Generic sildenafil can be prescribed without restriction on the NHS.

 

The following drugs for the treatment of erectile dysfunction -Alprostadil, Avanafil, Tadalafil, Vardenafil, Viagra are not prescribable on an NHS prescription unless the prescription is endorsed "SLS" for men who: • Have diabetes, multiple sclerosis, Parkinson's disease, poliomyelitis, prostate cancer, severe pelvic injury, single-gene neurological disease (for example Huntington's disease), spina bifida, or spinal cord injury.

• Are receiving renal dialysis for renal failure.

• Have had radical pelvic surgery, prostatectomy (including transurethral resection of the prostrate), or a kidney transplant.

• Were receiving Caverject®, Erecnos®, MUSE®, Uprima®, Viagra®, Cialis®, or Viridal®at the expense of the NHS on 14 September 1998.