No expert on this as I don't suffer, but a friend does. I buy the normal ones for him over the counter here for a quarter of the UK prescription price, or he does when he visits. However the steroid?? ones, which you can buy as well without prescription are about €60 so better to get in the UK. If needed a lot, best to bring with you just in case and if you can top up cheaper here all the better. While on the subject Spanish medicines such as Salvacolina (Imodium) or Ibuprofen are better than the Uk versions and all the Farmacia are very efficient and helpful, in my experience anyway.