Effervescent Tablets OrangeHydralyte 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. Dehydration due to: Vomiting & diarrhoea. Heat. Travel. Vigorous exercise. Heavy sweating. Occasional hangover. Heat & excessive exercise at work. Signs of mild dehydrationSticky or dry mouth, increased thirst, lethargy,