how long can you keep antibiotics and use?

[spikeycat]

Ds2 (10mnths) was prescribed antibiotics a few weeks ago but I was told not to use them for a few days (to see how he went), however, dp did open the bottle.

It is still in the fridge and ds1 is pulling his ear, has a raging temp etc - Can I use the antibiotics in the fridge? Will they still be safe? By the way, I can't get a docs apt for him, ta

Have to used within 7 days of them being made up. In the past we have been given the powder and water separate so that we can make them up ourselves. (DD has been on them for long periods at a time)

Bugger!