Allergex Eye Drops Side Effects

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Allergex is available as both tablets and as eye drops in some formulations. Although standard Allergex tablets contain chlorpheniramine and have their own side effects[4], when people refer to Allergex eye drops, they usually mean antihistamine (such as ketotifen) or decongestant (such as tetrahydrozoline) eye drops used for allergic eye symptoms. The side effects outlined below are based on these ingredients.

Common side effects of Allergex eye drops (ketotifen or tetrahydrozoline-based):

  • Eye irritation, burning, or stinging[1][2][3]
  • Blurry vision[1]
  • Headache[1][2]
  • Runny nose (ketotifen)[2]
  • Unpleasant taste in the mouth[3]

Serious side effects (less common, seek medical attention if they occur):

  • Allergic reactions (swelling of face, lips, mouth, tongue, or throat, trouble breathing, rash, hives, severe itching)[1][2][3]
  • Racing heart or irregular heartbeats[1]
  • Severe dizziness, fainting[1]
  • Nausea or vomiting[1]
  • Blurred or cloudy vision that doesn’t improve (possible increased eye pressure or cataract, especially with corticosteroid eye drops)[3]
  • Pain in the eye (possible ulcer or serious side effect)[3]

Special warnings:

  • Do not use eye drops meant for allergic or red eyes orally. Swallowing even small quantities can cause serious symptoms in children and adults, such as sleepiness, slow heart rate, low blood pressure, difficulty breathing, and life-threatening heart rhythm abnormalities[5][6].
  • If you wear soft contact lenses, wait at least 10 minutes after using antihistamine eye drops before reinserting your lenses[2].
  • Do not use for irritation due to contact lenses unless directed by your doctor[2].

References

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