Can you get drunk off Pimms?
Then, how alcoholic is Pimms?
Pimm's No. Based on gin, its base as bottled is 25 percent alcohol by volume. can also be purchased as a pre-mixed fortified lemonade (Pimm's & Lemonade) in 250 ml cans or 1-litre bottles, at 5.4 percent.
Subsequently, one may also ask, can you get drunk on Shandy?
It is unlikely that a shandy would get you drunk - although it must depend on how strong the beer is. So a shandy made from a beer of that strength would metabolise at between a pint and two pints an hour. So you could drink shandy of that strength at a pint an hour and never get drunk.
Pimms is bottled at 25% alcohol by volume, IIRC. It'll be fine, it really won't 'go bad'. The worst that will happen, if you keep it years and years is that the colour might fade a bit, and the flavours might slightly alter.