Tramadol is probably available. Don't believe it has a "circle" on the pack, and the reports on codeine based products and somas are certainly verified.
Prescription only drugs are marked with an empty circle (heart pills, anti-depressants, antifungals, warfarin and that shit- usually exactly that, Rx only); a half black half white circle (ritalin, ketamine, strong benzos- heard of spaniards getting them off local chemists they know personally but no chance for El Touristo) or a full circle (your morph/meth/oxycont' shit, needs plenty of paperwork, no chance for anyone without a script or a loaded .45- Spain is not Mexico despite sharing a language)