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Products can be categorised in many ways - some can be sold and purchased without restrictions, and some - such as food products - are regulated.
Medicines included in medical formularies such as the British National Formulary (BNF) may be regulated in particular ways, in particular, some are classified in the following way:
- Pharmacy only (P) - this categorisation may no longer be used, but it used to be used for products which could only be purchased from a pharmacy.
- Prescription only medicine (PoM) - may not be purchased other than with a medical prescription.
- Controlled drugs