Don,
Sorry I am not sure, But an agreement was for one to be open in La Marina or Guardamar on red days. Best idea is to go to your local farmacia ,and they should have a note on the window stating which farmacia is open today. Failing that if it is urgent,you may have to travel to the 24 hour one in Torrievieha town,which is near Patricia Perez Hospital (clinic). Hope this is of some use.

Great .Thanks a lot.on my way

I'm sure you have this problem sorted now, but for future reference if you copy and paste this link, you will find all the farmacias in the area and what rotas they are on:
http://www.costacomunicaciones.es/farmacias/agenda_farmacias.php?id=222

Thanks , yes all sorted , but what a ordeal.