So around seven men per 1,000 in Camden and Islington are receiving Viagra, compared with three per 1,000 in Northamptonshire. Kensington and Chelsea Health Authority spends £1,331 per 1,000 per men, enough for five to have Viagra. Lambeth, Southwark and Lewisham spends £1,746 (six) and East London and the City £1,565.