Short answer
In the United States, an over-the-counter (OTC) drug is available without a prescription; a prescription drug requires one. The distinction concerns access, not a comparative score for safety or effectiveness: FDA describes nonprescription drugs as suitable for safe and effective use without healthcare-provider supervision. 1 2
On this page
At a glance
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| Attribute | Over-the-counter drug | Prescription drug |
|---|---|---|
| Prescription needed? | No | Yes |
| Access described by FDA | Off-the-shelf in stores | Pharmacy, with a prescription |
| Use context | Without provider supervision | Prescribed for one person |
| Regulatory picture in these excerpts | Drug application or OTC monograph | NDA process in FDA’s 2017 comparison |
This summarizes US federal FDA descriptions, not a complete dispensing-rule checklist. 1 2
What each thing is
Both categories contain drugs—substances intended for purposes including diagnosing, treating, or preventing disease. “Nonprescription” is another name for OTC, not a third category. FDA’s OTC examples include sunscreens, antacids, fever reducers, and cough and cold medications, showing that the category spans different uses. 1 2
Key differences
The defining difference is whether access requires a prescription. FDA’s comparison also describes prescription drugs as intended for the person for whom they were prescribed. For OTC drugs, FDA emphasizes use without healthcare-provider supervision. These descriptions distinguish access and use context; they do not compare the effectiveness of two particular products. 1 2
How to tell them apart
The practical identification question is: does this particular product require a prescription? Store location alone is a weaker clue because FDA defines OTC status by the absence of a prescription requirement. FDA also identifies a standard information label for nonprescription products. These excerpts do not resolve every product-specific or state-level access condition. 1 2
Where they overlap
The categories overlap in being medicines subject to FDA regulation. Drug applications are not exclusive to prescription marketing: FDA identifies both an application pathway and a monograph pathway for nonprescription drugs. Thus, “OTC” does not mean that a product necessarily bypassed an individual drug application. 1 2
Edge cases
Status can change, and a change need not be complete. FDA references both full and partial switches from prescription to nonprescription marketing. That makes a product-specific distinction important: a switch announcement alone does not establish that every related product is now OTC. The excerpt does not explain the boundaries of particular partial switches. 2
Why the distinction exists
The access distinction separates medicines available without provider supervision from medicines obtained through prescribing. The regulatory framework also changes over time: the federal CARES Act, signed March 27, 2020, modernized regulation of certain OTC drugs. FDA’s 2017 comparison therefore should not stand alone as an account of today’s monograph procedures. 1 2
Common misconceptions
“OTC means unregulated” is incorrect: FDA describes two nonprescription marketing pathways. “Prescription means more effective” is not established by these sources; they distinguish access rather than rank products. Likewise, FDA’s statement about safe OTC use without supervision is not a claim that every use of every OTC medicine is safe. 2
Examples
Hypothetical case one: an antacid is offered without a prescription. It fits the OTC access category; antacids are among FDA’s nonprescription examples. Hypothetical case two: a medicine is prescribed for a named person and obtained at a pharmacy. It fits FDA’s prescription description. Neither scenario alone establishes which medicine is safer or more effective. 1 2