Enables the transfer of a solute or solutes from one side of a membrane to the other according to the reaction: iodide(out) + Na+(out) = iodide(in) + Na+(in).
Synonyms:
xref:
Reactome:R-HSA-5658195 "Defective SLC5A5 does not cotransport Na+ with I- from extracellular region to cytosol"; reactome:R-HSA-429591 "SLC5A5 cotransports Na+ with I- from extracellular region to cytosol"