At present, the following healthcare professionals can prescribe an unlicensed medicine: doctors; dentists; independent nurse and pharmacist prescribers and, in some circumstances, supplementary prescribers (who can be a pharmacist, nurse, midwife, community nurse, optometrist, physiotherapist, radiographer, or chiropodist/podiatrist). In addition to these health professional groups, the following can prescribe a licensed medicine off-label: nurse independent prescribers, pharmacist independent prescribers, and optometrist independent prescribers. However, all healthcare professionals who can prescribe as outlined above are subject to: their individual clinical competence; the professional codes and ethics of their statutory bodies; and the prescribing policies of their employers.
The responsibility that falls on healthcare professionals when prescribing an unlicensed medicine or a medicine off-label may be greater than when prescribing a licensed medicine within the terms of its licence. Prescribers should pay particular attention to the risks associated with using unlicensed medicines or using a licensed medicine off-label. These risks may include: adverse reactions; product quality; or discrepant product information or labelling (eg, absence of information for some unlicensed medicines, information in a foreign language for unlicensed imports, and potential confusion for patients or carers when the Patient Information Leaflet is inconsistent with a medicine’s off-label use).
So I think it would be ok as long as his/her training was adequate and they where covered by the above conditions I would have no problem with it.