Ketotifen is an antihistamine medication used in the eyes and orally to treat symptoms that often accompany allergies. Drugs.com explains that an antihistamine blocks the body's release of histamine, a chemical responsible for producing allergy symptoms such as sneezing, runny nose and watery eyes. This medicine is available by prescription only and has minimal side effects when used as directed.
Eye Irritation
The most common side effects of Ketotifen occur during and shortly following the application of the drops. These are considered to be mild and include redness, burning, stinging and irritation of the eye. Individuals who experience a worsening of eye allergy symptoms, such as increased itching, should contact a doctor right away, according to Drugs.com. Other less common eye irritations include dryness and dilated pupils.
Vision Changes
Some individuals may experience a mild change in vision, such as blurring or cloudiness from the application of the solution. This will resolve after several seconds or minutes as the solution works its way over the eye. Drugs.com warns individuals to contact a doctor if any other vision changes occur, as these are not considered to be normal.
Photosensitivity
Ketotifen drops can increase an individual's sensitivity to light, also called photosensitivity. Drugs.com explains that this is a mild side effect and not considered to be a reason to discontinue the medication.
Infection
If the eye becomes infected when using Ketotifen drops, it is important to seek medical treatment. Signs of infection include redness, drainage, swelling of the eyelid and unusual discharge, according to Drugs.com.
Nervous System Changes
MayoClinic.com states that children and some adults may experience nervous system changes with the use of Ketotifen taken orally. These uncommon side effects include dizziness, drowsiness, reduced alertness, irritability, nervousness, excitability and trouble sleeping.
Head Discomfort
Headaches, runny nose or nasal congestion are some of the most common side effects of Ketotifen, according to eMedTV.com. These occur in between 10 and 25 percent of individuals using the medication.
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