Here now - children's prescription - walgreens or walk in?

[koneko]

Hi all, looking for advice on getting a prescription for my almost 3 year old. He is prone to throat infections and unfortunately seems to have one halfway through our holiday. He was up most of last night with his usual terrible gagging cough. Usually we see his paediatrician in the UK and he often needs an antibiotic prescription to clear the infection. He hasn't had an attack of this for about 8 months but typically it would happen now! Any ideas if we can go to walgreens or Walmart pharmacy or if we'd need to find a walk in center? I've never needed anything medical when we've been before.