make and the consequences can be serious.
Acetaminophen, the active ingredient in Tylenol, is one of the most widely used medications in the world.
It’s also hiding in dozens of combination products: cold and flu medicines, nighttime pain relievers, cough syrups, allergy medications, and prescription combination drugs.
Here’s the scenario I’ve seen play out too many times: a parent gives their child a nighttime cold medicine before bed, then wakes up at 2 a.m. to a child with a fever and gives them a dose of children’s Tylenol on top of it.
Both products contain acetaminophen.
Now the child has received a double dose, possibly more than the safe daily limit, without anyone realizing it. Then the cycle repeats for a few more days.
The same risk applies to adults managing multiple symptoms with multiple products simultaneously.
What to do instead:
Before giving any OTC medication, read the “Active Ingredients” section on every label, not just the front of the box.
If acetaminophen appears in more than one product you’re considering, choose only one at a time.
When in doubt, call your pharmacist before combining any two medications.
Mistake #3: Stopping Antibiotics Early Because “We Feel Better”
Antibiotics are prescription medications, but in some States the Pharmacist is permitted to assess their patients and prescribe certain ones so here we go.
This mistake is worth including because it’s one of the most widespread medication errors in family health and the consequences extend beyond your household.
When an antibiotic prescription is for 10 days, it’s 10 days for a reason. The first few days eliminate the weakest bacteria, which is why symptoms improve quickly.
The remaining doses target the hardier bacteria that are still present. Stop early, and those surviving bacteria don’t just linger. They can multiply, return stronger, and in some cases develop resistance to that antibiotic.
Antibiotic resistance is one of the most serious public health threats we face globally. Every course of antibiotics that isn’t completed contributes to it.
What to do instead:
Finish the full course, even when everyone feels completely fine. If side effects are making it difficult to continue, call your prescriber or pharmacist, don’t just stop. There are often alternatives!
Mistake #4: Assuming “Children’s” Means Safe in Any Amount
The word “children’s” on a label tells you the product was formulated for a younger patient. It does not mean it’s harmless in any quantity or that it’s appropriate for every child.
Many OTC children’s medications are dosed by weight, not age alone. Two children who are both seven years old can have very different ideal doses if one weighs 45 pounds and the other weighs 70. Using the age bracket on the label without accounting for weight is a common source of under- and over-dosing.
Additionally, children under certain ages, often under 2, sometimes under 4 or 6 depending on the product, should not receive many OTC medications at all without a doctor’s guidance.
In other words, “Children’s” doesn’t always mean “for all children.”
What to do instead:
Always dose by weight when the label provides weight-based guidance. When your child falls between weight categories, ask your pharmacist which dose is appropriate.
And for children under 2, contact your pediatrician before giving any OTC medication.
Mistake #5: Ignoring Expiration Dates and Storing Medications in the Bathroom
The medicine cabinet in the bathroom is one of the most common places families store medications and unfortunately one of the worst.
Heat and humidity from showers and baths degrade medications faster than most people realize, sometimes well before the printed expiration date.
Speaking of expiration dates: they’re not bureaucratic suggestions.
They represent the manufacturer’s tested guarantee that the medication is both stable and effective up to that point.
Beyond that date, potency decreases. Meaning your fever reducer may not actually reduce fever. And in rare cases, chemical changes can cause harm.
What to do instead:
Store medications in a cool, dry location such as a bedroom dresser drawer, a hall closet shelf, or a dedicated box on a high shelf in a room that doesn’t experience temperature and humidity swings.
Check expiration dates twice a year (a good habit to pair with changing smoke detector batteries).
Dispose of expired medications properly through an FDA take-back program or follow FDA disposal guidelines, don’t just toss them in the trash or flush them down the drain.
The Simplest Safety Net You’re Not Using Enough
After 20 years behind the pharmacy counter, here is the piece of advice I give every family: use your pharmacist.
Pharmacists are the most accessible healthcare professionals in the country. No appointment. No copay for a quick question. We are specifically trained in drug interactions, dosing, and medication safety and we want to help.
Before you combine two medications, before you give something to a very young child, before you assume a product is safe because it doesn’t require a prescription — ask.
That conversation takes two minutes and can prevent real harm.
Want to go deeper on medication safety with your family? Visit my Medication Safety: The Ultimate Guide for age-appropriate skills, home safety systems, and resources for every stage. And if you’re a homeschooling family looking to build genuine health science literacy, explore my medication safety classes designed specifically for homeschoolers.
Disclaimer: This content is for general educational purposes only and does not constitute medical advice. Always consult a licensed healthcare provider for guidance specific to your family’s health needs.