Its a bit short notice but I would recommend that you get a letter from your GP and also take enough medication for the duration of your holiday unless of course the medication can be bought over in Ibiza cheaper than here. I would also contact your tour operator or travel agent and double check with them about what you have to take with you.

I don't know if it is the same in Ibiza as it is in Turkey, but if they are prescription medicines and in the original packaging, then there should not be a problem. If they are long term medications, then take your prescription re-order form with you. You should have no problems. Have a great holiday.