Dementia is the UK's biggest killer, claiming more lives than heart attacks and strokes combined. Despite years of exhaustive research costing millions, viagra 72 science has failed to find a cure or drug to prevent it.

Last year, data on a new drug - donanemab - suggested it could delay the worsening of symptoms in early Alzheimer's, while a similar drug, lecanemab, was almost as effective.

But serious side-effects - a third of patients on donanemab suffered brain bleeds - and the prohibitive cost of £60,000 for an 18-month course meant neither was approved for the NHS.

Now, though, there are fresh hopes for existing, cheaper and readily available drugs, such as aspirin, statins and even the weight-loss jab Ozempic.