Tetrahydrozoline belongs to a class of drugs known as sympathomimetic amines. It works by temporarily narrowing the blood vessels in the eye.
Tetrahydrozoline belongs to a class of drugs known as sympathomimetic amines. It works by temporarily narrowing the blood vessels in the eye.
Relief of redness in the eyes caused by minor eye irritations (e.g., smog, swimming, dust, or smoke).
To use the eye drops, follow these steps:
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Stinging/redness in the eye, widened pupils, or blurred vision may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly.
If your doctor has directed you to use this medication, remember that he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.
Tell your doctor right away if any of these unlikely but serious side effects occur: shakiness (tremor), fast/pounding/ irregular heartbeat, headache, sweating, weakness, nervousness.
Stop using this medication and tell your doctor right away if any of these rare but very serious side effects occur: eye pain, worsening redness/itching/swelling in or around the eyes, other vision problems.
A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.
This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.
Precautions
Before using tetrahydrozoline, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients (such as preservatives like benzalkonium chloride), which can cause allergic reactions or other problems. Talk to your pharmacist for more details.
Before using this medication, tell your doctor or pharmacist your medical history, especially of: glaucoma, heart problems (e.g., heart attack, chest pain), high blood pressure, diabetes, eye infection/injury, overactive thyroid (hyperthyroidism).
This drug may cause temporary blurred vision after you apply it. Do not drive, use machinery, or do any activity that requires clear vision until you are sure you can perform such activities safely.
Caution is advised when using this product in children because they may be more sensitive to the effects of the product, especially eye irritation.
During pregnancy, this medication should be used only when clearly needed. Discuss the risks and benefits with your doctor.
It is not known whether this drug passes into breast milk. Consult your doctor before breast-feeding.
Interactions
If you are using this product under your doctor’s direction, your doctor or pharmacist may already be aware of possible drug interactions and may be monitoring you for them. Do not start, stop, or change the dosage of any medicine before checking with your doctor or pharmacist first.
Before using this medication, tell your doctor or pharmacist of all prescription and nonprescription/herbal products you may use, especially of: MAO inhibitors (linezolid, methylene blue, moclobemide, phenelzine, procarbazine, rasagiline, selegiline, isocarboxazid, tranylcypromine), guanethidine, tricyclic antidepressants (e.g., amitriptyline).
This document does not contain all possible interactions. Therefore, before using this product, tell your doctor or pharmacist of all the products you use. Keep a list of all your medications with you, and share the list with your doctor and pharmacist.
This medicine may be harmful if swallowed. If someone has overdosed and has serious symptoms such as passing out or trouble breathing, bring the patient to the nearest hospital. Symptoms of overdose may include drowsiness, severe sweating, decreased body temperature, slow/shallow breathing.
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