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Description
Phenylephrine eye drops are a medication used primarily to dilate the pupil (mydriasis) during eye examinations or surgical procedures. They belong to the class of sympathomimetic agents.
The mechanism of action involves stimulating alpha-1 adrenergic receptors in the eye, causing the muscles in the iris to contract and the pupil to enlarge. This effect helps eye care professionals examine the interior structures of the eye more easily.
Phenylephrine eye drops are typically available in various concentrations, commonly 2.5% or 10%, in liquid eye drop form. The dosage and concentration used depend on the specific purpose and patient condition, often administered as one or two drops in the affected eye(s) with frequency determined by the healthcare provider.
Common side effects can include mild eye irritation, redness, increased eye pressure, or blurred vision. Phenylephrine eye drops should not be used in patients with certain conditions such as narrow-angle glaucoma without medical supervision, as pupil dilation can worsen the condition.
They may interact with other medications, particularly those affecting blood pressure or heart function, so medical advice is important before use.
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