Prescription vs OTC: What's the Real Difference?

People assume prescription means strong and over-the-counter means mild. It is a reasonable guess and it is wrong often enough to be worth correcting. The real line is supervision. A medicine needs a prescription when using it safely depends on knowing something about the person taking it — their kidney function, what else they take, whether they are pregnant, how long they have had the symptom. If that knowledge is not needed, it can go on a shelf.

Same drug, both sides of the line

Plenty of drugs exist in both forms at different doses. Omeprazole is over the counter at 20mg for two weeks and prescription-only at 40mg for longer. The molecule did not change. The length of the course did, and with it the chance of missing something underneath the symptom.

Why the OTC aisle is not automatically safe

Paracetamol is the clearest example. It is on every shelf in the country and it is also one of the most common causes of acute liver failure, almost always by accident, almost always because it was in two products at once.

What this means for ordering online

When you upload a script, a pharmacist reads it against what else you have ordered. That check is the whole difference between a pharmacy and a warehouse.