Hydralyte Orange Effervescent Tablets 40 PackHydralyte Effervescent Electrolyte Tablets Orange Flavoured relieves symptoms of dehydration and helps replace water and electrolytes lost due to vomiting, diarrhoea, heavy sweating, vigorous exercise and occasional hangovers. Hydralyte Effervescent Electrolyte Tablets Orange Flavoured relieves symptoms of dehydration and helps replace water and electrolytes lost due to vomiting, diarrhoea, heavy sweating, vigorous exercise and occasional hangovers.