Professional Formulas Rehydration Drops offers homeopathic support for dehydration effects such as dry mouth, dry skin, or increased thirst. Recommended Use: Place drops under tongue 30 minutes before/after meals. Adults and children 12 years and over: Take 10 drops up to 3 times ...Professional Formulas Rehydration Drops offers homeopathic support for dehydration effects such as dry mouth, dry skin, or increased thirst.