According to The NHS website, Tadalafil is only available on an NHS prescription for ED if you have a specific condition such as multiple sclerosis or a spinal cord injury, otherwise the doctor can provide a private prescription which would require full payment of the medicine.
That's a new one on me.
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These are the regulations with regard to prescribing Tadalafil on an NHS prescription.
(a) a man with erectile dysfunction who on 14 September 1998 was receiving a course of treatment under the Act, the National Health Service (Scotland) Act 1978(a) or the Health and Personal Social Services
(Northern Ireland) Order 1972(b) for this condition with any of the following drugs -Alprostadil (Caverject), (MUSE), (Viridal)Apomorphine Hydrochloride (Uprima)Moxisylyte Hydrochloride (Erecnos)Sildenafil
(Viagra)Tadalafil (Cialis)Thymoxamine Hydrochloride (Erecnos); or
b) a man who is a national of an EEA State who is entitled to treatment by virtue of Article 7(2) of Council Regulation 1612/68(c) as extended by the EEA Agreement or by virtue of any other enforceable
Community right who has erectile dysfunction and was on 14 September 1998 receiving a course of treatment under a national health insurance system of an EEA State for this condition with any of the drugs
listed in sub-paragraph (a); or
c) a man who is not a national of an EEA State but who is the member of the family of such a national who has an enforceable Community right to be treated no less favourably than the national in the provision of
medical treatment and has erectile dysfunction and was being treated for that condition on 14 September 1998 with any of the drugs listed in sub-paragraph (a); or
(d) a man who is suffering from any of the following - diabetes, multiple sclerosis, Parkinson's disease, poliomyelitis, prostate cancer, severe pelvic injury single gene neurological disease spina bifida, spinal cord
injury; or
(e) a man who is receiving treatment for renal failure by dialysis; or
(f) a man who has had the following surgery - prostatectomy radical pelvic surgery renal failure treated by transplant.
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The same regulation use to apply to Sildenafil but was removed circa 2014 although it only applies to generic versions and if a patient wants branded Viagra the same above criteria still apply. Although strangely a pharmacist may choose to supply Viagra when dispensing a prescription for generic sildenafil.
If none of those apply your GP may issue you a private prescription (but should not charge you for issuing it) and the pharmacist can dispense (cost variable)
This applies everywhere and is not a 'post code lottery'. If as some appear to be saying, their GP has issued an NHS prescription for Tadalafil then there is something amiss on the part of the GP.
The only other criteria is if the ED is causing severe distress but then it has to be prescribed initially via a Consultant.