Using a kitchen spoon to measure liquid medicines, like cough syrup, can lead to under- and overdosing.
Researchers at Cornell University asked 195 college students to pour 5 milliliters of medicine into various sizes of spoons.
Depending on the size of the spoon, students tended to pour too much or too little.
The researchers write that while these dosing errors might not be a big deal once, sick people are often self-medicating every 4-6 hours over a period of several days.
They recommend using dosage cups or syringes that come with medications.