Fenistil Drops is an antihistamine medication containing dimethindene maleate used to treat various allergic conditions. The 20ml oral solution provides relief from allergic symptoms affecting the skin and respiratory system. The active ingredient dimethindene maleate works by blocking histamine, which causes allergic reactions. The drops can be used for conditions like hives, itching, hay fever, and allergic rhinitis. Dosage varies by age - adults and children over 12 years typically take 20-40 drops 3 times daily, while children under 12 have age-specific lower doses. Not recommended for infants under 1 month of age. The drops come in a 20ml amber glass bottle with a dropper for precise dosing.