GRAYS 0.05% EYE DROPS

Indications

• Temporary relief of redness and irritation in the eyes
• Ocular hyperemia
• Minor eye irritations

Dosage

Children: Refer to specific product guidelines or consult a healthcare professional for dosing instructions, especially for children under 6 years of age.

Adults: Refer to specific product guidelines or consult a healthcare professional for dosing instructions, as formulations may vary.

Mechanism of action

Tetrahydrozoline acts primarily as an alpha-adrenergic agonist. It selectively stimulates alpha-1 adrenergic receptors located on the smooth muscle of blood vessels, leading to vasoconstriction. This reduction in blood flow results in decreased redness and swelling in the ocular tissues.

Pharmacodynamics

By activating alpha-1 adrenergic receptors, tetrahydrozoline induces vasoconstriction, which effectively reduces ocular hyperemia (redness) and relieves symptoms of eye irritation. The onset of action is rapid, with effects typically observed within minutes of administration. The duration of action can vary but generally lasts for a few hours.

Pharmacokinetics

Tetrahydrozoline is administered topically, which limits systemic absorption. Following ocular application, its pharmacokinetics are characterized by minimal systemic circulation, reducing the likelihood of systemic side effects. The drug is metabolized in the liver and excreted primarily in the urine, with a half-life that is not well-defined due to its localized use and rapid clearance.

Contra-indications

• Hypersensitivity to tetrahydrozoline or any of its components
• Narrow-angle glaucoma
• Severe hypertension
• Cardiovascular disease

Adverse effects

• Local irritation or stinging at the application site
• Rebound congestion with prolonged use
• Increased blood pressure
• Tachycardia
• Headache
• Dizziness

Interactions

• Monoamine oxidase inhibitors (MAOIs) may increase the hypertensive effect
• Other sympathomimetics may potentiate cardiovascular side effects

Precautions

• Use with caution in patients with hypertension, diabetes, hyperthyroidism, or cardiovascular disorders
• Avoid prolonged use to prevent rebound congestion
• Not recommended for use in children under 6 years of age without medical advice

Pregnancy

Limited data on safety. Use only if the potential benefit justifies the risk to the fetus.

Breast-feeding

Not known whether excreted in human milk. Use with caution and consider potential risks.

Storage

Store at room temperature, away from light and moisture. Keep out of reach of children.

Formulations

• Ophthalmic solution for eye redness
• Nasal decongestant spray