OTC Drugs & the Rx-to-OTC Switch

OTC Drugs & the Rx-to-OTC Switch

1. Definitions & terminology

• Over-the-counter (OTC) / non-prescription drug — a medicine that can be legally purchased and used by the consumer without a prescription from a registered medical practitioner, for self-recognised, self-limiting or chronic-stable conditions, by reading the label alone. The defining legal feature is the absence of a "prescription-only" restriction, not a positively-listed property [FDA].
• Prescription drug / "legend drug" / prescription-only medicine (POM) — a drug whose label bears the legend "Rx — to be sold by retail on the prescription of a registered medical practitioner only"; safe use requires a practitioner's diagnosis, supervision and monitoring [CDSCO].
• A chemical or biological agent is a "legal drug" only if approved by a national regulatory agency (e.g. US-FDA, EMA, India's CDSCO); approval status — not chemistry alone — confers drug status (G&G 14e Ch.1, p.1).
• Rx-to-OTC switch (reclassification / "switch") — the regulatory process by which a drug (or a particular dose, indication, pack size or route) previously available only on prescription is reclassified for non-prescription sale [FDA].
• Self-medication — use of medicines by individuals to treat self-recognised disorders or symptoms; OTC drugs are the lawful tool of responsible self-medication [WHO].
• Behind-the-counter (BTC) / pharmacist-only / "Schedule P3" or UK "P" class — an intermediate tier sold without a prescription but only by/under a pharmacist's supervision (e.g. emergency contraception in many countries) — a middle ground between POM and free OTC sale [MHRA].
• ⚠ Terminology caution — "non-prescription" is the regulator's preferred term; "OTC" is the commercial/colloquial term. In India both are used loosely because no statutory definition of "OTC" exists (see §4) [CDSCO].