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Any food / drug / toiletry / cosmetic can be prescibed theoretically unless listed in Part XVIIIA of drug tariff.
If on blacklist can't dispense on NHS unless generic name isn't on list.
Examples
Propecia - Finasteride for male patturn baldness
Regaine - Minoxidil for male patturn baldness
Calpol - can give PCM suspension

Part XVIIIB
items that can be prescibed for some people - must be endorsed 'SLS'
Examples
Niferex Paed - Iron drops for prems
Sidenafil - OK if pre 1998 or specific conditions - DM, PD, polio, MS, prostate ca, pelvic injury, spina bifida, single gene neuro disease, spinal cord injru, renal failure on dialysis or post transplant, prostatectomy, radical pelvic surgery