What Is a Prescription Drug and How Is It Different From Over-the-Counter Medicine?

A prescription drug is a medication that can only be dispensed with authorization from a licensed prescriber, such as a physician, nurse practitioner, or dentist. The key difference from over-the-counter (OTC) medicine is legal and clinical: prescription drugs require a licensed professional's order because they carry higher risks, need individualized dosing, or must be monitored. OTC medicines are sold without that authorization because they are generally considered safe for self-directed use when label directions are followed. If you want to look up a specific drug's uses, side effects, or interactions, RxList maintains a searchable index of prescription drug information.

What makes a drug "prescription-only"

A drug is placed in the prescription category through a regulatory review process, not by the manufacturer's preference. Regulators weigh factors such as:

Risk of harm without supervision — the drug can cause serious effects if used incorrectly or by the wrong patient.
Need for a diagnosis — the condition it treats must be identified by a professional before treatment.
Dosing complexity — the dose depends on weight, lab results, age, or other drugs the person takes.
Monitoring requirements — blood tests or follow-up visits are needed to catch problems early.
Abuse or dependence potential — the drug needs tighter control over who can obtain it.

When a drug's risk profile changes, its status can change too. Some drugs have moved from prescription to OTC once long-term safety data supported wider use, while others remain prescription-only indefinitely.

Prescription vs. over-the-counter: a side-by-side comparison

Dimension	Prescription drug	Over-the-counter medicine
How you get it	Authorized by a licensed prescriber, then dispensed by a pharmacy	Bought directly off the shelf
Who decides the dose	Prescriber, based on your diagnosis and history	You, following the label
Typical risk level	Higher; may need monitoring	Lower for general self-care
Labeling	Professional labeling plus a patient information leaflet	Consumer-friendly Drug Facts label
Interaction risk	Often significant; must be checked against your other medicines	Usually lower, but still possible
Examples from RxList's index	Lisinopril, metformin, sertraline	Not listed as prescription entries

The table shows the general pattern, not an absolute rule. An OTC drug can still interact with a prescription one, and a prescription drug can be low-risk for many people. The category tells you who authorizes access, not how "strong" a drug is.

Why a licensed prescriber is required

A prescriber does more than sign a form. They:

Confirm the diagnosis the drug is meant to treat.
Check your history for conditions that make the drug unsafe.
Review your other medications for interactions.
Set the dose and schedule for your situation.
Arrange follow-up to see whether the drug is working and whether side effects appear.

This is why the same drug can be appropriate for one person and contraindicated for another. A contraindication is a specific situation in which the drug should not be used. RxList's drug entries include contraindications alongside uses and side effects, which is one reason the site is organized around individual drug pages rather than a single general guide.

How to read prescription drug information

When you look up a drug, four sections answer most practical questions:

Uses — what condition the drug treats and how it is thought to work.
Side effects — common effects, serious effects, and which ones need medical attention.
Interactions — other drugs, supplements, foods, or conditions that change how the drug behaves.
Contraindications and warnings — situations where the drug should not be used or needs extra caution.

RxList groups its content this way and also offers an Interaction Checker and a Pill Identifier, so you can check a combination of drugs or identify an unknown tablet by its imprint, shape, and color. The Drugs A-Z list and the "Drugs by Classification" view let you browse by name or by drug family.

A worked example

Suppose you are prescribed Norvasc (amlodipine besylate), one of the drugs listed among RxList's trending searches. A useful lookup sequence would be:

Open the Norvasc entry to read its uses and dosing information.
Check the side effects section for what to expect and what to report.
Run your full medication list through the Interaction Checker.
Read the warnings for conditions that require caution.

The expected result is a short list of questions for your prescriber or pharmacist — not a self-directed decision to start, stop, or change a dose.

Safety steps that apply to any prescription

Follow the dosing instructions exactly as written on the label and explained by your prescriber.
Check for interactions before adding anything new, including OTC drugs, vitamins, and herbal supplements.
Use one pharmacy when possible so the pharmacist has a complete record.
Ask before crushing, splitting, or skipping doses — some forms are designed to release slowly.
Report unexpected effects rather than waiting for a scheduled visit.
Store and dispose of medicines as directed, and keep them out of reach of children.

Where to look things up

RxList organizes prescription drug information into several entry points:

Drugs A-Z List — browse alphabetically by drug name.
Drugs by Classification — browse by drug family.
Drugs Comparison — compare options within a category.
Interaction Checker — check combinations for potential problems.
Pill Identifier — identify a pill from its physical features.
Newly Published — recently added drug entries, such as Lisraya (brepocitinib) and Rasonque (daraxonrasib).

Use these resources to prepare questions and understand your treatment. They support, but do not replace, the judgment of your prescriber and pharmacist.